Chlorine-free processed high performance organic solar cells

In this work, we demonstrate the successful replacement of a chlorinated solvent system based on a 1 : 1 mixture of chlorobenzene and ortho -dichlorobenzene with the chlorine-free solvent xylene, resulting in chlorine-free processing with a small amount of diiodooctane additive. In fact, the overall power conversion efficiency is improved from 6.71% for the chlorinated solvents to 7.15% for the chlorine-free solvent m -xylene.