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Fluorination-substitution effect on all-small-molecule organic solar cells

查看全文 作　　者：Qiong [1,2]Wu;Dan [1]Deng;Jianqi [1]Zhang;Wenjun [1]Zou;Yang [1,2]Yang;Zhen [1,2]Wang;Huan [1,2]Li;Ruimin [1,3]Zhou;Kun [1]Lu;Zhixiang [1]Wei 高影响力作者 机构地区：[1]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China;[2]University of Chinese Academy of Sciences, Beijing 100049, China;[3]Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100190, China高影响力机构 出　　处：《Science China Chemistry》索引2019年第62卷第7期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(51603051,21534003);the Ministry of Science and Technology of China(2016YFA0200700,2016YFF0203803);the Beijing Nova Program,the Youth Innovation Promotion Association,Chinese Academy of Sciences 摘　　要：Due to the strong crystallinity and anisotropy of small molecules, matched molecular photoelectric properties and morphologies between small molecules and non-fullerene acceptors are especially important in all-small-molecule organic solar cells(OSCs).Introducing fluorine atoms has been proved as an effective strategy to achieve a high device performance through tuning molecular energy levels, absorption and assembly properties. Herein, we designed a novel benzodithiophene-based small molecule donor BDTF-CA with deep highest occupied molecular orbital(HOMO) energy level. All-small-molecule OSCs were fabricated by combing non-fullerene acceptor IDIC with different fluorine-atom numbers. Two or four fluorine atoms were introduced to the end-capped acceptor of IDIC, which are named as IDIC-2 F and IDIC-4 F, respectively. With the increase of fluorination from IDIC to IDIC-4 F, the open circuit voltage(Voc) of the devices decreased, while hole and electron mobilities of the active layers increased by one order of magnitude. Contributed to the most balanced Voc, short-circuit current(Jsc) and fill factor(FF), the device based on BDTF-CA/IDIC-2 F achieved the highest power conversion efficiency of 9.11%. 关 键 词：ORGANIC solar cells all-small-molecule FLUORINATION BLEND morphology energy LEVELS
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