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16.3%Efficiency binary all-polymer solar cells enabled by a novel polymer acceptor with an asymmetrical selenophene-fused backbone

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Science China Chemistry 2022年第2期65卷 309-317页

作者： Huiting Fu Qunping Fan Wei Gao Jiyeon Oh Yuxiang Li Francis Lin Feng Qi Changduk Yang Tobin J.Marks Alex K.-Y.Jen Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina Department of Chemistry City University of Hong KongKowloon 999077Hong KongChina Department of Energy Engineering School of Energy and Chemical EngineeringPerovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)50 UNIST-gilUlju-gunUlsan 44919Republic of Korea Department of Materials Science and Engineering University of WashingtonSeattleWashington 98195-2120USA Department of Chemistry and the Materials Research Center Northwestern UniversityEvanstonIL60208USA Institute for Advanced Studies City University of Hong KongKowloon 999077Hong KongChina

Despite the significant progress made recently in all-polymer solar cells(all-PSCs),it is still quite challenging to achieve high open-circuit voltage(V_(oc))and short-circuit current density(J_(sc))simultaneously in order to further improve their *** recent strategy of using selenophene to replace thiophene on the Y6 based polymer acceptors has resulted in significantly improved J_(sc)s of the resulting ***,such modifications have also depressed V_(oc),which compromises the overall performance of the ***,we present the design and synthesis of a novel polymer acceptor,PYT-1S1Se,created by inserting an asymmetrical selenophene-fused framework to precisely manipulate optical absorption and electronic *** with the selenium-free analog,PYT-2S,and symmetrical selenium-fused analog,PYT-2Se,the PYT-1S1Se derived all-PSCs not only deliver optimized J_(sc)(24.1 mA cm^(−2))and V_(oc)(0.926 V)metrics,but also exhibit a relatively low energy loss of 0.502 ***,these devices obtain a record-high power conversion efficiency(PCE)of 16.3%in binary *** work demonstrates an effective molecular design strategy for balancing the trade-off between V_(oc) and J_(sc) to achieve highefficiency all-PSCs.

关键词： all-polymer solar cells polymer acceptors asymmetrical selenophene-fused backbone power conversion efficiencies stability

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Blade-coating Perovskite Films with Diverse Compositions for Efficient Photovoltaics

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Energy & Environmental Materials 2021年第3期4卷 277-283页

作者： Jun-Xing Zhong Wu-Qiang Wu Liming Ding Dai-Bin Kuang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

In this research highlight,recent significant advances with hot-assisted blade-coating or air knife-assisted blade-coating of different perovskite compositions with bandgaps ranging from 1.3 eV to 1.9 eV(*** or small-bandgap perovskites with mixed cations and anions,2D/3D perovskites,Pb/Sn binary perovskites,and all-inorganic perovskites)for single-junction or tandem PSCs are discussed,with an emphasis on elucidating the distinct ink formulation engineering strategies,crystal growth mechanisms,crystallization kinetics,and optoelectronic properties of the different perovskite compositions.

关键词： perovskite solar cells blade-coating composition engineering bandgaps power conversion efficiencies

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A Two-Dimensional Hole-Transporting Material for High-Performance Perovskite Solar Cells with 20% Average Efficiency

A Two-Dimensional Hole-Transporting Material for High-Perfor...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Jiang-Yang Shao Yu-Wu Zhong Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of Sciences

A readily-available small molecular hole-transporting material(HTM), OMe-TATPyr, is synthesized and tested in perovskite solar cells(PSCs). OMe-TATPyr is a two-dimensional π-conjugated molecule with a pyrene core and four phenyl-thiophene bridged triarylamine groups. It can be readily synthesized in gram scale with a low lab cost of around 50 US$/g. The incorporation of the phenyl-thiophene units in OMe-TATPyr are beneficial for not only carrier transportation through improved charge delocalization and intermolecular stacking, but also potential trap passivation via Pb-S interaction as supported by depth-profiling XPS, photoluminescence, and electrochemical impedance analysis. As a result, an impressive best power conversion efficiency(PCE) of up to 20.6% and an average PCE of 20.0% with good stability has been achieved for mixed-cation PSCs with OMe-TATPyr. A large-area(1.08 cm) device based on OMe-TATPyr demonstrates a PCE of 17.3%. Together with the scalable synthesis and low cost of OMe-TATPyr, such an impressive performance makes it a new promising HTM for efficient and stable PSCs.

关键词： Perovskite Solar Cells Hole-Transporting Material power conversion efficiencies

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