title: D-π-A-π-A Strategy to Design Benzothiadiazole-carbazole-based Conjugated Polymer with High Solar Cell Voltage and Enhanced Photocurrent.
abstract: The theoretical calculations are used to find that D-π-A-π-A style conjugated polymer PC-TBTBT is more efficient for solar cells application than the D-π-A analog PC-TBT because the D-π-A-π-A structure has a narrower band gap and higher molar absorption coefficient and redshift spectrum. Motivated by the theoretical prediction, 5,6-bis(octyloxy)-2,1,3-benzothiadiazole and 2,7-carbazole are adopted to synthesize the D-π-A-π-A style PC-TBTBT (M(w) = 31.1 kDa) and D-π-A analog PC-TBT (M(w) = 87.5 kDa) by Suzuki coupling reaction. Experimental results confirm that D-π-A-π-A PC-TBTBT-based solar cell shows a power conversion efficiency (PCE) of 4.74% with high V(OC) of 0.99 V and enhanced J(SC) of 9.70 mA cm(-2). The PCE and J(SC) achieve improvements of 17% and 26%, respectively, compared to the D-π-A PC-TBT-based solar cell.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Manxi
authors.initials: M
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Zhenqing
authors.initials: Z
authors.lastname: Yang
authors.affiliation: National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.
authors.forename: Chao
authors.initials: C
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Cao
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Qifang
authors.initials: Q
authors.lastname: Li
mesh_terms: D002227:Carbazoles / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D012993:Solar Energy; D013830:Thiadiazoles / Q000737:chemistry*
chemical_list: D002227:Carbazoles; D011108:Polymers; D013830:Thiadiazoles; C041514:carbazole; C015700:benzo-1,2,3-thiadiazole
keywords: acceptors; benzothiadiazole; conjugated polymers; photocurrents; polymer solar cells