title: Immiscible solvents enabled nanostructure formation for efficient polymer photovoltaic cells.
abstract: Organic photovoltaics (OPVs) fabricated via solution processing are an attractive way to realize low cost solar energy harvesting. Bulk heterojunction (BHJ) devices are the most successful design, but their morphology is less controllable. In this manuscript, we describe a simple approach to realize 'ordered' BHJ morphology using two immiscible solvents with different boiling point and a quasi-bilayer approach. Tunable fine structures were demonstrated in poly(3-hexylthiophene) (P3HT) and [6,6]-Phenyl C61 butyric acid methyl ester (PCBM) model systems, and the devices with optimized fine structure showed a 33% efficiency enhancement compared to those with a planar bilayer structure.
authors: Department of Material Science and Engineering, University of California Los Angeles, CA 90095, USA. School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors: Dong-Hyun
authors: DH
authors: Lee
authors: Yang
authors: Y
authors: Michael Yang
authors: Jingbi
authors: J
authors: You
authors: Eric
authors: E
authors: Richard
authors: Gang
authors: G
authors: Li