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Optical Properties of i-Layers as a Function of Growth Rate in Correlation to the Performance of a-Si:H Solar Cells

Published online by Cambridge University Press:  01 February 2011

Keda Wang ,
Jessica M. Owens ,
Jennifer Weinberg-Wolf ,
Daxing Han  and
Lynn Gedvilas
Keda Wang
Affiliation:
Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255
Jessica M. Owens
Affiliation:
Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255
Jennifer Weinberg-Wolf
Affiliation:
Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255
Daxing Han
Affiliation:
Department of Physics & Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255
Lynn Gedvilas
Affiliation:
National Renewable Energy Laboratory, Golden, CO Gautam Ganguly, BPSolar, 3600, LaGrange Parkway, Toano, VA 23168
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Abstract

a-Si:H intrinsic films and their solar cells were prepared by DC-PECVD with growth rates of 1, 3, and 10 Å/s. Raman, IR, and PL spectroscopies were used to study the i-layer properties in relation to the solar cell performance. Raman shows an identical TO mode for all the samples, which indicates the local silicon-bonding configuration does not change with the growth rate from 1 to 10 Å/s. IR results show that the hydrogen bonding configuration is monohydride (Si-H) dominated, and the hydrogen content obtained from the 630 cm-1 wagging mode is 12-14 at.%. Surprisingly, a very small absorption strength for the stretching 2000-2100 cm-1 mode was found for some samples deposited at the higher growth rates (3, 10 Å/s). For these same samples, the PL spectra exhibit a red shift. Both the IR and PL results might be related to the same microstructures formed at high growth rates. We found that although the properties of the i-layer varied as the growth rate increased from 1 to 10 Å/s, the performances of the cells were comparable (within about 4%).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 715: Symposium A – Amorphous and Heterogeneous Silicon-Based Films-2002 , 2002 , A6.4
Copyright
Copyright © Materials Research Society 2002

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