title: Improved Photoresponse Performance of Self-Powered ZnO/Spiro-MeOTAD Heterojunction Ultraviolet Photodetector by Piezo-Phototronic Effect.
abstract: Strain-induced piezoelectric potential (piezopotential) within wurtzite-structured ZnO can engineer the energy-band structure at a contact or a junction and, thus, enhance the performance of corresponding optoelectronic devices by effectively tuning the charge carriers' separation and transport. Here, we report the fabrication of a flexible self-powered ZnO/Spiro-MeOTAD hybrid heterojunction ultraviolet photodetector (UV PD). The obtained device has a fast and stable response to the UV light illumination at zero bias. Together with responsivity and detectivity, the photocurrent can be increased about 1-fold upon applying a 0.753% tensile strain. The enhanced performance can be attributed to more efficient separation and transport of photogenerated electron-hole pairs, which is favored by the positive piezopotential modulated energy-band structure at the ZnO-Spiro-MeOTAD interface. This study demonstrates a promising approach to optimize the performance of a photodetector made of piezoelectric semiconductor materials through straining.
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Yanwei
authors.initials: Y
authors.lastname: Shen
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Xiaoqin
authors.initials: X
authors.lastname: Yan
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Haonan
authors.initials: H
authors.lastname: Si
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Pei
authors.initials: P
authors.lastname: Lin
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Yichong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Yihui
authors.initials: Y
authors.lastname: Sun
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.|Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing , Beijing 100083, People's Republic of China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhang
keywords: ZnO/Spiro-MeOTAD heterojunction; flexible; piezo-phototronic effect; self-powered; ultraviolet photodetector