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Transient photoconductivity studies of band tails states in compensated a-Si:H

Transient photoconductivity studies of band tails states in compensated a-Si:H

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Authors

  • D. M. Goldie

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Original languageEnglish
Pages130-135
Number of pages6
JournalJournal of Non-Crystalline Solids
Journal publication date2006
Journal number2
Volume353
DOIs
StatePublished

Abstract

The density of conduction band tail states has been determined for a series of compensated a-Si:H films using transient photoconductivity measurements. Relative to undoped material, the energy width of shallow tail states lying within 0.45 eV of the conduction band edge are found to be insensitive to the level of compensated doping for doping levels up to 1000 vppm. An observed reduction in photocurrent magnitude as the doping is increased is consistent with a corresponding reduction in the electron extended state mobility. The magnitude of the mobility reduction is found to be quantitatively consistent with potential fluctuations which arise from ionized dopants for compensated doping levels up to about 100 vppm.

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