Optical absorption spectrum of hydrogenated amorphous silicon using photo-pyroelectric spectroscopy

J. Fan, J. Kakalios

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Abstract

The optical absorption coefficient α of doped and undoped hydrogenated amorphous silicon (a-Si:H) has been measured for photon energies from 2.2 to 1.0 eV using photo-pyroelectric spectroscopy (PPES). A simplified experimental setup and analysis for extracting α from the PPES data are described. In PPES the temperature rise induced in the a-Si:H thin film due to weakly absorbed light is detected via a pyroelectric polymer in thermal contact with the sample. This technique presently has a sensitivity of αd≳10-3, where d is the sample thickness.

Original languageEnglish (US)
Pages (from-to)1799-1804
Number of pages6
JournalJournal of Applied Physics
Volume74
Issue number3
DOIs
StatePublished - 1993

Bibliographical note

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Copyright 2010 Elsevier B.V., All rights reserved.

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