Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 11, Issue 11, Pages 2220-2224Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.09.035
Keywords
QDs-solar cells; TiO2 nanofibrous; CdS QDs; CdSe QDs; Quantum efficiency
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Funding
- Nano RD Program [2007-02866]
- Ministry of Education, Science, and Technology, Korea [R11-2008-088-01001-0]
- National Research Foundation of Korea [R11-2008-088-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Highly porous networks and reduced grain boundaries with one-dimensional (1-D) nanofibrous morphology offer enhanced charge transport in solar cells applications. Quantum dot (QDs) decorated TiO2 nanofibrous electrodes, unlike organic dye sensitizers, can yield multiple carrier generations due to the quantum confinement effect. This paper describes the first attempt to combine these two novel approaches, in which US (similar to 18 nm) and CdSe (similar to 8 nm) QDs are sensitized onto electrospun TiO2 nanofibrous (diameter similar to 80-100 nm) electrodes. The photovoltaic performances of single (CdS and CdSe) and coupled (CdS/CdSe) QDs-sensitized TiO2 fibrous electrodes are demonstrated in sandwich-type solar cells using polysulfide electrolyte. The observed difficulties in charge injection and lesser spectral coverage of single QDs-sensitizers; are solved by coupling (CdS:CdSe) two QDs-sensitizers, resulting in a enhanced open-circuit voltage (0.64 V) with 2.69% efficiency. These results suggest the versatility of fibrous electrodes in QDs-sensitized solar cell applications. (C) 2009 Elsevier B.V. All rights reserved.
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