Quantum dot solar cells (QDSCs) have drawn increased interest in recent years their ability to tune semiconductor bandgap, high extinction coefficients, large molecular dipoles and the potential for multi-layer sensitization. {Kamat, 2008 #7893; Mora-Sero, 2010 #8962} The composite of CdSe quantum dot (QD) and graphene oxide has been successfully employed in quantum dot solar cells. The paper discusses excited state interaction between CdSe and graphene oxide and its manipulation to achieve improved efficiency of solar cells. Upon photoexcitation, CdSe QDs undergo electron transfer to GO resulting in reduction and electron storage. Relative rates of electron and energy transfer from CdSe QDs to GO were determined by comparing differences in CdSe-GO PL lifetime characteristics before and after prolonged illumination.
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