Home > Research > Publications & Outputs > Photon frequency management for trapping & conc...
View graph of relations

Photon frequency management for trapping & concentration of sunlight

Research output: Contribution to journalJournal article

Published
Close
<mark>Journal publication date</mark>30/01/2012
<mark>Journal</mark>RSC Advances
Issue number8
Volume2
Number of pages7
Pages (from-to)3173-3179
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

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.