Tin-based perovskite solar cells have attracted great research interest due to their excellent photovoltaic performance and environmentally friendly characteristics. However, TPSCs with ideal band gaps suffer from current losses, so new interface engineering strategies need to be developed to improve device performance. Researchers from Soochow University and Marmara University have reported high-performance tin-based perovskite solar cells (TPSCs) by constructing charge bridge paths.
The authors propose a method to construct charge transfer pathways through a simple post-growth treatment of 3-aminomethylbenzo[b]thiophene (3-AMBTh) on a perovskite film. The selective reaction of 3-AMBTh with exposed FA+ on the perovskite surface suppresses the formation of iodine vacancy defects, resulting in a reduction in trap density.
In addition, the residual aromatic rings on the surface form an effective π–π stacking interaction system with the subsequently deposited ICBA, which promotes charge transfer at the interface.
By harnessing the potential of the charge transfer path, the TPSCs exhibit device efficiency of up to 14.53%, which according to the team, positions them among the top-performing TPSCs reported to date.
