Abstract
We optimized the performance of polymer solar cells (PSCs) based on PBDTTT-C-T:PC71BM with the binary solvent additives of 1,8-diiodomethane (DIO) and chloronaphthalene (CN). The power conversion efficiency was significantly improved from 3.44% for the PSC without additives to 7.91% for the PSC with the additives (DIO/CN = 1:2). It is attributed to the achievement of highly penetrating PC71BM aggregate structures, which have small aggregate particles, and dense and well-packed pathways, inducing a high electron mobility. Our work not only provides an effective method to regulate the PC71BM aggregate structures for highly efficient PSC devices but also indicates an underlying mechanism of the performance enhancement by solvent additives.
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