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01321 am a22001693u 4500 |
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|a Markvart, Tomas
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|a Danos, Lefteris
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|a Fang, Liping
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|a Parel, Thomas
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|a Soleimani, Nazila
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|a Photon frequency management for trapping & concentration of sunlight
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|c 2012-01-30.
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|z Get fulltext
|u https://eprints.soton.ac.uk/334194/1/c2ra01160c
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|a This paper considers a range of techniques which - within the realm of classical optics - can be used to enhance light capture as a first step in photovoltaic energy conversion. Examples include a simple case of downshifting, fluorescent collectors which reduce the size of a light beam, and a novel form of light trapping to increase the path length of light within the solar cell. The results are discussed using a thermodynamic framework where the energy exchange with an absorbing/fluorescent medium allows the entropy of the captured photon gas to be lowered, reducing the étendue of the emitted beam. We show that frequency management represents a powerful tool, allowing enhancement in light trapping above the Yablononovitch limit, leading to potentially highly efficient but very thin crystalline silicon solar cells.
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