Pressure Affected Interface Effect in Nanoheterojunctions Formed by Au Nanoparticles Anchoring CsPbBr₃ Nanocrystals

Abstract

Plasmon enhanced perovskite photovoltaic materials are an important direction for the development of perovskite materials. Interfacial behavior of the plasmon and perovskite determines photovoltaic properties. On the other hand, pressure is a powerful noninvasive method to modify interfacial interaction. Thus, an Au-CsPbBr 3 nanoheterojunction is formed by depositing Au nanoparticles on the surface of CsPbBr 3 nanocrystals. Pressure affected optical properties indicated that both electron delocalization and hole migration can be modified in the nanoheterojunction. Electron delocalization is enhanced with decreasing pressure-induced interspace. Hole migration is also accelerated with increasing pressureinduced valence band in CsPbBr 3 . These results show a new method to adjust charge behavior in heterojunctions and thus a way to optimize photovoltaic properties.