Pressure Affected\nInterface Effect in Nanoheterojunctions\nFormed by Au Nanoparticles Anchoring CsPbBr<sub>3</sub> Nanocrystals

Plasmon\nenhanced perovskite photovoltaic materials are\nan important\ndirection for the development of perovskite materials. Interfacial\nbehavior of the plasmon and perovskite determines photovoltaic properties.\nOn the other hand, pressure is a powerful noninvasive method to modify\ninterfacial interaction. Thus, an Au-CsPbBr<sub>3</sub> nanoheterojunction\nis formed by depositing Au nanoparticles on the surface of CsPbBr<sub>3</sub> nanocrystals. Pressure affected optical properties indicated\nthat both electron delocalization and hole migration can be modified\nin the nanoheterojunction. Electron delocalization is enhanced with\ndecreasing pressure-induced interspace. Hole migration is also accelerated\nwith increasing pressure-induced valence band in CsPbBr<sub>3</sub>. These results show a new method to adjust charge behavior in heterojunctions\nand thus a way to optimize photovoltaic properties.