文献类型：期刊文献

英文题名：High electron mobility fluorinated indacenodithiophene small molecule acceptors for organic solar cells

作者：Pan, Fei Li, Xiaojun Bai, Song Liu, Tianhao Wei, Xian Li, Yingfen Chen, Shanshan Yang, Changduk Chen, Xiwen Lv, Menglan Li, Yongfang

第一作者：Pan, Fei

通信作者：Lv, ML[1];Li, YF[2]

机构：[1]Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;[2]Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China;[3]Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China;[4]Guizhou Univ, Sch Chem & Chem Engn, Guiyang 550025, Peoples R China;[5]Chongqing Univ, Sch Energy & Power Engn, MOE Key Lab Low Grade Energy Utilizat Technol & S, CQU NUS Renewable Energy Mat & Devices Joint Lab, Chongqing 400044, Peoples R China;[6]Ulsan Natl Inst Sci & Technol UNIST, Sch Energy & Chem Engn, Dept Energy Engn, Low Dimens Carbon Mat Ctr, Ulsan 689798, South Korea;[7]Guangzhou Polyforte Chem Technol Co Ltd, Guangzhou 510520, Peoples R China

第一机构：贵州理工学院化学工程学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China;corresponding author), Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China.|贵州理工学院化学工程学院;贵州理工学院;

年份：2021

卷号：32

期号：3

起止页码：1257-1262

外文期刊名：CHINESE CHEMICAL LETTERS

收录：;Scopus(收录号：2-s2.0-85092611338);WOS:【SCI-EXPANDED(收录号:WOS:000642400700009)】；

基金：The work was supported by the Natural Science Foundation of China (Nos. 51820105003, 51863002 and 51973042) , Excellent young scientific and technological talents of Guizhou, China (No. QKHPTRC [2019] 5652) .

语种：英文

外文关键词：Organic solar cells; Indacenodithiophene; Electron mobility; Fluorination; pi-pi Stacking; Crystallinity

摘要：Indacenodithiophene (IDT) derivatives are kinds of the most representative and widely used cores of small molecule acceptors (SMAs) in organic solar cells (OSCs). Here we systematically investigate the influence of end-group fluorination density and position on the photovoltaic properties of the IDT-based SMAs IDIC-nF (n = 0, 2, 4). The absorption edge of IDIC-nF red-shifts with the pi-pi stacking and crystallinity improvement, and their electronic energy levels downshift with increasing n. Due to the advantages of J(sc) and FF as well as acceptable V-oc, the difluorinated IDIC-2F acceptor based OSCs achieve the highest power conversion efficiency (PCE) of 13%, better than the OSC devices based on IDIC and IDIC-4F as acceptors. And the photovoltaic performance of the PTQ10: IDIC-2F OSCs is insensitive to the active layer thickness: PCE still keep high values of 12.00% and 11.46% for the devices with active layer thickness of 80 and 354 nm, respectively. This work verifies that fine and delicate modulation of the SMAs molecular structure could optimize photovoltaic performance of the corresponding OSCs. Meanwhile, the thickness-insensitivity property of the OSCs has potential for large-scale and printable fabrication technology. (C) 2020 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.