Improving the Optical Efficiency and Concentration of a Single-plate Quantum Dot Solar Concentrator using Infra-red Emitting Quantum Dots

Manus Kennedy, Dublin Institute of Technology
Sarah McCormack, Dublin Institute of Technology
J. Doran, Dublin Institute of Technology
Brian Norton, Dublin Institute of Technology

Document Type Article

Published in Solar Energy, Vol.83, No. 7, pp.978-981, 2009 Available from


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 not, vert, similar57% of incident photons absorbed in QDSCs containing commercially-available visible-emitting QDs.