Ultraviolet photodetectors based on ZnO sheets: The effect of sheet size on photoresponse properties

被引：75

作者：

Ardakani, Abbas Ghasempour ^{[1
]}

Pazoki, Meysam ^{[1
]}

Mahdavi, Seyed Mohammad ^{[1
,2
]}

Bahrampour, Ali Reza ^{[1
]}

Taghavinia, Nima ^{[1
,2
]}

机构：

[1] Sharif Univ Technol, Dept Phys, Tehran, Iran

[2] Sharif Univ Technol, Inst Nanosci & Nanotechnol, Tehran, Iran

来源：

APPLIED SURFACE SCIENCE | 2012年 / 258卷 / 14期

关键词：

ZnO sheets; UV photodetector; Electrodeposition; Response time; THIN-FILMS; GROWTH; NANOSTRUCTURES; NANOSHEETS; MECHANISM; SENSOR;

D O I：

10.1016/j.apsusc.2012.02.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, ultraviolet photodetectors based on electrodeposited ZnO sheet thin films were fabricated on a glass substrate. Before electrodeposition, a thin buffer layer of ZnO was deposited on the glass by pulsed laser deposition method. This layer not only acted as a nucleation site for ZnO sheet growth, but also made it possible to use cheap glass substrate instead of conventional fluorine-doped tin oxide (FTO) substrate. Our results showed that photoresponse properties of the photodetectors strongly depend on the sheet sizes. The smaller sheets exhibited enhanced photosensitivity, shortened fall times and decreased gain compared to larger ones. We showed that photodetectors based on ZnO sheets have a faster response than ones based on polycrystalline films. It was also shown that even less response time could be obtained by using comb-like electrodes instead of two-electrode. (C) 2012 Elsevier B. V. All rights reserved.

引用

页码：5405 / 5411

页数：7

共 34 条

[1] Synthesis of zinc oxide nanosheet thin films and their improved field emission and photoluminescence properties by annealing processing [J].