NDLI: Potentials and development of amorphous silicon carbide heterojunction solar cells

Content Provider	IEEE Xplore Digital Library
Author	Pysch, D. Ziegler, J. Becker, J.-P. Suwito, D. Janz, S. Glunz, S.W. Hermle, M.
Copyright Year	2009
Description	Author affiliation: Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany (Pysch, D.; Ziegler, J.; Becker, J.-P.; Suwito, D.; Janz, S.; Glunz, S.W.; Hermle, M.)
Abstract	In this paper the potential of amorphous silicon carbide used as an emitter for silicon heterojunction solar cells is presented. Especially the annealing behaviour of the open-circuit voltage V of n-doped amorphous silicon carbide heterojunction emitter solar cells is investigated in detail. We present our results of a significant open-circuit voltage improvement of more than 100 mV on both a flat and a textured front surface triggered by thermal annealing on a hot plate. The observed open-circuit voltage behaviour can be described best by a stretched exponential function, which in general describes relaxation rates in complex systems. Further we investigated the optimum conditions of a post deposition annealing step in order to reach the highest efficiency. During this analysis we also observed deterioration in solar cell performance when the structure is annealed for a very long time. In conclusion, we suppose that a diffusion of weakly bonded or free hydrogen, activated by the annealing which saturates dangling bonds in the amorphous layer itself and most likely more important at the heterojunction interface, is responsible for the strong improvement in V and efficiency.
Starting Page	000794
Ending Page	000799
File Size	4364952
Page Count	6
File Format	PDF
ISBN	9781424429493
ISSN	01608371
DOI	10.1109/PVSC.2009.5411165
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Amorphous silicon Heterojunctions Photovoltaic cells Annealing Voltage Surface texture Performance analysis Diffusion bonding Hydrogen Amorphous materials
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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