van der Waals integration of mixed-dimensional CeO 2 @Bi heterostructure for high-performance self-powered photodetector with fast response speed

• Published in: Nanoscale Vol. 14; no. 43; pp. 16120 - 16129
• Main Authors: Liu, Xinlin, Liu, Cailing, Fu, Yushuang, Xu, Yiguo, Khan, Karim, Tareen, Ayesha Khan, Zhang, Ye
• Format: Journal Article
• Language: English
• Published: 10.11.2022
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/D2NR04428E

Heterostructures have been extensively investigated for optoelectronic devices owing to their fantastic physicochemical properties. Herein, a mixed-dimensional van der Waals heterostructure (vdWH) CeO 2 @Bi, 1D ceria (CeO 2 ) loaded with 0D bismuth quantum dots (Bi QDs), is synthesized through a facile hydrothermal bottom-up method. It is found that the fabricated CeO 2 @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.