Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2017-10-01

Journal: NANO ENERGY

Included Journals: EI、SCIE、Scopus

Volume: 40

Page Number: 440-446

ISSN: 2211-2855

Key Words: Self-power and broadband photodetector; Piezo-phototronic effect; Si/ZnO/CdO

Abstract: The broadband and self-powered photodetectors have attracted significant attention due to the versatility and without extra energy. In this work, we fabricate a self-powered and broadband photodetector based on Si/ZnO/CdO three-component heterojunctions. The photodetector has a fast response time (shorter than 0.45 s) to the ultraviolet and visible illumination at 0 V bias. CdO film is used as the transparent electrode because of the superior electrical characterization and the appropriate band structure of ZnO/CdO, which facilitates electrons transferring from ZnO nanorods to the CdO electrode and reflects holes back into the ZnO, thus reducing recombination at the ZnO/CdO interface and enhancing photocurrent. Moreover the performance of the photodetector is optimized and significantly enhanced by the piezo-phototronic effect of ZnO nanorods. This work may provide a potential approach to enhance the performance of self-powered and broadband photodetectors.