Sublinear photoconductivity in n-type a-Si:H — analysis and computer modelling

In this paper an approach is suggested to examine photoconductivity in n-type a-Si:H, in which band tails are required to play an important role as reservoirs of trapped charge but do not provide a significant recombination path. The model arises from observations of steady state photoconductivity i...

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Bibliographic Details
Published inJournal of non-crystalline solids Vol. 198; pp. 263 - 266
Main Authors Main, C., Dick, F., Reynolds, S., Gao, W., Gibson, R.A.G.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1996
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Summary:In this paper an approach is suggested to examine photoconductivity in n-type a-Si:H, in which band tails are required to play an important role as reservoirs of trapped charge but do not provide a significant recombination path. The model arises from observations of steady state photoconductivity in n-type a-Si:H which reveal sublinear behaviour of photocurrent δ I extending several orders of magnitude below the ‘dark’ current I O. This is unexpected behaviour, since most models predict linearity for small-signal conditions. Computer simulations using the suggested model reproduce this behaviour and also fit the observed temperature dependence of the index, γ.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(95)00710-5