A simple structure copolymer donor based on carboxylated benzodithiophene for polymer solar cells  

作　　者：Xiaochen Wang Rui Zhao Zicheng Ding Shengzhong(Frank)Liu Yongfang Li 

机构地区：[1]School of Materials Science and Engineering,Shaanxi Normal University,Xi’an 710119,China [2]Shaanxi Key Laboratory for Advanced Energy Devices,Shaanxi Engineering Lab for Advanced Energy Technology,Shaanxi Normal University,Xi’an 710119,China [3]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China Chemistry》2022年第9期1775-1781,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(51773046);the Fundamental Research Funds for the Central Universities;the School of Materials Science and Engineering,Shaanxi Normal University。

摘　　要：The design and development of low-cost and efficient photovoltaic materials remain a major challenge for the research and application of polymer solar cells(PSCs).Therefore,developing efficient photovoltaic polymers with simple structure and easy preparation has become an important research topic.Here we report a facilely synthesized electron-donating polymer X1 with a simple chemical structure,which is composed of carboxylated benzo[1,2-b:4,5-b′]dithiophene(BDT)and thiophene unit.The carboxylate substituents on the BDT unit endowed the polymer with appropriate solubility,low-lying highest occupied molecular orbital(HOMO)energy level,and superior absorption.The PSCs based on X1 as the donor showed a high power conversion efficiency of 16.6%,with a remarkable short-circuit current density of 27.07 m A cm^(-2).These results demonstrated that X1 is a highly promising candidate for low-cost and efficient PSCs.Furthermore,this study revealed the potential of carboxylated BDT as an effective building block in the research and development of high-performance photovoltaic materials.

关 键 词：polymer donor CARBOXYLATE benzodithiophene(BDT) LOW-COST polymer solar cells(PSCs) 

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