H- and J-aggregation of conjugated small molecules in organic solar cells

As H- and J-aggregation receive more and more attention in the research of OSCs, especially in small molecular systems, deep understanding of aggregation behavior is needed to guide the design of conjugated small molecular structure and the fabrication process of OSC device. For this end, this review is written. Here, the review firstly introduced the basic information about H- and J-aggregation of conjugated small molecules in OSCs. Then, the characteristics of H- and J-aggregation and the methods to identify them were summarized. Next, it reviewed the research progress of H- and J-aggregation of conjugated small molecules in OSCs, including the factors influencing H- and J-aggregation in thin film and the effects of H- and J-aggregation on OPV performance.