Mechanochemical synthesis of nonfullerene small molecular acceptors

Abstract

Ball milling Knoevenagel condensation reactions of dialdehyde aromatic derivatives and methylene-activated derivatives have been conducted in air and solvent-free systems with ammonium acetate as the catalyst to obtain a series of nonfullerene small molecular acceptors. Organic solar cells based on the fully non-fused ring acceptor SMA-8 showed a power conversion efficiency of 10.02%.