Evaluation of the gap state distribution in a-Si:H by SCLC measurements

A. Eray, G. Nobile

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Abstract

In this work, the analysis of the current density-voltage (J-V) characteristics of a good-quality a-Si:H n+-i-n+structures has been studied as a function of temperature. The defect density within the intrinsic layer of the a-Si:H n+-i-n+structure was determined using the den Boer approach to the analysis of the space charge limited current (SCLC). The den Boer analysis yields the density of states (DOS) in only a limited part of the band gap of the sample. We emphasize that in a good-quality sample, even if it is a thin one, the den Boer approach to SCLC gives correct information about the DOS. This information comes from the states near the conduction band tail, which reside in the upper part of the gap, because of the smaller activation energy of thin samples. © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)521 - 528
Number of pages8
JournalSolar Energy Materials and Solar Cells
Volume76
Issue number4
DOIs
Publication statusPublished - 1 Apr 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films

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