Synthesis of two A-B-C type conjugated amphiphilic triblock fullerene derivatives and their application in organic solar cells  

作　　者：Jikang Liu Pengfei Jiang Yao Wang Guoli Tu 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology

出　　处：《Chinese Chemical Letters》2020年第1期119-124,共6页中国化学快报（英文版）

基　　金：financially supported by the National Key R&D Program of China (No.2018YFA0209200);the National Natural Science Foundation of China (No.21574049)

摘　　要：Two A-B-C type conjugated amphiphilic triblock fullerene derivatives C60-2 HMTPB and C60-2 EHTPB were obtained in multi steps synthesis with three different blocks,and the amphiphilic diblock molecular C60-4 TPB was also preferred as a reference.When as modifying layer on zinc oxide(ZnO),the three fullerene derivatives can all reduce the work function of ZnO via modulation of the interfacial dipoles and lead a better electrical coupling.As introducing treatment of toluene,the obvious self-assembly of fullerene derivatives were observed,which were supported by X-ray diffraction and contact angle of water measurement.Base on PTB7-Th:PC71 BM system,the inverted organic solar cells devices with structure of ITO/ZnO/fullerene derivatives/PTB7-Th:PC71BM/Mo03/Al got power conversion efficiencies of 8.62%,8.83%and 9.00%for C60-4 TPB,C60-2 HMTPB and C60-2 EHTPB,respectively,compared 8.13%of devices with bare ZnO.The result of conjugated amphiphilic triblock fullerene derivatives provides a straightforward approaching by simultaneously modulating the morphology and interfacial work function of ZnO,which can also lead high performance in optoelectronic devices.Two A-B-C type conjugated amphiphilic triblock fullerene derivatives C60-2 HMTPB and C60-2 EHTPB were obtained in multi steps synthesis with three different blocks,and the amphiphilic diblock molecular C60-4 TPB was also preferred as a reference.When as modifying layer on zinc oxide（ZnO）,the three fullerene derivatives can all reduce the work function of ZnO via modulation of the interfacial dipoles and lead a better electrical coupling.As introducing treatment of toluene,the obvious self-assembly of fullerene derivatives were observed,which were supported by X-ray diffraction and contact angle of water measurement.Base on PTB7-Th:PC71 BM system,the inverted organic solar cells devices with structure of ITO/ZnO/fullerene derivatives/PTB7-Th:PC71BM/Mo03/Al got power conversion efficiencies of 8.62%,8.83% and 9.00% for C60-4 TPB,C60-2 HMTPB and C60-2 EHTPB,respectively,compared 8.13% of devices with bare ZnO.The result of conjugated amphiphilic triblock fullerene derivatives provides a straightforward approaching by simultaneously modulating the morphology and interfacial work function of ZnO,which can also lead high performance in optoelectronic devices.

关 键 词：Amphiphilic triblock fullerene derivatives Interfacial dipoles Interface compatibility Self-assembly Water contact angle 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O621.3[理学—有机化学]