Hole drift-mobility measurements in microcrystalline silicon

T. Dylla, F. Finger, E. A. Schiff

Research output: Contribution to journalArticle

54 Scopus citations

Abstract

We have measured transient photocurrents on several p-i-n solar cells based on microcrystalline silicon. For two of these samples, we were able to obtain conclusive hole drift-mobility measurements. Despite the predominant crystallinity of these samples, temperature-dependent measurements were consistent with an exponential-bandtail trapping model for transport, which is usually associated with noncrystalline materials. We estimated valence bandtail widths of about 31 meV and hole band mobilities of 1-2 cm2 V s. The measurements support mobility-edge transport for holes in these microcrystalline materials, and broaden the range of materials for which mobility-edge transport corresponds to an apparently universal band mobility of order 1 cm2 V s.

Original languageEnglish (US)
Article number032103
JournalApplied Physics Letters
Volume87
Issue number3
DOIs
StatePublished - Jul 18 2005

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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