Piezo-phototronic effect enhanced self-powered and broadband photodetectors based on Si/ZnO/CdO three-component heterojunctions. (October 2017)

• Record Type: Journal Article
• Authors: Yin, Bing; Zhang, Heqiu; Qiu, Yu; Luo, Yingmin; Zhao, Yu; Hu, Lizhong
• Is Part Of: Nano energy. Volume 40(2017:Oct.)
• Page Start: 440
• Page End: 446
• Publication Date: 2017-10
• Subjects: Self-power and broadband photodetector -- Piezo-phototronic effect -- Si/ZnO/CdO; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.08.036
• Languages: English
• ISSNs: 2211-2855

Abstract

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. Graphical abstract: Piezo-phototronic effect enhances photodetectors based on Si/ZnO/CdO three-component heterojunctions. Highlights: A broadband photodetector based on Si/ZnO/CdO heterojunctions is fabricated. Thepotential barrierat ZnO/CdO interface reduces the possibility of recombination. The piezo-phototronic effect is used to enhance the performance of photodetectors.