NDLI: ZnO/TiO<sub>2</sub> nanocable structured photoelectrodes for CdS/CdSe quantum dot co-sensitized solar cells

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ZnO/TiO₂ nanocable structured photoelectrodes for CdS/CdSe quantum dot co-sensitized solar cells

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Lili Qu, Xuanhui Cao, Guozhong Zhang, Qifeng Gao, Rui Shen, Laifa Tian, Jianjun Zhang, Shengen
Copyright Year	2013
Abstract	Photoelectrode made of nanocable structure of ZnO nanorods (NR) coated with TiO2 nanosheets (NSs) was investigated for CdS/CdSe quantum dot co-sensitized solar cells. ZnO NRs prepared solution reaction at 60 °C served as the backbone for direct electron transport in view of the single crystallinity of the ZnO NRs and the high electron mobility of ZnO semiconductor. Anatase TiO2 NSs with the thickness of ∼10 nm and the length of ∼100 nm were assembled onto the surface of ZnO NRs via a solvothermal method. It was found that the thin shell of TiO2 might have remarkable influence on the quantum dot sensitized solar cells (QDSCs) through (a) increasing the surface area of ZnO NRs to allow for adsorbing more quantum dots (QDs), which led to high short current density, (b) forming an energy barrier that hindered the electrons in the ZnO from being back to the electrolyte and QDs, and thus, reduced the charge recombination rate, resulting in prolonged electron lifetime and enhanced open voltage. In comparison with the case of ZnO NRs, the short-circuit current density, open-circuit voltage, fill factor and charge recombination resistance of ZnO/TiO2 nanocable photoelectrode increase by 3%, 44%, 48% and 220%, respectively. As a result, a power conversion efficiency of 2.7% of QDSCs with core–shell structural nanocable photoelectrode has been obtained, which is as much as 230% of that of 1.2% obtained for ZnO NR photoelectrode.
Starting Page	936
Ending Page	943
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	5
Issue Number	3
Journal	Nanoscale
DOI	10.1039/c2nr32663a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Quantum dot Semiconductor Anatase Electrolyte Carrier generation and recombination Electron mobility Photoelectrode Quantum tunnelling
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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