Binary Additives Regulate the PCBM[70] Aggregate Morphology for
Highly Efficient Polymer Solar Cells
Abstract
We optimized the performance of polymer solar cells (PSCs) based on PBDTTT-C-T:PC71BM
with the binary solvent additives of 1,8diiodomethane (DIO) and chloronaphthalene (CN). The
power conversion efficiency was significantly improvedfrom 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.
Xi Fan* (樊细), Hao Wang(王浩)*, et al., ACS Photonics 2014,1,1278−1284.
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