NDLI: Mg$_{ x }$Zn$_{1−x }$O Thin-Film Transistor-Based UV Photodetector with Enhanced Photoresponse

Content Provider	Springer Nature Link
Author	Ku, Chieh Jen Reyes, Pavel Duan, Ziqing Hong, Wen Chiang Li, Rui Lu, Yicheng
Copyright Year	2015
Abstract	ZnO and its ternary alloy Mg$_{ x }$Zn$_{1−x }$O (MZO) are promising wide-band-gap semiconductor materials well-suited to UV detection. The Mg content of MZO facilitates energy band gap engineering, enabling fabrication of UV photodetectors that can operate in the deep-UV region. Different types of UV photodetector based on ZnO have been reported, including photoconductive, Schottky, and transistor types. Transistor-based photodetectors have the advantage of being three-terminal devices, thus enabling biasing control and implementation in addressable arrays. In this paper we report an MZO thin-film-transistor (TFT)-based UV photodetector. The device has a low dark current (2 × 10$^{−14}$ A) and an ON/OFF ratio of 10$^{11}$. We show that by using a small amount of Mg (5%) in the MZO TFT we can substantially improve the photoresponse recovery time of the photodetector to 15 ms compared with 42 ms for a similar TFT with 0% Mg. We also observed a shift in the cutoff wavelength from 377.21 nm for the 0% Mg TFT photodetector down to 370.96 nm for the MZO TFT photodetector. We attribute the enhanced recovery time improvement of the MZO TFT UV photodetector to suppression of oxygen vacancies as a result of incorporation of the Mg in the MZO.
Starting Page	3471
Ending Page	3476
Page Count	6
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	44
Issue Number	10
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2015-03-06
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MgZnO ZnO thin-film transistors UV photodetectors Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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