Self-Powered UV Photosensor Based on PEDOT:PSS/ZnO Micro/Nanowire with Strain-Modulated Photoresponse

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• 作者：Pei Lin ; Xiaoqin Yan ; Zheng Zhang ; Yanwei Shen ; Yanguang Zhao ; Zhiming Bai ; Yue Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：May 8, 2013
• 年：2013
• 卷：5
• 期：9
• 页码：3671-3676
• 全文大小：364K
• 年卷期：v.5,no.9(May 8, 2013)
• ISSN：1944-8252

文摘

Developing tailored micro/nanostructure interfaces is an effective way to make novel optoelectronic devices or enhance their performances. Here we report the fabrication of a PEDOT:PSS/ZnO micro/nanowire-based self-powered UV photosensor. The generation of photocurrent at zero bias is attributed to the separation of photogenerated electron鈥揾ole pairs within the built-in electric field at the PEDOT:PSS/ZnO interface upon UV light illumination. Furthermore, the piezotronic effect on the UV photoresponsivity under different strains is investigated, which is due to the modification of energy band diagram at the p鈥搉 heterojunction by strain-induced piezoelectric polarization. This study demonstrates a prospective approach to engineering the performance of a photodetector through straining and may offer theoretical supporting in future optoelectronic device fabrication and modification.

Keywords:

self-powered; UV photodetector; p鈭抧 junction; interface modulation; strain