Author:
Mishra S.K.,Srivastava R.K.,Prakash S.G.,Yadav R.S.,Panday A.C.
Abstract
AbstractIn the present paper, ZnO nanoparticles (NPs) with particle size of 20–50 nm have been synthesized by hydrothermal method. UV-visible absorption spectra of ZnO nanoparticles show absorption edge at 372 nm, which is blue-shifted as compared to bulk ZnO. Photoluminescence (PL) and photoconductive device characteristics, including field response, light intensity response, rise and decay time response, and spectral response have been studied systematically. The photoluminescence spectra of these ZnO nanoparticles exhibited different emission peaks at 396 nm, 416 nm, 445 nm, 481 nm, and 524 nm. The photoconductivity spectra of ZnO nanoparticles are studied in the UV-visible spectral region (366–691 nm). In spectral response curve of ZnO NPs, the wavelength dependence of the photocurrent is very close to the absorption and photoluminescence spectra. The photo generated current, Ipc = (Itotal - Idark) and dark current Idc varies according to the power law with the applied field IpcαVr and with the intensity of illumination IpcαIL r, due to the defect related mechanism including both recombination centers and traps. The ZnO NPs is found to have deep trap of 0.96 eV, very close to green band emission. The photo and dark conductivities of ZnO NPs have been measured using thick film of powder without any binder.
Subject
Electrical and Electronic Engineering,Radiation,General Materials Science
Reference34 articles.
1. Nano wire ultraviolet photodetectors and optical switches;Kind;Mater,2002
2. Sub bandgap photoconductivity in ZnO epilayers and extraction of trap density spectra Semi cond;Moazzami;Sci Tech,2006
3. Photoelectron spectroscopic study of CdS nanocrystallites;Nanda;Phys Rev B,1999
4. Quantum size effects on the exciton energy of CdS clusters;Wang;Phys Rev B,1990
5. and Optical and photoelectrical properties of ZnO thin films and the effects of annealing;Henseler;Cryst Growth,2006
Cited by
139 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献