Low frequency noise in hydrogenated p-type amorphous silicon thin films

被引:11
作者
Lopes, V. C. [1 ]
Syllaios, A. J. [1 ]
Littler, C. L. [1 ]
机构
[1] Univ North Texas, Dept Phys, Denton, TX 76203 USA
关键词
Amorphous silicon; 1/f noise; Low frequency noise; Mott variable range hopping; Hydrogen dilution; Boron dopant; HOPPING CONDUCTION; LOCALIZED STATES; 1/F NOISE; FLUCTUATIONS; SI;
D O I
10.1016/j.jnoncrysol.2017.01.014
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report on electrical noise measurements of p-type a-Si:H thin films prepared by plasma enhanced chemical vapor deposition. Samples were grown at various boron concentrations and hydrogen dilution of the silane precursor. Measurements were made at temperatures ranging from 210 K to 450 K. In this temperature range, Mott variable range hopping conduction describes the electrical conductivity, and the noise has a 1/17 component. The exponent gamma for temperatures below 400 K is approximately 1, and the noise follows the Hooge model. For temperatures between 240 K and 380 K, the 1/f noise was found to be independent of the conductivity. Therefore, the carrier concentration does not change appreciably with temperature and the change in conductivity is due to the temperature dependence of the hole mobility. The normalized Hooge parameter correlates with the Mott hopping parameter, Tom, and in turn, to the material dopant boron concentration and hydrogen dilution levels. For temperatures above 400 K, the frequency exponent, y, is larger than 1, indicative of a generation-recombination trap contribution to the noise. From the dependence of the normalized Hooge parameter to the Mott characteristic temperature Tom, we conclude that the electrical 1/f noise in p-type a-Si:H is associated with hopping conduction. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:176 / 183
页数:8
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