Hybrid CsPbBr3 quantum dots decorated two dimensional MoO3 nanosheets photodetectors with enhanced performance

Molybdenum trioxide (MoO3) have gained considerable attention for their wide applications ranging from optoelectronics, solar cells to energy storage. Herein, we obtained high crystalline MoO3 nanosheets (NSs) through a vapor phase epitaxy (VPE) method. A photodetector (PDs) based on MoO3 NSs was fabricated on the SiO2/Si substrate and the PDs exhibit a striking photoresponse under ultraviolet (UV) light. Furthermore, by introducing a CsPbBr3 QDs the photocurrent of the MoO3 devices was enhanced by 2 orders of magnitude than the pristine counterpart. The enhanced photocurrent could be ascribed to the interfacial charge transfer from CsPbBr3 QDs to MoO3. The hybrid CsPbBr3 QDs/MoO3 photodetectors exhibit high responsivity with high on/off ratio under UV light illumination. Furthermore, the performance of the hybrid device, extending from UV to visible light, has ensured broad spectral response of the device. This work indicates that CsPbBr3 QDs/MoO3 hybrids can be promising for the construction of broad band photodetectors and other optoelectronic devices. (C) 2022 The Authors. Published by Elsevier B.V.

Automated summary

High crystalline MoO3 nanosheets were obtained through a vapor phase epitaxy method and used to fabricate a photodetector with striking photoresponse. Introducing CsPbBr3 quantum dots significantly enhanced the photocurrent of MoO3 devices, leading to high responsivity and broad spectral response from UV to visible light. The study suggests that CsPbBr3 QDs/MoO3 hybrids hold promise for broad band photodetectors and other optoelectronic devices.