Fine-Tuning Contact via Complexation for High-Performance Organic Solar Cells

作     者：Yawen Li Zhenzhen Zhang Xiaona Han Tao Li Yuze Lin 

作者机构：Beijing National Laboratory for Molecular SciencesCAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of SciencesBeijing 100049 Center for Spintronics and Quantum SystemsState Key Laboratory for Mechanical Behavior of MaterialsDepartment of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anShaanxi 710049 

出 版 物：《CCS Chemistry》 (中国化学会会刊（英文）)

年 卷 期：2022年第4卷第3期

页      面：1087-1097页

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：The authors thank the National Key R&D Program of China(no.2018YFB0407601) the National Natural Science Foundation of China(no.51802250) the Key R&D Program of Shanxi(no.2019TSLGY08),and Chinese Academy of Sciences 

主　　题：organic solar cells interface cathode contact complexation work function 

摘      要：For organic optoelectronic devices,precise tuning of the electrical property of both active layers and interfaces is crucial to achieve enhanced device ***,we developed a facile method using complexation to modify the work function and energy levels of cathode contact layers in organic solar cells(OSCs)to achieve suitable work function and energy levels while retaining relatively good *** with the control devices with neat(N,Ndimethyl-ammonium N-oxide)propyl perylene diimide(PDINO)contacts,the tris(pentafluorophenyl)borane(BCF)-complexed PDINO cathode contacts showed enhanced power conversion efficiencies(PCEs),which is independent of the composition of the active *** specifically,single-junction OSCs employing PDINO cathode contact with 2 wt%BCF-additive achieved an average PCE of 17.7%.Based on experimental data and theoretical modeling,we found that the boron cores of BCF coordinate with the amino N-oxide terminal substituent of PDINO after generating BCF–H2O/methanol *** segments with a strong electron-withdrawing property can effectively reduce the energy levels of the PDINO–BCF complex,and thus enhance device PCE when it is used as a cathode contact in *** strategy can be extended to other types of photovoltaic devices,photodetectors,and light-emitting diodes.