Time evolution of surface defect states in hydrogenated amorphous silicon studied by photothermal and photocurrent spectroscopy and optical simulation

The time evolution of surface defect density and width of space charge region in thin layer of amorphous silicon is observed experimentally by Fourier transform photocurrent spectroscopy. This work reviews the assumption that photocurrent is insensitive to surface defects for samples thinner than 1500 nm. We show that correct evaluation based on simple optical model comprising layers representing surface defects and layers representing space charge region with reduced collection allows obtaining the same results as from photothermal deflection spectroscopy. Our main approach is the comparison of photocurrent or photothermal deflection spectra measured in absorptance/transmittance mode from layer and substrate side of the thin film. (C) 2011 Elsevier B.V. All rights reserved.


Published in:
Journal Of Non-Crystalline Solids, 358, 17, 2035-2038
Presented at:
24th International Conference on Amorphous and Nanocrystalline Semiconductors (ICANS)
Year:
2012
Publisher:
Amsterdam, Elsevier Science Bv
ISSN:
0022-3093
Keywords:
Note:
IMT-NE Number : 698
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2013-02-27, last modified 2018-03-17

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