文献类型：期刊文献

英文题名：Achieving Fast Charge Separation and Low Nonradiative Recombination Loss by Rational Fluorination for High-Efficiency Polymer Solar Cells

作者：Sun, Chenkai Pan, Fei Chen, Shanshan Wang, Rui Sun, Rui Shang, Ziya Qiu, Beibei Min, Jie Lv, Menglan Meng, Lei Zhang, Chunfeng Xiao, Min Yang, Changduk Li, Yongfang

第一作者：Sun, Chenkai

通信作者：Meng, L[1];Li, YF[1];Li, YF[2];Min, J[3];Lv, ML[4];Li, YF[5]

机构：[1]Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China;[2]Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China;[3]Chongqing Univ, MOE Key Lab Low Grade Energy Utilizat Technol & S, CQU NUS Renewable Energy Mat & Devices Joint Lab, Sch Energy & Power Engn, Chongqing 400044, Peoples R China;[4]Ulsan Natl Inst Sci & Technol, Dept Energy Engn, Sch Energy & Chem Engn, Low Dimens Carbon Mat Ctr, Ulsan 689798, South Korea;[5]Nanjing Univ, Natl Lab Solid State Microstruct, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China;[6]Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China;[7]Wuhan Univ, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China;[8]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Guizhou, Peoples R China;[9]Soochow Univ, Lab Adv Optoelect Mat, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Jiangsu, Peoples R China

第一机构：Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China;corresponding author), Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China;corresponding author), Wuhan Univ, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China;corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Guizhou, Peoples R China;corresponding author), Soochow Univ, Lab Adv Optoelect Mat, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Jiangsu, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2019

卷号：31

期号：52

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20194707718146);Scopus(收录号：2-s2.0-85075216855);WOS:【SCI-EXPANDED(收录号:WOS:000496319800001)】；

基金：C.S. and F.P. contributed equally to this work. This work was supported by National Natural Science Foundation of China (Grant Nos. 91633301, 21734008, and 51820105003) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB12030200).a

语种：英文

外文关键词：charge separation; fluorination; low-cost copolymer donors; nonradiative recombination; voltage loss

摘要：Four low-cost copolymer donors of poly(thiophene-quinoxaline) (PTQ) derivatives are demonstrated with different fluorine substitution forms to investigate the effect of fluorination forms on charge separation and voltage loss (V-loss) of the polymer solar cells (PSCs) with the PTQ derivatives as donor and a A-DA'D-A-structured molecule Y6 as acceptor. The four PTQ derivatives are PTQ7 without fluorination, PTQ8 with bifluorine substituents on its thiophene D-unit, PTQ9, and PTQ10 with monofluorine and bifluorine substituents on their quinoxaline A-unit respectively. The PTQ8- based PSC demonstrates a low power conversion efficiency (PCE) of 0.90% due to the mismatch in the highest occupied molecular orbital (HOMO) energy levels alignment between the donor and acceptor. In contrast, the devices based on PTQ9 and PTQ10 show enhanced charge-separation behavior and gradually reduced V-loss, due to the gradually reduced nonradiative recombination loss in comparison with the PTQ7-based device. As a result, the PTQ10-based PSC demonstrates an impressive PCE of 16.21% with high open-circuit voltage and large short-circuit current density simultaneously, and its V-loss is reduced to 0.549 V. The results indicate that rational fluorination of the polymer donors is a feasible method to achieve fast charge separation and low V-loss simultaneously in the PSCs.