All-Polymer Solar Cells and Photodetectors with Improved Stability Enabled by Terpolymers Containing Antioxidant Side Chains  

作　　者：Chunyang Zhang Ao Song Qiri Huang Yunhao Cao Zuiyi Zhong Youcai Liang Kai Zhang Chunchen Liu Fei Huang Yong Cao 

机构地区：[1]Institute of Polymer Optoelectronic Materials and Devices,State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,People’s Republic of China

出　　处：《Nano-Micro Letters》2023年第9期190-204,共15页纳微快报（英文版）

基　　金：The work was financially supported by National Key Research and Development Program of China(2019YFA0705900,2022YFB4200400)funded by MOST;the Basic and Applied Basic Research Major Program of Guangdong Province(No.2019B030302007);the National Natural Science Foundation of China(No.U21A6002);Guangdong-Hong Kong-Macao joint laboratory of optoelectronic and magnetic functional materials(No.2019B121205002);C.Z.acknowledges the financial support by Basic and Applied Basic Research Major Program of Guangdong Province(No.202201010270).

摘　　要：It is of vital importance to improve the long-term and photostability of organic photovoltaics,including organic solar cells(OSCs)and organic photodetectors(OPDs),for their ultimate industrialization.Herein,two series of terpolymers featuring with an antioxidant butylated hydroxytoluene(BHT)-terminated side chain,PTzBI-EHp-BTBHTx and N2200-BTBHTx(x=0.05,0.1,0.2),are designed and synthesized.It was found that incorporating appropriate ratio of benzothiadiazole(BT)with BHT side chains on the conjugated backbone would induce negligible effect on the molecular weight,absorption spectra and energy levels of polymers,however,which would obviously enhance the photostability of these polymers.Consequently,all-polymer solar cells(all-PSCs)and photodetectors were fabricated,and the all-PSC based on PTzBI-EHp-BTBHT0.05:N2200 realized an optimal power conversion efficiency(PCE)approaching~10%,outperforming the device based on pristine PTzBI-EHp:N2200.Impressively,the all-PSCs based on BHT-featuring terpolymers displayed alleviated PCEs degradation under continuous irradiation for 300 h due to the improved morphological and photostability of active layers.The OPDs based on BHT-featuring terpolymers achieved a lower dark current at−0.1 bias,which could be stabilized even after irradiation over 400 h.This study provides a feasible approach to develop terpolymers with antioxidant efficacy for improving the lifetime of OSCs and OPDs.

关 键 词：Organic photovoltaics Device operational stability All-polymer solar cell Organic photodetector ANTIOXIDANT 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TN36[电子电信—物理电子学] TQ317[化学工程—高聚物工业]