Tag: 夜上海论坛

Allrecipes Cooks up a Newly Designed Site

first_imgMeredith revealed Allrecipes’ newly launched digital platform Tuesday. The new site has a social network-oriented focus, boosting the sharing capabilities that the 40 million monthly visitors have increasingly been using.    New features, such as “I Made It,” allow cooks to share their culinary creations with their followers. Stan Pavlovsky, Allrecipes’ president, says this transformation is different than what many social networks currently offer. “[They] spark inspiration, but lack actionable information and create fragmented conversations.” Feedback so far has been positive, according to Pavlovsky, with cooks consuming more pages per visit and increased site and community engagement with the shopping features and local offers. The announcement is “just the beginning of a rich roadmap of features we will be introducing in the months ahead,” Pavlovsky adds. Thanks to the new single site and code base that extends across devices, this will allow the Allrecipes teams to “innovate more rapidly so we can release new consumer and advertising experiences at an accelerated pace,” he says. The new site’s design and technology were created in-house, leveraging all of the brand’s resources over a nearly two-year timeframe. Pavlovsky says that they also looked to the “behaviors, suggestions and feedback from our community of 40 million home cooks,” to help inspire this latest iteration. center_img Over the past 18 months, the brand employed various feedback channels to gather information on the new experience including usability testing, user satisfaction tracking, video diaries, surveys and Web analytics data.  Swanson is one of the first brands to partner with Allrecipes on the new design, largely because “Swanson cooks are turning to digital media sources for culinary inspiration and information more than ever,” Mark Materacky, Soup & Broth Marketing Director, Campbell Soup Company, says in the release. The roll-out strategy included an initial reveal, with beta site access given to a subset of the Allrecipes community over the past year, which “allowed us to gather very rich data reflecting their response to new design elements and features,” says Pavlovsky. last_img read more

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Making The Perfect Playlist With GRAMMY U Members

first_imgFrom setting the mood to choosing the right artists, we ask college students around the country how they create their perfect playlistJennifer VelezGRAMMYs Nov 1, 2018 – 9:19 am Making the perfect playlist is an art. The mood has to be right, the songs have to flow and the name has to encapsulate it all. After all, a playlist is the soundtrack before a test, during a gym session or a on cross-country trip. Song to song, it needs to keep you in the moment.But what makes a perfect playlist? How to pick from so many artists to capture one kind of feeling? It’s clear music streaming companies have also put some thought into how to make the perfect playlist. As Spotify puts it, “Playlists are no longer just simple collections of songs. They’ve grown to become cultural epicenters, complete with their own communities.”As a group who engages with music the most, we asked some GRAMMY U members from different colleges across the country to figure out what constitutes a good playlist and how they put it all together.”Playlists are able to tell the world what collection of music defines your reality,” Chicago GRAMMY U Representative, Becca Zagorski, shares. “This becomes an artistic expression because it promotes expression through self-reflection for the creator and intrigue and discovery from the listener.”For Becca, it’s all about capturing a mood. Her “Fallish” playlist mood is a mix of pop hits and more obscure tracks that fit her theme. From Travis Scott’s “SICKO MODE” to Parquet Courts’ “Tenderness,” her playlist captures her own personal musical touch for songs with mass appeal at the time that she can eventually look back nostalgically.  “I create a playlist for each season that has songs that fit the mood of the time period combined with current popular songs,” she said. “That way when I go back and listen to those playlists, I can reminisce on the music that encapsulated that period of time in my life.”Florida GRAMMY U Rep Melanie McGrath uses artists from the past and present in her playlist, {h o w t o b e a woman}, to make a soundtrack that inspires her to be better in the present and future. Songs on her playlist include Maggie Rogers’ “Alaska,” Lorde’s “Greenlight” and girl band The Aces’ “Stuck.””It’s a playlist full of indie women artists who inspire me to be the best version of myself!” says Melanie. “Anytime I find an indie pop/folk/electronic song that makes me feel empowered as a young woman and a young songwriter, I add it.”To create her perfect playlist, GRAMMY U Rep Tristin from New Orleans, La., whose playlist includes everything from Kurt Vile’s “Pretty Pimpin” to Fleetwood Mac’s classic “Rhiannon,” envisions herself in the mood she wants to capture.”Once I got into that frame of mind, I was able to create what I feel like matched the mood and the setting of that scene, which for me is filled with folk, indie and alternative music,” Tristin says. “In order to make it more of an artistic expression, you have to really know what type of feeling you want the playlist to convey.”Whatever your goal, combining nostalgic songs with current viral favorites or bringing together specific artists before and during your time, or by focusing your thoughts on the feeling you want to create, your perfect playlist can be something that is truly only yours.Which Women Musicians Do You Think Are The Most Influential Of This Century?Read more How To Make The Perfect Playlist making-perfect-playlist-grammy-u-members News Making The Perfect Playlist With GRAMMY U Members Facebook Email Twitter last_img read more

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Google revives Huawei work temporarily after US eases restrictions

first_img Tags Google will continue to work with Huawei for now. Getty Google said Tuesday it will continue working with Huawei for 90 days, after the US government announced it’s temporarily scaling back trade restrictions on the Chinese smartphone maker.On Monday, the US Commerce Department said it’s creating a general license that for now lets Huawei keep existing networks and issue updates to its phones and tablets. The reprieve is meant to give US companies time to figure out longer-term solutions and to protect consumers from security risks. The license expires on August 19. “Keeping phones up to date and secure is in everyone’s best interests and this temporary license allows us to continue to provide software updates and security patches to existing models for the next 90 days,” a Google spokesperson said in a statement. Huawei didn’t immediately respond to a request for comment. Now playing: Watch this: Comments Huawei P30 Pro vs. Galaxy S10 Plus: Editors react Phones Share your voice 6:54 Google’s decision not to cut ties with Huawei, the second largest smartphone company in the world, is a reversal of plans it announced earlier this week after the Trump administration effectively banned Huawei from the US, restricting the company’s access to US components and software. For Google, that meant suspending some business with Huawei, a key partner for its Android mobile operating system. Google reportedly said that it would stop providing Huawei with customer support and that upcoming versions of Huawei’s phones outside China would no longer get access to Google’s Play Store app marketplace and its marquee slate of services, including YouTube and Google Maps. Huawei, though, would still have access to the open-source version of Android without Google services. It’s unclear what Google will do after the 90-day license expires. Read: Samsung has the most to gain from Google putting Huawei on ice 4 Google Huawei Alphabet Inc.last_img read more

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Indias housing mess 174 lakh homes stalled across major cities

first_imgREUTERS/Chris HelgrenSupreme Court’s recent landmark verdict on the Amrapali case has brought the limelight back to the Indian realty sector and lakhs of home buyers as numbers of incomplete and stalled housing projects continue to be on the rise creating “ghost cities” by the day.The magnitude of the country’s real estate sector’s dark reality can be gauged from the fact that around 1.74 lakh homes in 220 projects across the top seven cities in the country are completely stalled, as per the data from Anarock Property Consultants.”Launched either in 2013 or before, these projects have absolutely no construction activity going on. The overall value of all stalled units is estimated to be more than Rs 1,774 billion (Rs 1.77 lakh crore). Most of these projects have been grounded due to either liquidity issues or litigations,” the Anarock report said.Around 1.15 lakh homes, which accounts for nearly 66 per cent of the total stalled units have already been sold to buyers who have been left in the lurch, at the mercy of either the concerned developers or the law of the land. The net estimated value of these sold units is around Rs 1.11 lakh crore.As per the data, the National Capital Region (NCR) has the largest pile-up of stalled units with 1.18 lakh homes spread over 67 projects with an overall value of Rs 82,200 crore. Of this, nearly 69 per cent or 83,470 units are already sold out.Further, around 98 per cent of the stuck projects in NCR are located in Noida and Greater Noida alone, while other cities like Gurugram, Ghaziabad have minimal inventory.The other major market of Mumbai Metropolitan Region (MMR) ranked second in terms of stalled projects with 38,060 units stalled across the city. The stalled units are spread across 89 projects, compared to 67 in NCR, the data showed.Pune comes next with nearly 28 stalled projects comprising 9,650 units, followed by Hyderabad with nearly 4,150 units. Bengaluru has 26 projects comprising 3,870 stuck units.The housing distress, although spread across the country, is mostly felt and witnessed in the NCR, with Noida and Greater Noida in the lead. The cases such as Jaypee Infratech, Amrapali Group and Unitech have been under the glare, with all them being dragged to the Supreme Court.The Supreme Court has cancelled Amrapali’s RERA licence, and ordered investigation on its key officials, and has asked the state-run construction major NBCC to take over its projects. NBCC has also submitted its proposal to work as a consultant for the completion of Unitech’s projects.Jaypee Infratech, on the other hand, is going through the corporate insolvency resolution process (CIRP) and has surpassed the 270-day deadline of achieving a resolution. The National Company Law Appellate Tribunal (NCLAT) this week extended its resolution process by another 90 days.These legal issues have also hit the already-distressed homebuyers. Sanjeev Sahani, who bought a 2-BHK flat at one of Jaypee’s projects in Noida in 2011 still for the completion of his home and says that the total legal cost born by home buyers to get their rightful home has reached around Rs 2 crore by now.Sahani, who is also a member of a home buyer’s association told IANS: “The tower in which I bought the flat is not even 50 per cent built. Even if a third party takes it up, it would take another three years to complete.”last_img read more

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IndiGos poor customer care record forces parliamentary panel to flag airline

first_imgThe alleged failure of IndiGo to respond satisfactorily to customer complaints is behind a parliamentary panel’s remarks that it is the ‘worst performing’ airline for customer services.Derek O’Brien, the Trinamool Congress MP who heads the panel, reserved the sharpest criticism for the low-budget carrier in a report that he tabled in the Rajya Sabha, according to a media report.The Parliamentary Standing Committee on Transport, Tourism and Culture, Road, Shipping and Aviation said in the report that the airline was noted for poor customer services, having rude staff and higher charges during the festive season, among other issues.IndiGo, owned by InterGlobe Enterprises, however, denied it neglected customer complaints. The airline said in a statement that it evaluated complaints and feedback by the customers rigorously and the staff were given regular training to handle situations and make possible hassle-free customer experience.O’Brien said the panel was not generally happy with the way some private carriers are operating, but it was discourteous the way IndiGo was operating. He said Air India had the best luggage policy.”Our committee is very clear that the worst performing airline for consumers is IndiGo. All 30 members agreed on this. IndiGo has not respondeddespite many complaints. The way they behave with consumers and charge for just one kg or two kg overweight of air baggage…,” O’Brien said, according to a media report.He said some carriers charged eight to 10 times the normal fares during the festive season.”The airline is very rigid, IndiGo even charges for one-two kg overweight, this has not been taken very well and the committee is looking into the matter seriously,” O’Brien said.While taking note of higher fare charges, the panel suggested that the charges by the airlines should not exceed 50 per cent of the base fare and tax and airlines should refund the fuel surcharge to customers.The national carrier Air India has the best policy for luggage and other private carriers should raise the baggage limit, O’Brien said.last_img read more

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Khaleda to surrender before court Thursday

first_imgKhaleda Zia .File photoBangladesh Nationalist Party (BNP) chairperson and former prime minister Khaleda Zia is going to appear before a special court in Dhaka on Thursday, seeking bail in the Zia Charitable Trust graft case as it issued a warrant for her arrest, reports UNB.Bangladesh Nationalist Party (BNP) chairperson Khaleda Zia, who is facing arrest warrants in three cases, returned home from the UK on Wednesday afternoon after over a three-month stay there.”Our chairperson will appear before the special court set up at the playground of Government Alia Madrasa in the capital’s Bakshibazar on Thursday,” said BNP secretary general Mirza Fakhrul Islam Alamgir.He came up with the comment while talking to reporters in front of Khaleda’s Gulshan residence on Wednesday night.The BNP chief will start her journey from her residence for the court around 10:00am, said her media wing member Shamsuddin Didar.Earlier in the day, BNP standing committee member Moudud Ahmed said their chairperson returned home showing respect to the court as some warrants for her arrest were issued in different cases.He said Khaleda will surrender before the court and seek bail in the cases in which the arrest warrants were issued against her.Khaleda returned home from the UK on Wednesday afternoon after over a three-month stay there.She reached Hazrat Shahjajal International Airport by an Emirates Airlines flight around 5:08pm.Earlier on 12 October, Dhaka Special Court-5 issued the warrant for the arrest of BNP chairperson Khaleda Zia in the Zia Orphanage Trust graft case as she went to London without its permission.On 3 July 2008, the Anti-Corruption Commission filed the case with Ramna Police Station accusing Khaleda Zia, her eldest son Tarique Rahman, and four others for misappropriating over Tk 21.0 million (2.10 crore) that came as grants from a foreign bank for orphans.last_img read more

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ALs polls phobia leads to Gazipur election postponement BNP

first_imgLogo of BNPBNP secretary general Mirza Fakhrul Islam Alamgir on Sunday alleged that the government has got the Gazipur City Corporation election stayed by the court resorting to tricks sensing the sure defeat of the ruling party mayoral candidate.He came up with the observation at a press conference at BNP chairperson’s Gulshan office.”The government could realise the defeat of its candidate. That’s why they’ve got a writ filed by their party man, and stayed the Gazipur city polls,” the BNP leader said.Fakhrul said Savar upazila Awami League labour and manpower affairs secretary ABM Azharul Islam filed the writ with the High Court “at the behest of the government. This incident has once again exposed that the government has got totally isolated from people.”Earlier in the day, the High Court stayed the Gazipur City Corporation election scheduled to be held on 15 May.An HC bench of justice Naima Haider and justice Zafar Ahmed passed the order following a hearing on the writ petition.The HC also issued a rule asking the government to explain as to why the inclusion of six moujas of Dhaka district into GCC should not be declared illegal.Fakhrul said BNP considers the stay order on the Gazipur polls as a victory of the party. “The government was forced to stop the polls to avoid its sure defeat.”He strongly condemned and protested the arrest of party vice chairman Abdullah Al Noman and other party leaders and activists at Tongi, Gazipur.The BNP secretary general demanded the government immediately release those were arrested, including Noman.He said the government is getting the election stayed as it suffers from an ‘election phobia’.Fakhrul also criticised the election commission, saying it is not playing an impartial role. “Our senior leader Moudud Ahmed has already demanded that the commission be reconstituted.”He said the EC has failed to take proper steps for holding fair and credible polls. “So, we’re also worried about the national election.”BNP standing committee members Khandaker Mosharraf Hossain, Moudud Ahmed, Dr Abdul Moyeen Khan and Amir Khosru Mahmud Chowdhury were present.last_img read more

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DU student commits suicide

first_imgA student of Dhaka University (DU) allegedly committed suicide jumping off the roof of his house at Cantonment area on Wednesday night.The deceased was Mushifiq, a fourth year student of Music department of the University.”I heard that he jumped off from the rooftop of his house and committed suicide,” university Proctor professor AKM Golam Rabbani told UNB.He is a non-residential student of Bijoy Ekattar hall and his village is in Rangpur district, he added.last_img

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Quader finds BNP manifesto joke of the year

first_imgBangladesh Awami League general secretary Obaidul Quader. File PhotoDescribing BNP’s election manifesto as a colourful balloon full of unrealistic pledges, Awami League general secretary Obaidul Quader on Tuesday said it will implode immediately if the party comes to power, reports UNB.”BNP has presented some unrealistic and weird promises which can’t be fulfilled,” he said, describing the election manifesto as the best joke of the year.The AL leader came up with the remarks while talking to reporters at a restaurant by the Dhaka-Chattogram highway in Chouddagram upazila of the district.BNP rolled out its manifesto for the 11th parliamentary elections on Tuesday with a set of promises, including making democracy an everyday practice, building a vengeance -free Bangladesh and raising GDP growth to 11 percent.last_img read more

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Be a good human being to be a good physician Bhutanese PM

first_imgBhutanese prime minister Lotay Tshering with his old friends at Mymensingh Medical College on Sunday. Photo: Anowar HossainBhutanese prime minister Lotay Tshering, who was a student of Mymensingh Medical College, on Sunday said one has to be a good human being for becoming a good physician.”I’ve entered politics without discarding my uniform. I thought about the people of Bhutan and worked for them from 2013 to 2018 without doing any job and going abroad. Today, I’m the prime minister of that country,” he said.The Bhutanese prime minister was addressing a special reception accorded to him by Mymensingh Medical College at its auditorium.Going down the memory lane, Lotay Tshering said he along with his classmate and current Bhutanese foreign affairs minister Tandi Dorji stayed at room No-20 of Baghmara College Hostel in the district town from 1991 to 1999. “We’re now doing politics together. There’s no rift between us during this long period. Today, I’m the prime minister because of him. He made me the prime minister.”Bhutanese prime minister Lotay Tshering passes time with his classmates. He also exchanges greetings with them. Photo: Anowar HossainHe also underscored the need for forgetting all the differences to take the country forward.The Bhutanese prime minister turned emotional recalling various incidents of his student life at the medical college.Earlier, students of the medical college welcomed him when he arrived in Mymensingh by a helicopter.Lotay Tshering later visited the surgery ward of Mymensingh Medical College Hospital.A 28th batch student, Lotay Tshering enrolled in Mymensingh Medical College in 1991 for pursuing MBBS. On completion of the MBBS degree, he did FCPS in Dhaka.Lotay Tshering entered politics in 2013 and became the prime minister of Bhutan on 7 November last year after his party won the election.This was his first visit to Bangladesh after becoming the prime minister.last_img read more

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AL starts organisational tour to Khulna division

first_imgAwami League central leaders on Saturday started their organisational tour to Khulna division, reports UNB.During the organisational tour, the central leaders will attend eight meetings (mostly extended special meetings) in Chuadanga, Jashore, Norail, Satkhira, Khulna, Bagerhat and Jhenaidah, said a press release.With the tour, the ruling party has started its organisational visit throughout the country ahead of the AL national council to be held in October 2019.On the first day of the tour, the AL leaders will join an extended special meeting of AL Chuadanga district unit on Saturday.AL district units will arrange seven meetings, while AL Khulna city unit will organise one meeting.The AL central leaders will attend the meetings in Jashore and Narail on Sunday, Satkhira on Monday.They will also join the meetings in Khulna city on 18 May, Khulna district on 19 May, Bagerhat on 20 May and Jhenaidah on 21 May.The members of the AL central organisational team formed for Khulna division include its presidium member Pijush Kanti Bhattacharya, acting general secretary Mahbubul Alam Hanif MP, joint general secretary Abdur Rahman, organising secretary Abu Sayeed Al Mahmud Swapan, labour affairs secretary Habibur Rahman Siraj, central working committee members Monnujan Sufian, MP, SM Kamal Hossain, lawyer Amirul Islam Milon and Parvin Zaman Kalpana.last_img read more

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Nier Is Not My Name

first_imgBy Dr. Kaye Wise Whitehead, Special to the AFROI grew up learning how to hold my rage, to swallow my pain, and to stand up tall even when I felt like I had the weight of the world on my shoulders. I spent every summer in South Carolina, around women who had come of age during the days of Jim Crow and who made it a point, to teach me about the power and strength of Blackness. There were days when it was overwhelming (exhausting, really) to be Black and to have to deal with Whiteness as the standard through which everything else was measured. My grandmother despised this standard and the notions of White privilege. Her neighborhood was filled with Confederate flags and White men who dared to call her auntie. She remembers being called n—-r almost as much as she was called her name. I was seven the first time that I can remember being called a n—-r. My grandmother used that moment to teach me how to respond and say, with confidence and without bending my head, that n—-r was not my name. She made me stand in front of the mirror and say it over and over again until I could say without tears in my eyes, without looking away, and without internalizing the power of this word. She told me that some words were designed to strip black people of both our power and our voice. “White people,” she said, “need us to be their n—–s so that they can feel superior. Don’t give them that. N—-r is not your name, nor your legacy. You may not understand that today but you will and when you do, make sure you tell somebody else.”Dr. Karsonya Wise Whitehead (Courtesy Photo)I thought about my grandmother’s words while I was preparing to speak at the Maryland Lynching Memorial Project. I sat in my office watching videos and looking through photographs of Black bodies hanging from trees. I studied the faces of the White men and women who were casually standing around, talking and laughing, as Black people were being tortured and abused, cut and burned. I looked at the children and wondered who they grew up to be, after learning to normalize Black death and suffering. I listened to interviews from White people who spoke about why they had to kill that n—-r, almost as if they were doing God’s work. The n—-r to them was a nameless and faceless monster that threatened white supremacy, white nationalism, and white superiority. The n—-r, as James Baldwin once said, is an invention of White people that show their fear of Black people.According to the Equal Justice Initiative, nearly 3,959 Black men, women, and children were lynched in the twelve Southern states between 1877 and 1950 and, so far, 40 of them have been documented to have happened right here in Maryland. On that day, I wanted to speak their names and to speak for the victims that had not been identified yet. I wanted to say, loud and clear, that n—-r was not their name. I wanted to speak for those who had been terrorized; those who had been stalked; those who had been harassed; and, those who had been beaten and tortured. I wanted to speak for them because those of who are still here must not forget. We must hold the power of collective memory and teach it to others.I thought about all of this when I visited Bard High School Early College in Baltimore. I walked into the school and walked past a group of Black male students laughing and calling each the n-word. I was on my way to the office, but I decided to stop and ask them why they were using that word. Now, that was not the first time that I heard young people use the n-word, but after spending so many days immersed in lynching history, I could not just walk by. They said that it was a form of affection and that it was not a big deal. They said that everybody did it and that it was ok if you were Black.I stood there and looked at them because I wanted to tell them about the history of this word and about what James Baldwin said. I wanted to show them the lynching pictures on my phone and talk about how our blood, as Frederick Douglass once said, is mixed with the soil of this land. I wanted to challenge them to think deeply about the power of their words, but I did not know where to start. How do you collapse 400 hundred years of oppression and hatred, of white supremacy and white nationalism, lynching, and torture into five minutes? As I stood there thinking about all of this, the hallways filled up, and the students started moving toward class. One young man stayed behind because he wanted to know why I questioned them and what was the big deal with that word. I thought about my grandmother at that moment, and I smiled, because n—-r, I said, is not your name nor your legacy. You may not understand that today but you will and when you do, make sure you tell somebody else.Karsonya Wise Whitehead is the #blackmommyactivist and an associate professor of communication and African and African American studies at Loyola University Maryland. She is the host of “Today With Dr. Kaye” on WEAA 88.9 FM and the author of the forthcoming “Dispatches from Baltimore: The Birth of the Black Mommy Activist.” She lives in Baltimore City with her husband and their two sons.The opinions on this page are those of the writers and not necessarily those of the AFRO.Send letters to The Afro-American • 1531 S. Edgewood St. Baltimore, MD 21227 or fax to 1-877-570-9297 or e-mail to editor@afro.com.last_img read more

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Facebook Hires Vidpresso Team Acquires Social Video Tech

first_img Popular on Variety Facebook has hired the team behind Vidpresso, a startup focused on helping broadcasters with streaming videos to Facebook Live and other social platforms. The social media giant also acquired certain assets related to Vidpresso’s technology, and the startup is transitioning its existing live streaming clients to Facebook as it is winding down its own operations.Vidpresso announced the deal on its website Monday: “Wow. We’re really excited to share we’re joining Facebook effective today.  We will continue to help creators, publishers, and broadcasters create great live experiences, and focus on what we’re best known for: Enabling world-class interactive streams on Facebook Live.”Vidpresso first launched in 2012, and some of its clients included Cosmopolitan, NASDAQ, CNBC, NBC News and BuzzFeed. The company changed course a few times, and at one time was looking to help broadcasters integrate social elements into their traditional TV programming. More recently, Vidpresso had been focusing on social live streaming with interactive elements, with a big emphasis in Facebook Live — work the team now wants to continue from within Facebook:“By joining Facebook we’ll be able to offer our tools to a much broader audience than just our A-list publishing partners,” the company wrote on its website Monday. “Eventually, it’ll allow us to put these tools in the hands of creators, so they can focus on their content, and have it look great, without spending lots of time or money to do so.”Vidpresso’s existing live streaming customers will be transitioned to Facebook’s own tools, according to Techcrunch, which was first to report on the news Monday. There is no word on financial details of the deal; Vidpresso had raised just $120,000, according to Crunchbase. center_img ×Actors Reveal Their Favorite Disney PrincessesSeveral actors, like Daisy Ridley, Awkwafina, Jeff Goldblum and Gina Rodriguez, reveal their favorite Disney princesses. Rapunzel, Mulan, Ariel,Tiana, Sleeping Beauty and Jasmine all got some love from the Disney stars.More VideosVolume 0%Press shift question mark to access a list of keyboard shortcutsKeyboard Shortcutsplay/pauseincrease volumedecrease volumeseek forwardsseek backwardstoggle captionstoggle fullscreenmute/unmuteseek to %SPACE↑↓→←cfm0-9Next UpJennifer Lopez Shares How She Became a Mogul04:350.5x1x1.25×1.5x2xLive00:0002:1502:15last_img read more

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Solar cell mystery solved expected to greatly increase efficiency

first_img Explore further But in a new study published in Science Advances, Dong Shi et al. have taken a closer look at spiro-OMeTAD and found that it still has a great deal of untapped potential. For the first time, they have grown single crystals of the pure material, and in doing so, they have made the surprising discovery that spiro-OMeTAD’s single-crystal structure has a hole mobility that is three orders of magnitude greater than that of its thin-film form (which is currently used in solar cells). “This paper reports a major breakthrough for the fields of perovskite and solid-state dye-sensitized solar cells by finally clarifying the potential performance of the material and showing that improving the crystallinity of the hole transport layer is the key strategy for further breakthroughs in device engineering of these solar cells,” Osman Bakr, a professor of engineering at King Abdullah University of Science and Technology (KAUST) in Saudi Arabia and leader of the study, told Phys.org. The findings suggest that, at least in the short term, the time-consuming process of designing and synthesizing radically new organic hole conductors as replacements to spiro-OMeTAD may not be necessary.In general, perovskite solar cells and dye-sensitized solar cells are made of three critical layers. Two of these layers—the electron-transporting layer and the light-absorbing layer—are well-understood structurally. However, the mesoscale packing structure of the hole-transporting layer, which is usually spiro-OMeTAD, has so far eluded researchers, and consequently its charge transport mechanisms have remained a mystery.In the new study, the researchers figured out a way to grow pure single crystals of spiro-OMeTAD by dissolving the spiro-OMeTAD in a carefully chosen solvent. They then placed this vial inside a larger vial containing an antisolvent, in which spiro-OMeTAD does not dissolve as well, and allowed the antisolvent vapor to slowly diffuse into the inner vial. Eventually the solution in the inner vial becomes supersaturated, so that not all of the spiro-OMeTAD can stay dissolved, causing the spiro-OMeTAD to crystallize. The researchers then performed a variety of measurements on the crystals to investigate their charge transport mechanisms and other properties.The results are much more encouraging than expected, in many ways running contrary to the conventional wisdom based on the material’s large-scale structure, which suggested that the material had reached its limits. Although the method used here to grow single crystals cannot be performed at a large scale, the researchers predict that similar methods that use an antisolvent to trigger crystallization could be used to enhance the crystallinity of the thin-layer spiro-OMeTAD, improving its hole mobility in order to make more efficient solar cells.”These astonishing findings open a new direction for the development of perovskite solar cells and dye-sensitized solar cells by showing the still untapped potential of spiro-OMeTAD,” Bakr said. “They unravel a key mystery that has confounded the photovoltaic community for the last 17 years.” (Left) The set-up used to grow single crystals of spiro-OMeTAD, based on antisolvent vapor-assisted crystallization. (Right) Single crystal structure of spiro-OMeTAD. Credit: Shi, et al. ©2016 AAAS Pinholes be gone More information: Dong Shi, et al. “Spiro-OMeTAD single crystals: Remarkably enhanced charge-carrier transport via mesoscale ordering.” Science Advances. DOI: 10.1126/sciadv.1501491AbstractWe report the crystal structure and hole-transport mechanism in spiro-OMeTAD [2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene], the dominant hole-transporting material in perovskite and solid-state dye-sensitized solar cells. Despite spiro-OMeTAD’s paramount role in such devices, its crystal structure was unknown because of highly disordered solution-processed films; the hole-transport pathways remained ill-defined and the charge carrier mobilities were low, posing a major bottleneck for advancing cell efficiencies. We devised an antisolvent crystallization strategy to grow single crystals of spiro-OMeTAD, which allowed us to experimentally elucidate its molecular packing and transport properties. Electronic structure calculations enabled us to map spiro-OMeTAD’s intermolecular charge-hopping pathways. Promisingly, single-crystal mobilities were found to exceed their thin-film counterparts by three orders of magnitude. Our findings underscore mesoscale ordering as a key strategy to achieving breakthroughs in hole-transport material engineering of solar cells. © 2016 Phys.orgcenter_img This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Journal information: Science Advances Citation: Solar cell mystery solved, expected to greatly increase efficiency (2016, April 24) retrieved 18 August 2019 from https://phys.org/news/2016-04-solar-cell-mystery-greatly-efficiency.html (Phys.org)—For the past 17 years, spiro-OMeTAD, has been keeping a secret. Despite intense research efforts, its performance as the most commonly used hole-transporting material in perovskite and dye-sensitized solar cells has remained stagnant, creating a major bottleneck for improving solar cell efficiency. Thinking that the material has given all it has to offer, many researchers have begun investigating alternative materials to replace spiro-OMeTAD in future solar cells.last_img read more

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