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Improving the optical efficiency and concentration of a single-plate quantum dot solar concentrator using near infra-red emitting quantum dots

Authors
Journal
Solar Energy
0038-092X
Publisher
Elsevier
Publication Date
Volume
83
Issue
7
Identifiers
DOI: 10.1016/j.solener.2008.12.010
Keywords
  • Quantum Dot
  • Luminescent Solar Concentrator
  • Ray-Trace Modelling
Disciplines
  • Physics

Abstract

Abstract Low luminescent quantum yields and large overlap between quantum dot (QD) emission and absorption spectra of present commercially-available visible-emitting QDs have led to low optical efficiencies for single-plate quantum dot solar concentrators (QDSCs). It is shown that using near infra-red (NIR) emitting QDs, re-absorption of QD emitted photons can be reduced greatly, thereby diminishing escape cone losses thus improving optical efficiencies and concentration ratios. Using Monte-Carlo ray-trace modelling, escape cone losses are quantified for different types of QD. A minimum 25% escape cone loss would be expected for a plate with refractive index of 1.5 containing QDs with no spectral overlap. It is shown that escape cone losses account for ∼57% of incident photons absorbed in QDSCs containing commercially-available visible-emitting QDs.

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