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Beyond the Yablonovitch limit: trapping light by frequency shift

By Tom Markvart

Abstract

It is shown that randomising the photon distribution over the frequency as well as orientation variables dramatically improves the efficiency of optical confinement in a weakly absorbing material such as crystalline silicon. The enhancement in average optical path length over the Yablonovitch limit [E. Yablonovitch, J. Opt. Soc. Am. 72, 899 (1982)] is given by an inverse Boltzmann factor of the frequency shift, making it possible to manufacture, for example, efficient crystalline silicon solar cells of thickness barely 1 micromete

Topics: QC
Year: 2011
OAI identifier: oai:eprints.soton.ac.uk:176569
Provided by: e-Prints Soton

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