A tetraphenylethylene core-based 3D structure small molecular acceptor enabling efficient non-fullerene organic solar cells

Abstract

A tetraphenylethylene core-based small molecular acceptor with a unique 3D molecular structure is developed. Bulk-heterojunction blend films with a small feature size (≈20 nm) are obtained, which lead to non-fullerene organic solar cells (OSCs) with 5.5% power conversion efficiency. The work provides a new molecular design approach to efficient non-fullerene OSCs based on 3D-structured small-molecule acceptors.

Keywords: 3D structure; non-fullerene organic solar cell; organic solar cell; small molecular acceptor; tetraphenylethylene.