Investigation of charge transfer between donor and acceptor for small-molecule organic solar cells by scanning tunneling microscopy and ultrafast transient absorption spectroscopy  

作　　者：Yuchuan Xiao Linxiu Cheng Xinyu Sui Qi Wang Jie Chen Dan Deng Jianqi Zhang Xuan Peng Xiaokang Li Xunwen Xiao Ke Deng Xinfeng Liu Zhixiang Wei Qingdao Zeng 

机构地区：[1]CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology(NCNST),Beijing 100190,China [2]Jiangxi Provincial Key Laboratory of Low-Carbon Solid Waste Recycling,School of Geography and Environmental Engineering,Gannan Normal University,Ganzhou 341000,China [3]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China [4]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [5]College of Chemistry and Chemical Engineering,Gannan Normal University,Ganzhou 341000,China [6]School of Materials and Chemical Engineering,Ningbo University of Technology,Ningbo 315211,China

出　　处：《Nano Research》2022年第9期8019-8027,共9页纳米研究（英文版）

基　　金：the National Basic Research Program of China(Nos.2017YFA0205000 and 2016YFA0200700);the National Natural Science Foundation of China(Nos.21773041,21972031,21301092,and 20962002);the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB36000000).

摘　　要：Small-molecule organic solar cell is a category of clean energy potential device since charge transfers between donor and acceptor.The morphologies,co-assembly behavior,interaction sites,and charge transfer of BTID-nF(n=1,2)/PC71BM donor-acceptor system in the active layer of organic solar cell have been studied employing scanning tunneling microscopy(STM),scanning tunneling spectroscopy(STS),density functional theory(DFT)calculations,and transient absorption(TA)spectroscopy.The results show that BTID-1F and BTID-2F form bright strip structures,whereas BTID-nF(n=1,2)/PC71BM form ridge-like structures with each complex composed of one BTID-nF(n=1,2)molecule and four PC71BM molecules which adsorbed around the BTID-nF(n=1,2)molecule by S···πinteraction.With the assistance of S···πinteraction between BTID-nF(n=1,2)and PC71BM,BTID-nF(n=1,2)/PC71BM co-assembled ridge-like structures are more stable than the BTID-nF(n=1,2)ridge structures.To investigate the charge transfer of BTID-nF(n=1,2)/PC71BM system,STS measurements,DFT calculation,and TA spectroscopy are further performed.The results show that charge transfer occurs in BTID-nF(n=1,2)/PC71BM system with the electron transferring from BTID-nF(n=1,2)molecules to PC71BM.

关 键 词：organic solar cells scanning tunneling microscopy transient absorption spectroscopy charge transfer donor-acceptor system 

分 类 号：O64[理学—物理化学]