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Proceedings Paper

Up- and down-conversion materials for photovoltaic devices
Author(s): Bryce S. Richards; Aruna Ivaturi; Sean K. W. MacDougall; Jose Marques-Hueso
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Paper Abstract

Up-conversion (UC) and down-conversion (DC) of sunlight are two possible routes for improving energy harvesting over the whole solar spectrum. Via such processes it could be possible to exceed the Shockley-Queisser limit for a single-junction photovoltaic (PV) device. The effect of adding DC and UC layers to the front and rear of a solar cell, respectively, is to modify the incident solar spectrum. One of the materials more extensively studied for these propose have been the lanthanides or rare-earth systems, due to the suitability of their discrete energy levels for photon conversion inside a wide variety of host materials. While high quantum yields of 200% have been demonstrated with DC materials, there remain several barriers to realising such a layer that is applicable to a solar cell. These are, firstly, weak absorption of the lanthanide ions and, secondly, the competing loss mechanism of non-radiative recombination. For UC, these two barriers still exist, however an additional challenge is the non-linear nature of the UC process, thus favouring operation under concentrated sunlight. In this paper, we review the application of UC and DC to PV, discussing the material systems used and optical characterisation.

Paper Details

Date Published: 24 April 2012
PDF: 8 pages
Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 843802 (24 April 2012); doi: 10.1117/12.923298
Show Author Affiliations
Bryce S. Richards, Heriot-Watt Univ. (United Kingdom)
Aruna Ivaturi, Heriot-Watt Univ. (United Kingdom)
Sean K. W. MacDougall, Heriot-Watt Univ. (United Kingdom)
Jose Marques-Hueso, Heriot-Watt Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 8438:
Photonics for Solar Energy Systems IV
Ralf Wehrspohn; Andreas Gombert, Editor(s)

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