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20 August 2009 Light harvesting in hybrid epitaxial/colloidal nanostructures
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The performance of light harvesting devices is improved by utilising resonance energy transfer. A hybrid structure of colloidal quantum dots (QDs) and a quantum well (QW) p-i-n heterostructure is investigated. After highly absorbing QDs absorb photons, the excitations are efficiently transferred to a QW p-i-n heterostructure via resonance energy transfer. The generated electron-hole pairs in the heterostructure are subsequently separated by the built-in electric field and collected by the corresponding electrodes. In order to increase the energy transfer rate, the donor-acceptor separation distance is minimised by fabricating channel structures on the heterostructure surface penetrating its active layers. Consequently, a six-fold enhancement of photocurrent conversion efficiency is demonstrated. The proposed hybrid structures offer efficient light harvesting devices where high absorption of the colloidal QDs is utilised and their low charge transfer is overcome.
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Pavlos G. Lagoudakis and Soontorn Chanyawadee "Light harvesting in hybrid epitaxial/colloidal nanostructures", Proc. SPIE 7411, Nanoscale Photonic and Cell Technologies for Photovoltaics II, 741107 (20 August 2009);

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