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Influence of Surface Recombination on the Performance of SiNW Solar Cells and the Preparation of a Passivation Film

Published online by Cambridge University Press:  21 February 2013

Shinya Kato
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1-NE-16, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
Yuya Watanabe
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1-NE-16, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
Yasuyoshi Kurokawa
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1-NE-16, O-okayama, Meguro-ku, Tokyo 152-8552, Japan PRESTO, Japan Science and Technology Agency (JST), Japan
Akira Yamada
Affiliation:
Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1-NE-16, O-okayama, Meguro-ku, Tokyo 152-8552, Japan Photovoltaics Research Center (PVREC), Japan
Yoshimi Ohta
Affiliation:
Advanced Materials Laboratory, Nissan Research Center, Japan
Yusuke Niwa
Affiliation:
Advanced Materials Laboratory, Nissan Research Center, Japan
Masaki Hirota
Affiliation:
Advanced Materials Laboratory, Nissan Research Center, Japan
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Abstract

Al2O3 was deposited on silicon nanowire (SiNW) arrays by atomic layer deposition (ALD) as a passivation layer to reduce surface recombination velocity. As a result, effective minority carrier lifetime was improved from 1.82 to 26.2 μs. From this result, the relative low-surface recombination rate of 2.73 cm/s was obtained from a calculation using one-dimensional device simulation (PC1D). The performance of SiNW solar cells was also simulated by considering the surface recombination velocity on the side of SiNWs using two-dimensional device simulation. It was found that Al2O3 deposited by ALD can improve open-circuit voltage of SiNW solar cells even if the structure has a high-aspect ratio and large surface area. Therefore, improvement in the performance of SiNW solar cells can be expected.

Type
Articles
Copyright
Copyright © Materials Research Society 2013

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