LIGHT ABSORBING MATERIAL AND PHOTOELECTRIC CONVERSION ELEMENT
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United States of America Patent
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Issued Date -
Jan 10, 2013
app pub date -
Mar 16, 2011
filing date -
Mar 18, 2010
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Abstract
A new light-absorbing material which can increase the conversion efficiency of a solar cell and a photoelectric conversion element using same are provided. The light-absorbing material of the present invention comprises a nitride-based compound semiconductor obtained by replacement of part of Al and/or Ga in a compound semiconductor expressed by a general formula Al1−yGayN (0≦y≦1) by at least one kind of 3d-transition metals, the nitride-based compound semiconductor having one or more impurity bands between a valence band and a conduction band, and whose light absorption coefficient over an overall wavelength region of not longer than 1500 nm and not shorter than 300 being not lower than 1000 cm−1.
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