Constructing Charge Bridge Path for High‐Performance Tin Perovskite Photovoltaics

Abstract

Tin‐based perovskite solar cells (TPSCs) have attracted significant research interest due to their exceptional optoelectronic properties and environmentally friendly characteristics. However, TPSCs with ideal bandgap suffer from substantial current losses, necessitating the development of innovative interface engineering strategies to enhance device performance. In this study, an unprecedented approach constructing charge transfer path is presented by a simple post‐growth treatment of 3‐Aminomethylbenzo[b]thiophene (3‐AMBTh) on the perovskite film. The selective reaction of 3‐AMBTh with exposed FA+ on the perovskite surface suppresses the formation of iodine vacancy defects, leading to a reduction in trap density. Additionally, the residual aromatic rings on the surface form an effective π–π stacking interaction system with subsequently deposited ICBA, facilitating enhanced charge transfer at the interface. By harnessing the potential of the charge transfer path, the TPSCs exhibit remarkable device efficiency of up to 14.53%, positioning them among the top‐performing TPSCs reported to date.

Selective Formation of Homochiral Dimers by Intermolecular Charge Transfer on a hBN Nanomesh

“…Therefore, the existence of the electron states observed in the STS mapping between these two molecules can only be attributed to the charge transfer of the dimer. Indeed, this type of charge transfer phenomenon is also reported in previous research studies, demonstrating that electron orbital overlap can significantly enhance the transfer capabilities between molecules . From Figure d, we can directly observe the HOMO orbital overlap of the dimer by STS mapping.…”

Tailoring the buried interface with self-assembled 2-chloroethylphosphonic acid for defect reduction and improved performance of tin-based perovskite solar cells

“…6–12 In particular, the reduction of interfacial defects, which act as deep-level trap states that induce non-radiative recombination and perovskite degradation, has been shown to be critical for improving the device performance. 13–15 Nevertheless, unlike the well-investigated upper interface, the buried interface of Sn-PSCs still requires further investigation due to the presence of more severe multi-scale imperfections.…”