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Herein, SiO2 nanosheets with thicknesses of 25−100 nm are used to enhance the performance of Au/CdBr2 Schottky barriers. The Au/CdBr2/SiO2/Au straddling‐type heterojunction devices are prepared by the thermal evaporation technique. It is observed that SiO2 layers enhance the crystallinity of CdBr2 through increasing the crystallite sizes and decreasing the defect density, stacking faults, and microstrain...