UV-vis-IR Broad Spectral Photodetectors Based on VO2-ZnO Nanocrystal Films

Danting Xu; Xia Zhu; Jiakun An; Gaoyu Chen; Jianchun Bao; Xiangxing Xu

doi:10.1021/acsomega.2c02549

UV-vis-IR Broad Spectral Photodetectors Based on VO₂-ZnO Nanocrystal Films

ACS Omega. 2022 Oct 13;7(42):37078-37084. doi: 10.1021/acsomega.2c02549. eCollection 2022 Oct 25.

Authors

Danting Xu¹, Xia Zhu¹, Jiakun An¹, Gaoyu Chen¹, Jianchun Bao¹, Xiangxing Xu¹

Affiliation

¹ Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing210046, P. R. China.

Abstract

As a narrow band semiconductor at room temperature and a metallic material above ∼68 °C, functional VO₂ films are widely investigated for smart windows, whereas their potential for ultraviolet-visible-infrared (UV-vis-IR) broad spectral photodetectors has not been efficiently studied. In this report, photodetectors based on VO₂-ZnO nanocrystal composite films were prepared by nanocrystal-mist (NC-mist) deposition. An enhanced photodetection switching ratio was achieved covering the ultraviolet to infrared wavelength. Due to the synergetic effect of nanosize, surface, phase transition, percolation threshold, and the band structure of the heterojunction, the transfer and transport of photogenerated carriers modulate the device performance. This study probes new chances of applying VO₂-semiconductor-based nanocomposites for broad spectral photodetectors.