Subtle Balance Between Length Scale of Phase Separation and Domain Purification in Small-Molecule Bulk-Heterojunction Blends under Solvent Vapor Treatment

Li MM; Liu F; Wan XJ; Ni W; Kan B; Feng HR; Zhang Q; Yang X; Wang YC; Zhang YM; Shen Y; Russell TP; Chen YS

Advanced Materials, Vol.27, No.40, 6296-6302, 2015

DOI10.1002/adma.201502645 Export Citation

Subtle Balance Between Length Scale of Phase Separation and Domain Purification in Small-Molecule Bulk-Heterojunction Blends under Solvent Vapor Treatment

Li MM, Liu F, Wan XJ, Ni W, Kan B, Feng HR, Zhang Q, Yang X, Wang YC, Zhang YM, Shen Y, Russell TP, Chen YS

A series of solvents with different solubilities for DR3TBDTT and PC71BM, and different boiling points, is used for solvent vapor annealing (SVA) treatment to systematically investigate the solvent-morphologyperformance relationship. The presence of solvent molecules inside bulk-heterojunction (BHJ) thin films promotes the mobility of both donor and acceptor molecules, leading to crystallization and aggregation, which are important in modulating morphology.

Keywords:morphology;small-molecule-based solar cells;solvent vapor annealing