Tin-based perovskite solar cells (TPSC) 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.
Wang Zhaokui and others from Suzhou University realized high-performance tin perovskite photovoltaics 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 exploiting the potential of charge transfer pathways, TPSC exhibits excellent device efficiency up to 14.53%.
Fan Hu et.al Constructing Charge Bridge Path for High-Performance Tin Perovskite Photovoltaics Adv. Energy Mater. 2024
DOI: 10.1002/aenm.202302926