Solution-Processed Photoconductive UV Detectors Based on ZnO Nanosheets

Author

Amini, Elham ; Dolatyari, Mahboubeh ; Rostami, Ali ; Shekari, Hemayat ; Baghban, Hamed ; Rasooli, Hassan ; Miri, Somayeh

Author_Institution

Sch. of Eng.-Emerging Technol., Univ. of Tabriz, Tabriz, Iran

Volume

24

Issue

22

fYear

2012

Firstpage

1995

Lastpage

1997

Abstract

A low-cost and complexity-free demonstration of two relatively fast ultraviolet (UV) detectors based on ZnO nanosheets are reported in this letter for the first time. Highly crystalline ZnO nanosheets have been synthesized by a sonochemical method. The proposed UV detectors were fabricated through coating the synthesized materials on Cu electrodes. Experimentally obtained responsivity, detectivity, absorption, and I-V characteristics along with the quantum efficiency are reported. Comparison of the conventional ZnO photo-sensors with nanoparticle-based ones reveals that the proposed nanosheets photosensors have faster response time in the UV region, which might be attributed to low density of defect states (created during synthesis process) on nanosheets surfaces.

Keywords

II-VI semiconductors; nanofabrication; nanoparticles; nanosensors; photodetectors; ultraviolet detectors; ultraviolet spectra; visible spectra; wide band gap semiconductors; zinc compounds; Cu; I-V characteristic; ZnO; absorption; coating; copper electrode; crystalline nanosheet surface; defect states; detectivity; nanoparticle based sensors; nanosheet photosensor; quantum efficiency; responsivity; solution-processed photoconductive UV detector; sonochemical method; ultraviolet detector; Absorption; Acoustics; Detectors; Materials; Nanoparticles; Time factors; Zinc oxide; Nanomaterials; Ultrasonic; ZnO; ultraviolet (UV) detectors;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2217375

Filename

6313889