title: Improving Photovoltaic Performance of the Linear A-Ar-A-type Small Molecules with Diketopyrropyrrole Arms by Tuning the Linkage Position of the Anthracene Core.
abstract: Two isomeric A-Ar-A-type small molecules of DPP2An(9,10) and DPP2An(2,6), were synthesized with two acceptor arms of diketopyrropyrroles (DPP) and a planar aryl hydrocarbon core of the different substituted anthracene (An), respectively. Their thermal stability, crystallinity, optoelectronic, and photovoltaic performances were investigated. Significantly red-shifted absorption profile and higher HOMO level were observed for the DPP2An(2,6) with 2,6-substituted anthracene relative to the DPP2An(9,10) with 9,10-substituted anthracene, as the former exhibited better planarity and a larger conjugate system. As a result, the solution-processing solar cells based on DPP2An(2,6) and PC71BM (w/w,1:1) displayed remarkably increased power conversion efficiency of 5.44% and short-circuit current density (Jsc) of 11.90 mA/cm(2) under 1% 1,8-diiodooctane additive. The PCE and Jsc values were 3.7 and 2.9 times those of the optimized DPP2An(9,10)-based cells, respectively. This work demonstrates that changing the linkage position of the anthracene core in the A-Ar-A-type SMs can strongly improve the photovoltaic properties in organic solar cells.
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Xiongwei
authors.initials: X
authors.lastname: Duan
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.|Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao 266101, China.
authors.forename: Manjun
authors.initials: M
authors.lastname: Xiao
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Jianhua
authors.initials: J
authors.lastname: Chen
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Wenhong
authors.initials: W
authors.lastname: Peng
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Linrui
authors.initials: L
authors.lastname: Duan
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Tan
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Gangtie
authors.initials: G
authors.lastname: Lei
authors.affiliation: Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences , Qingdao 266101, China.
authors.forename: Renqiang
authors.initials: R
authors.lastname: Yang
authors.affiliation: College of Chemistry, Xiangtan University, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education , Xiangtan 411105, China.
authors.forename: Weiguo
authors.initials: W
authors.lastname: Zhu
keywords: A-Ar-A-type small molecules; anthracene; diketopyrropyrroles; organic solar cells; photovoltaic property