Piezo-phototronic effect modulated self-powered UV/visible/near-infrared photodetectors based on CdS:P3HT microwires. (April 2017)

• Record Type: Journal Article
• Authors: Yu, Xiang-Xiang; Yin, Hong; Li, Hai-Xia; Zhang, Wei; Zhao, Han; Li, Chong; Zhu, Ming-Qiang
• Is Part Of: Nano energy. Volume 34(2017:Apr.)
• Page Start: 155
• Page End: 163
• Publication Date: 2017-04
• Subjects: UV/visible/near-infrared -- Photodetector -- Self-powered -- Piezo-phototronic effect -- P-n junction; 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.2017.02.033
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: A kind of high-performance self-powered broad-band photodetectors throughout UV/visible/near-infrared wavelengths have been fabricated based on CdS:P3HT microwires. The fabricated devices exhibit fast responses and excellent sensitivities to UV/visible/near infrared light illumination at zero bias. Together with the fast response and high sensitivity, the photocurrent under UV illumination can be increased to more than 330% when applying a 0.67% tensile strain under the [001] direction point of CdS microwire contacting with P3HT. This enhancement through the piezo-phototronic effect can be attributed to the increase of built-in field at the interface of p-n junction, which is favorable to the separation of photogenerated electron-hole pairs in CdS and P3HT. In comparison, the photocurrent under UV illumination can be decreased to ~ 20% when applying a 0.67% tensile strain under the [00 1 ¯ ] direction point of CdS microwire which contacts with P3HT. This research not only focuses on the photoelectric property of organic-inorganic hybrid semiconductors, but also combines it with piezoelectric effect to modulate the performance of optoelectronic devices made of piezoelectrical semiconducting materials. Graphical abstract: Self-powered UV/visible/near infrared broadband photodetectors have been fabricated based on CdS microwire and P3HT. The efficient photodetection can be enhanced or suppressed by external strains depending on two different CdS microwire/P3HT connection structures. Highlights: The CdS microwire and P3HT have been used to fabricate a self powered photodetector. The photodetector can detect light illumination from UV to near infrared. The currents can be enhanced under UV/visible radiation by applying tensile strains.