Top-down approach for nanophase reconstruction in bulk heterojunction solar cells.

Kong, Jaemin; Hwang, In-Wook; Lee, Kwanghee · Adv Mater · 2014

basic_science · Level V

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Abstract

"Top-Down" nanophase reconstruction via a post-additive soaking process is first presented with various BHJ binary composites. By simply rinsing as-cast BHJ films with a solvent mixture containing a few traces of a nanophase-control reagent such as 1,8-diiodooctane, oversized fullerene-rich clusters (>100 nm in dia-meter) in the BHJ film are instataneously disassembled and entirely reorganized into finely intermixed donor/acceptor nanophases (ca. 10 nm) with a 3D compositional homogeneity, without surface segregation.