Versatile Sequential Casting Processing for Highly Efficient and Stable Binary Organic Photovoltaics

Chengliang He; Youwen Pan; Guanghao LuBaohua WuXinxin XiaChang-Qi MaZeng ChenHaiming ZhuXinhui LuWei MaLijian ZuoHongzheng Chen

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Versatile Sequential Casting Processing for Highly Efficient and Stable Binary Organic Photovoltaics

机译：Versatile Sequential Casting Processing for Highly Efficient and Stable Binary Organic Photovoltaics

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Forming an ideal bulk heterojunction (BHJ) morphology is a critical issue governingthe photon to electron process in organic solar cells (OSCs). Complementaryto the widely-used blend casting (BC) method for BHJ construction,sequential casting (SC) can also enable similar or even better morphology anddevice performance for OSCs. Here, BC and SC methods on three representativedonor:acceptor (D:A) blends are utilized, that is, PM6:PC_(71)BM, PM6:IT-4Fand PM6:L8-BO. Higher power conversion efficiencies (PCEs) in all cases bytaking advantage of beneficial morphology from SC processing are achieved,and a champion PCE of 18.86 (certified as 18.44) based on the PM6:L8-BOblend is reached, representing the record value among binary OSCs. The observationson phase separation and vertical distribution inspire the proposal ofthe swelling-intercalation phase-separation model to interpret the morphologyevolution during SC processing. Further, the vertical phase segregation is foundto deliver an improvement of device performance via affecting the chargetransport and collection processes, as evidenced by the D:A-ratio-dependentphotovoltaic properties. Besides, OSCs based on SC processing show advantageson device photostability and upscale fabrication. This work demonstratesthe versatility and efficacy of the SC method for BHJ-based OSCs.

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来源
《Advanced Materials》 |2022年第33期|2203379.1-2203379.10|共10页
作者
Chengliang He; Youwen Pan; Guanghao LuBaohua WuXinxin XiaChang-Qi MaZeng ChenHaiming ZhuXinhui LuWei MaLijian ZuoHongzheng Chen;
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作者单位

State Key Laboratory of Silicon MaterialsMOE Key Laboratory of Macromolecular Synthesis and FunctionalizationInternational Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027, P. R. China;

Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710054, P. R. China;

State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049, P. R. ChinaDepartment of PhysicsChinese University of Hong KongNew TerritoriesHong Kong 999077, P. R. Chinai-Lab & Printable Electronics Research CentreSuzhou Institute of Nano-tech and Nano-bionicsChinese Academy of SciencesSuzhou 215123, P. R. ChinaDepartment of ChemistryZhejiang University Hangzhou 310027, P. R. China;

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正文语种英语
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binary devices; bulk-heterojunctions; organic solar cells; phaseseparation; sequential casting;

Versatile Sequential Casting Processing for Highly Efficient and Stable Binary Organic Photovoltaics

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