Recent progress in side chain engineering of Y-series non-fullerene molecule and polymer acceptors

摘要

Organic solar cells (OSCs) have drawn considerable attention in the last decade due to the great potential of light weight, flexibility, and low-cost solution processing. Particularly, Y-series non-fullerene acceptors (NFAs) including small molecular acceptors (SMAs) and polymerized small molecular acceptors (PSMAs) have become research hot spots due to their excellent power conversion efficiency. Side chain engineering is crucial to adjust the solubility and crystallinity of NFAs, which will significantly affect the morphology of active layers and the efficiency of OSCs. However, the understanding of side chain engineering on NFAs is still limited and lacks a systematic review. This review aims to provide a brief summary of the recent developments in side chain engineering of NFAs, with a special focus on the design and application of Y-series SMAs and PSMAs for high-efficiency non-fullerene organic solar cells (NF-OSCs). In addition, the review also points out challenges and provides useful guidance regarding side chain regulation for Y-series NFAs.

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