Mediating Solar Cell Performance by Controlling the Internal Dipole Change in Organic Photovoltaic Polymers

被引:131
作者
Carsten, Bridget [1 ,2 ]
Szarko, Jodi M. [4 ]
Lu, Luyao [1 ,2 ]
Son, Hae Jung [1 ,2 ]
He, Feng [1 ,2 ]
Botros, Youssry Y. [5 ,6 ]
Chen, Lin X. [3 ,4 ,7 ]
Yu, Luping [1 ,2 ]
机构
[1] Univ Chicago, Dept Chem, Chicago, IL 60637 USA
[2] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA
[3] Northwestern Univ, ANSER Ctr, Evanston, IL 60208 USA
[4] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA
[5] Intel Labs, Univ Res Off, Santa Clara, CA 95054 USA
[6] KACST, Natl Ctr Nanotechnol Res, Riyadh 11442, Saudi Arabia
[7] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA
关键词
SEMICONDUCTING POLYMERS; MORPHOLOGY; EFFICIENCY;
D O I
10.1021/ma3011119
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
We report synthesis and characterizations of two novel series of polymers, namely the PBTZ and PBIT series. The PBTZ1 polymer was synthesized as a copolymer of 4,8-bis(2-butyloctyl)benzo[1,2-b:4,5-b']dithiophene (BDT) along with 2,5-bis(2-ethylhexyl)-3,6-bisthiazol-2-yl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (TzDPP), while PBTZ2 was a copolymer of TzDPP and 2-(1-butylheptyl)-thieno[3,4-d]thiazole (TTz). The PBIT series based on dithienopyrrolobenzothiadiazole (DPBT), and BDT was also synthesized. The PBIT series of polymers showed enhanced ground and excited state dipole moments (mu(g) and mu(e)) when compared to the previously reported PBB3 polymer, while PBTZ1 showed the largest dipole change (1.52 D) from ground to excited state (Delta mu(ge)) in respective single polymer units. It was found that the power conversion efficiencies of the polymer series were strongly correlated to Delta mu(ge). The results reported demonstrate the utility of the calculated parameter Delta mu(ge) of single units of the polymers to predict the performance of donor-acceptor copolymers in photovoltaic devices. We rationalize this result based on the large degree of polarization in the excited state, which effectively lowers the Coulomb binding energy of the exciton in the excited state and leads to faster charge separation kinetics, thus facilitating the full separation of electron and hole.
引用
收藏
页码:6390 / 6395
页数:6
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