首页|Understanding the Interfacial Energy Structure and Electron Extraction Process in Inverted Organic Solar Cells with Phosphine-Doped Cathode Interlayers

Understanding the Interfacial Energy Structure and Electron Extraction Process in Inverted Organic Solar Cells with Phosphine-Doped Cathode Interlayers

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Cathode interlayers(CILs)play an essential role in achieving efficient organic solar cells(OSCs).However,the electronic structure at the electrode/CIL/active layer interfaces and the underlying mechanisms for electron collection remain unclear,which becomes a ma-jor obstacle to develop high-performance CILs.Herein,we investigate the relationship of the electron collection abilities of four cross-linked and n-doped CILs(c-NDI:P0,c-NDI:P1,c-NDI:P2,c-NDI:P3)with their electronic structure of space charge region at hetero-junction interface.By accurately calculating the depletion region width according to the barrier height,doping density and permittivi-ty,we put forward that the optimal thickness of CIL should be consistent with the depletion region width to realize the minimum en-ergy loss.As a result,the depletion region width is largely reduced from 13 nm to 0.8 nm at the indium tin oxide(ITO)/c-NDI:P0 inter-face,resulting in a decent PCE of 17.7％for the corresponding inverted OSCs.

Organic solar cellsCathode interlayerDepletion region widthElectric conductivityElectron transportElectron transferElectron extraction process

Yi Yang、Jingwen Wang、Yang Xiao、Bowei Xu、Jianhui Hou

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State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

University of Chinese Academy of Sciences,Beijing 100049,China

State Key Laboratory of Chemical Resource Engineering,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China

Guangdong Major Project of Basic and Applied Basic ResearchBureau of International Cooperation Chinese Academy of SciencesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities

2019B030302007121111KYSB20200043NSFC2183500651961135103buctrc202140

2024

10.1002/cjoc.202300635

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(12)