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Proceedings Paper

Solid-phase crystallization of evaporated silicon thin films on glass for photovoltaics: a combined SEM and TEM study
Author(s): Fude Liu; M. J. Romero; K. M. Jones; M. M. Al-Jassim; O. Kunz; J. Wong; A. G. Aberle
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Paper Abstract

The material-quality limiting factors of evaporated solid-phase crystallized (SPC) poly-Si thin films fabricated on planar glass for photovoltaic applications are investigated by a study combining scanning electron microscopy and transmission electron microscopy. The grains in the investigated thin films are found to be randomly oriented, with an average grain size of ~2.1 μm. In general, the grains are found to have a high defect density, although some grains are more defective than others. We also observe a high level of impurity incorporation, in particular, oxygen, into the film. The optical activity of the Si films is dominated by deep band tail states. We conclude that the high intragrain defect densities and the high impurity levels are two major limiting factors for obtaining high-quality evaporated SPC poly-Si thin films for photovoltaics.

Paper Details

Date Published: 21 August 2009
PDF: 8 pages
Proc. SPIE 7409, Thin Film Solar Technology, 740906 (21 August 2009); doi: 10.1117/12.823622
Show Author Affiliations
Fude Liu, National Renewable Energy Lab. (United States)
M. J. Romero, National Renewable Energy Lab. (United States)
K. M. Jones, National Renewable Energy Lab. (United States)
M. M. Al-Jassim, National Renewable Energy Lab. (United States)
O. Kunz, Univ. of New South Wales (Australia)
J. Wong, Univ. of New South Wales (Australia)
A. G. Aberle, Univ. of New South Wales (Australia)


Published in SPIE Proceedings Vol. 7409:
Thin Film Solar Technology
Alan E. Delahoy; Louay A. Eldada, Editor(s)

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