Isotropy of drift mobilities in hydrogenated amorphous silicon

Homer Antoniadis, E. A. Schiff

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

We report transient photocurrent and time-of-flight measurements in undoped hydrogenated amorphous silicon (a-Si:H) for photocarrier motion both parallel and perpendicular to the thin-film growth axis. These measurements were analyzed to obtain the electron drift mobility and deep-trapping mobility-lifetime product at room temperature. We found good agreement of the electron-drift- mobility measurements for both field directions in two specimens prepared in several light-soaking states. Fifteen pairs of mobility-lifetime product estimates for the two field directions were also measured in a larger number of specimens. The data exclude an electron-transport anisotropy in a-Si:H greater than a factor of 2 in our specimens. We also studied the effects of absorption depth upon estimates of deep-trapping mobility-lifetime products for the standard sandwich electrode structure; results using 520-nm illumination yield estimates that are typically half the value estimated with uniformly absorbed illumination. We also present data on the correlation of the electron and hole deep-trapping mobility-lifetime products for these specimens.

Original languageEnglish (US)
Pages (from-to)3627-3637
Number of pages11
JournalPhysical Review B
Volume44
Issue number8
DOIs
StatePublished - Jan 1 1991

ASJC Scopus subject areas

  • Condensed Matter Physics

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