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3 October 2005 Nanocomposite solar cells based on conjugated polymer / PbSe quantum dot
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We report a novel type of nanocomposite of conjugated polymer (regio-regular polythiophene) with infrared-sensitive, PbSe quantum dots (QD), which have size-tunable lowest-energy absorption bands between 0.3 and 1 eV. Thin film devices show very good diode characteristics and sizable photovoltaic response with an open circuit voltage, Voc, of ~ 0.3-0.4 V and short circuit current density, Jsc, of ~ 0.2mA/cm2, which is significantly higher than recently reported in PbS QD-based devices. This is the evidence of a quite efficient photoinduced charge transfer between the polymer and QD, with infrared sensitivity. Photocurrent under reverse bias is significantly enhanced to Jph ~ 1 mA/cm2 indicating that the polythiophene/PbSe QD system can be used as effective infrared photodetectors. Detailed spectroscopic studies of photoresponse over a wide spectral range are presented. Quenching of photoluminescence by PbSe QDs has also been studied to gain more understanding of energy and charge transfer in this system.
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Xiaomei Jiang, Sergey B. Lee, Igor B. Altfeder, Anvar A. Zakhidov, Richard D. Schaller, Jeff M. Pietryga, and Victor I. Klimov "Nanocomposite solar cells based on conjugated polymer / PbSe quantum dot", Proc. SPIE 5938, Organic Photovoltaics VI, 59381F (3 October 2005);

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