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ZnO-CdS Core Shell Quantum Dots Sensitized Solar Cell: Influence of Crystalline and Amorphous CdS Structures in Photovoltaic Performance

Title
ZnO-CdS Core Shell Quantum Dots Sensitized Solar Cell: Influence of Crystalline and Amorphous CdS Structures in Photovoltaic Performance
Author
한성환
Keywords
ZnO; CdS Quantum Dots; Crystallinity; Quantum Dots-Sensitized Solar Cell
Issue Date
2011-06
Publisher
AMER SCIENTIFIC PUBLISHERS
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, July 2011, 11(7), P.6550-6554, 5P.
Abstract
ZnO nanoparticles (NPs) coated with amorphous and crystalline CdS quantum dots (QDs) were successfully synthesized through chemical bath deposition (CBD) process. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) have been utilized to characterize the samples morphology and structural properties. The conduction band of CdS QDs is much higher than the ZnO conduction band facilitates electron transfer process through cascade system. The thickness and crystallinity of the CdS QDs coated on ZnO NPs critically controls the electron diffusion length and photovoltaic performance of the solar cell. The red shift from 506 to 524 nm, increased optical absorption in the UV-visible range and electron diffusion length limited by the thickness of the amorphous/crystalline CdS QDs coated on ZnO NPs film, influences the performance of the QDs sensitized solar cell (QDSSCs) under one sun illumination intensity (AM 1.5, 100 mW/cm(2)). The results discuss the CBD process controlled growth of CdS QDs on ZnO NPs and its influence on the photovoltaic performance of QDSSCs.
URI
http://www.ingentaconnect.com/content/asp/jnn/2011/00000011/00000007/art00179http://hdl.handle.net/20.500.11754/66674
ISSN
1533-4880
DOI
10.1166/jnn.2011.4395
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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