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20 January 2012 Photovoltaic devices based on quantum dot functionalized nanowire arrays embedded in an organic matrix
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Quantum dot (QD) functionalized nanowire arrays are attractive structures for low cost high efficiency solar cells. QDs have the potential for higher quantum efficiency, increased stability and lifetime compared to traditional dyes, as well as the potential for multiple electron generation per photon. Nanowire array scaffolds constitute efficient, low resistance electron transport pathways which minimize the hopping mechanism in the charge transport process of quantum dot solar cells. However, the use of liquid electrolytes as a hole transport medium within such scaffold device structures have led to significant degradation of the QDs. In this work, we first present the synthesis uniform single crystalline ZnO nanowire arrays and their functionalization with InP/ZnS core-shell quantum dots. The structures are characterized using electron microscopy, optical absorption, photoluminescence and Raman spectroscopy. Complementing photoluminescence, transmission electron microanalysis is used to reveal the successful QD attachment process and the atomistic interface between the ZnO and the QD. Energy dispersive spectroscopy reveals the co-localized presence of indium, phosphorus, and sulphur, suggestive of the core-shell nature of the QDs. The functionalized nanowire arrays are subsequently embedded in a poly-3(hexylthiophene) hole transport matrix with a high degree of polymer infiltration to complete the device structure prior to measurement.
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Patrick Kung, Nicholas Harris, Gang Shen, David S. Wilbert, William Baughman, Soner Balci, Nabil Dawahre, Lee Butler, Elmer Rivera, David Nikles, and Seongsin M. Kim "Photovoltaic devices based on quantum dot functionalized nanowire arrays embedded in an organic matrix", Proc. SPIE 8268, Quantum Sensing and Nanophotonic Devices IX, 82680S (20 January 2012);

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