Mixed-Dimensional Heterostructure of CsPbBr₃ Nanocrystal and Bi₂O₂Se Nanosheet

Abstract

Recently, semiconductor heterostructures comprising mixed-dimensional materials have attracted widespread attention due to their application in catalysis, photovoltaics, and optoelectronics. Here, we report the nano-heterostructure integration of CsPbBr 3 nanocrystals (NCs) and ultrathin nanosheets (NSs) of Bi 2 O 2 Se to explore their optical properties. The formation of heterostructures was verified from the powder X-ray diffraction (PXRD) pattern and transmission electron microscopy (TEM) analysis, whereas the bonding interactions were studied using Fourier transform infrared (FTIR) spectroscopy. The photoluminescence (PL) quenching of CsPbBr 3 NCs in the mixed-dimensional CsPbBr 3 @Bi 2 O 2 Se heterostructure was evidenced both at 298 and 77 K. Time-resolved PL was implemented to examine the charge transfer characteristics in these mixed-dimensional nano-heterostructures at both temperatures. PL quenching appeared as a result of the charge transfer from the conduction band of CsPbBr 3 to Bi 2 O 2 Se via type-I electronic band alignment. The rate of charge transfer across the heterojunction was found to be relatively faster at 298 K than at 77 K.

A Review on Halide Perovskite-Based Photocatalysts: Key Factors and Challenges

“…Similarly, a heterostructure between CsPbBr 3 nanocrystals and Bi 2 O 2 Se nanosheets was obtained. Increasing amount of Bi 2 O 2 Se was related to an increase in photoluminescence quenching, demonstrating charge transfer from the conduction band of CsPbBr 3 to that of Bi 2 O 2 Se . Another example of successful charge separation was demonstrated by Cheng and co-workers.…”

Boosting Artificial Photosynthesis: CO2 Chemisorption and S-Scheme Charge Separation via Anchoring Inorganic QDs on COFs

“…The difference in Fermi levels induces the bending of energy bands and the formation of a built-in electric field, both acting as the propelling force for the migration of photocarriers. Consequently, photoelectrons in the reduction photocatalyst and holes in the oxidation photocatalyst, which possess stronger redox abilities, accumulate and participate in photoreactions. − CsPbBr 3 , a representative halide perovskite material, exhibits a tunable bandgap, quantum size effects, and competing photoelectrical properties. − Compared to COFs, CsPbBr 3 quantum dots (QDs) function as more powerful reduction photocatalysts, and their integration with COFs is anticipated to create desirable S-scheme heterojunctions with effective separation of powerful photoexcited carriers. − Collaborating with efficient chemisorption of CO 2 contributed by Schiff-base COFs, enhanced photocatalytic CO 2 reduction performance over the heterojunctions of COF/QDs can be foreseeable.…”

Optimizing Thermoelectric Performance of Hybrid Crystals Bi2O2Se1−xTex in the Bi2O2X System

“…As a result, they are only used in specific niche markets such as aerospace and specialized power sources. Secondly, many thermoelectric materials need better thermal and chemical stability at high temperatures (600 • C), limiting their specific applications [5][6][7].…”