ENERGY CONVERSION DEVICE FOR PHOTOVOLTAIC CELLS
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United States of America Patent
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Issued Date -
Mar 15, 2012
app pub date -
Aug 16, 2011
filing date -
Aug 16, 2010
priority date (Note) -
Abandoned
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Abstract
An energy conversion device is provided for use, for example, in a photovoltaic solar cell. The device includes an up conversion composite material disposed in cavities in a semiconductor material or in a heat spreader bonded to the solar cell. The up conversion composite material is formed from a mixture of at least two different up conversion materials formed as crystal grains dispersed within an optically transmitting dispersion medium. The up conversion materials may include a crystal material doped with dopant atoms capable of absorbing photons having wavelengths longer than an absorption edge of the semiconductor material and emitting photons having wavelengths shorter than the absorption edge. In this manner, more photons can be utilized in the solar cell and optical coupling between the semiconductor material and the up conversion material is increased,
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