Research Progress and Prospect of Layer‐By‐Layer Deposited Organic Solar Cells

Organic solar cells (OSCs) have become a research hotspot in the photovoltaic field due to their advantages of light weight, good flexibility and large‐scale production. The layer‐by‐layer (LbL) spin coating method is an effective strategy for the preparation of high‐performance OSCs. Compared with bulk heterojunction (BHJ) structure, the donor (D) and acceptor (A) materials are deposited sequentially in the LBL structure, forming a p‐i‐n‐like structure, which promote charge generation and extraction. Furthermore, the unique advantage of the LbL structure in independently processing become a promising method for large‐scale printing OSCs. In this paper, some representative works of LbL OSCs are summarized, focusing on the working mechanism, structural features, and device optimization method of LbL OSCs. Finally, an outlook on the application of large‐scale photovoltaic device and the development of high‐performance LbL OSCs are made.