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The role of ZnO-coating-layer thickness on the recombination in CdS quantum-dot-sensitized solar cells

Title
The role of ZnO-coating-layer thickness on the recombination in CdS quantum-dot-sensitized solar cells
Author
김영호
Keywords
Quantum-dot-sensitized solar cells; Cadmium sulfide; Coating; Zinc oxide; Solar cells
Issue Date
2013-11
Publisher
ELSEVIER SCIENCE BV
Citation
NANO ENERGY, 권: 2, 호: 6, 페이지: 1218-1224
Abstract
To prevent recombination at the interface of TiO2/polysulfide-electrolyte, a ZnO layer was deposited on a TiO2 electrode. The optimized ZnO-coated solar cell exhibited a 32% increase in the power-conversion efficiency compared to the bare cell. The coating layer acts as an energy barrier, which plays an important role in reducing the charge recombination from the TiO2 electrode to the electrolyte. Moreover, CdS quantum-dot adsorption was enhanced by employing the ZnO-coated layer. The thicker ZnO layer (more than 8-cycle deposition), however, led to a less porous electrode, as confirmed by electrolyte diffusivity, and also deteriorated the cell efficiency by introducing defect states verified by electron lifetime and chronoamperometric reduction current. (C) 2013 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S2211285513000888?via%3Dihubhttp://hdl.handle.net/20.500.11754/46300
ISSN
2211-2855
DOI
10.1016/j.nanoen.2013.05.007
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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