van der Waals integration of mixed-dimensional CeO2@Bi heterostructure for high-performance self-powered photodetector with fast response speed

Xinlin Liu; Cailing Liu; Yushuang Fu; Yiguo Xu; Karim Khan; Ayesha Khan Tareen; Ye Zhang

doi:10.1039/d2nr04428e

van der Waals integration of mixed-dimensional CeO₂@Bi heterostructure for high-performance self-powered photodetector with fast response speed

Nanoscale. 2022 Nov 10;14(43):16120-16129. doi: 10.1039/d2nr04428e.

Authors

Xinlin Liu¹, Cailing Liu¹, Yushuang Fu¹, Yiguo Xu², Karim Khan³, Ayesha Khan Tareen³, Ye Zhang¹

Affiliations

¹ School of Chemistry and Chemical Engineering, University of South China, Hengyang 421001, China. yezhang@usc.edu.cn.
² Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, China. yiguo.xu@outlook.com.
³ School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China.

PMID: 36301088
DOI: 10.1039/d2nr04428e

Abstract

Heterostructures have been extensively investigated for optoelectronic devices owing to their fantastic physicochemical properties. Herein, a mixed-dimensional van der Waals heterostructure (vdWH) CeO₂@Bi, 1D ceria (CeO₂) loaded with 0D bismuth quantum dots (Bi QDs), is synthesized through a facile hydrothermal bottom-up method. It is found that the fabricated CeO₂@Bi-based photoelectrochemical (PEC)-type photodetector (PD) shows self-powered photodetection capability with a fast photoresponse speed of 0.02 s. Besides, a photocurrent of 2.00 μA cm^-2 and a photoresponsivity of 888.89 μA W^-1 under 365 nm illumination are obtained. Furthermore, good long-term cycle stability is also observed after 1 month in a harsh environment, indicating the great potential for practical applications. These results are further supported by density functional theory (DFT) calculations. We believe that the presented work is expected to provide a new pathway for the future utilization of vdWHs for high-performance optoelectronics.