The Potential Game-Changer:A Concept-to-Proof Study on D:A Heterojunction-Free Organic Photovoltaics

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外文摘要：Since 1986,the donor-acceptor(D:A)heterojunction has been regarded a necessity for high-efficiency organic photovoltaics(OPVs),due to its unique advantage in compensating the intrinsic limitations of organic semiconductors,such as high exciton binding energy and poor ambipolar charge mobility.While this adversely causes tremendous non-radiative charge recombination and instability is-sues,which currently become the most critical limits for commercialization of OPVs.Here,we present a concept-to-proof study on the potential of D:A heterojunction free OPV by taking advantage of recent progress of non-fullerene acceptors.First,we demonstrate that the"free carriers"can be spontaneously generated upon illumination in an NFA,i.e.,the 6TIC-4F single layer.Second,the 6TIC-4F layer also exhibits good ambipolar charge transporting property.These exceptional characteristics distinguish it from the traditional organic semiconductors,and relieve it from the reliance of D:A heterojunction to independently work as active layer.As a result,the subsequent OPV by simply sandwiching the 6TIC-4F layer between the cathode and anode yields a considerably high power conver-sion efficiency～1％.Moreover,we find the D:A heterojunction free device exhibits two order of magnitude higher electrolumines-cence quantum efficiency and significantly reduced Voc loss by 0.16 eV compared to those of the D:A BHJ structure,validating its promise for higher efficiency in the future.Therefore,our work demonstrates the possibility of using D:A heterojunction-free device structure for high performance,that can potentially become the next game changer of OPV.

外文关键词：

Organic solar cellsSpontaneous charge generationAmbipolar charge transportCharge recombinationPerovskite-like organic semiconductorSchottky-junction structureSingle component

作者：

Lijian Zuo、Sae Byeok Jo、Xueliang Shi、Francis Lin、Alex Jen

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作者单位：

State Key Laboratory of Silicon and Advanced Semiconductor Materials,MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China

Department of Materials Science and Engineering,University of Washington,Seattle,WA,USA

School of Chemical Engineering,Sungkyunkwan University(SKKU),Suwon 16419,Republic of Korea

School of Chemistry and Molecular Engineering,East China Normal University,Shanghai 200062,China

Department of Materials Science and Engineering,City University of Hong Kong,Kowloon,Hong Kong,China

Department of Chemistry,City University of Hong Kong,Kowloon,Hong Kong,China

Hong Kong Institute for Clean Energy,Hong Kong,China

Department of Materials Science and Engineerin

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基金：

国家重点研发计划国家自然科学基金国家自然科学基金中央高校基本科研业务费专项中央高校基本科研业务费专项research startup fund from Zhejiang University

项目编号：

2022YFB42006005217318552127806226-2022-00133226-2022-00209

出版年：

2024

DOI：

10.1002/cjoc.202300427

中国化学(英文版)

中国化学会上海有机化学研究所

中国化学(英文版)

CSTPCD

影响因子：0.848

ISSN：1001-604X

年,卷(期)：2024.42(3)

参考文献量49