Nonradiative resonance energy transfer directed from colloidal CdSe/ZnS quantum dots to epitaxial InGaN/GaN quantum wells for solar cells

We report on Forster-type nonradiative resonance energy transfer (NRET) directed from colloidal quantum dots (QDs) to expitaxial qantum wells (QWs) with an efficiency of 69.6% at a rate of 1.527 ns(-1) for potential application in III-nitride based photovoltaics. this hybrid exciton generation-collection system consists of chemically-synthesized CdSe/Zns core/shell QDs (lambda(PL)= 490nm) intimately integrated on epitaxilly grown green. InGaN/GaN QWs (lambda(PL) = 512 nm). To demonstrate direction NRET from donor QDs to acceptor QWs. we simultaneously show the decreased photoluminescence decay lifetime of dots and ncreased lifetime of wells in the hybrid dipole-dipole coupled system. (C)2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim