Chemistry of Materials
Chemistry of Materials
5 years ago

High Extinction Coefficient Thieno[3,4-b]thiophene-Based Copolymer for Efficient Fullerene-Free Solar Cells with Large Current Density

High Extinction Coefficient Thieno[3,4-b]thiophene-Based Copolymer for Efficient Fullerene-Free Solar Cells with Large Current Density
Jintong Xu, Chunpeng Yang, Dangqiang Zhu, Junyi Wang, Yonghai Li, Renqiang Yang, Chunming Yang, Yongchao Zhang, Xichang Bao
A thieno[3,4-b]thiophene-based donor polymer PTBTz-2 was employed to construct fullerene-free solar cell with the classical acceptor ITIC. Interestingly, due to the high extinction coefficients and wide absorption for these two materials, the active layer can harvest a larger fraction of the coverage solar spectrum even in ultrathin film. Furthermore, the simultaneous advantages of appropriate cascade energy level, well-balanced hole/electron mobility (μh/μe = 1.16), and low charge accumulation and recombination, make the PTBTz-2/ITIC-based solar cells exhibit an excellent power conversion efficiency of 10.92% with large short circuit current density of 20.34 mA cm–2. The results indicate that fine-tailored thieno[3,4-b]thiophene-based polymers would be another type of promising donor materials, except for widely reported efficient benzo[d][1,2,3]triazole (BTA)- or benzo[1,2-c:4,5-c′]-dithiophene-4,8-dione (BDD)-based polymers, and would enrich the reservoir of high-performance light-harvesting conjugated polymers.

Publisher URL: http://dx.doi.org/10.1021/acs.chemmater.7b01650

DOI: 10.1021/acs.chemmater.7b01650

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