Journal
NANO ENERGY
Volume 8, Issue -, Pages 1-8Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2014.05.003
Keywords
Anatase TiO2 nanowire arrays; Electrodeposition; CdS; CdSe; Quantum dot-sensitized solar cells
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Funding
- National Natural Science Foundation of China [91222201]
- Program for New Century Excellent Talents in University [NCET-11-0533]
- Fundamental Research Funds for the Central Universities
- Huizhou Program of Science and Technology [2012C050012007]
- NSF of Guangdong Province [S2013030013474]
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The vertically aligned anatase TiO2 nanowire arrays with smooth or branched architectures were grown on TCO substrate directly via a simple surfactant-free hydrothermal route. And they were utilized to fabricate efficient quantum-dot sensitized solar cells (QDSSCs) for the first time. The thickness of CdS and CdSe shell were confirmed by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and energy dispersive X-Ray spectroscopy (EDX). A power conversion efficiency of 4.2% was attained with the hierarchical TiO2 nanowires based cell, which is 30% higher than that of smooth nanowires devices due to improved short-circuit current density (J(SC)) and fill factor (FF). The increased Jsc profits from superior light-scattering ability of branched hierarchical TiO2 nanowires for enhanced light-harvesting efficiency and the prominent charge-collection efficiency benefited from additional growth of branches for efficient and effective electron injection. (C) 2014 Elsevier Ltd. All rights reserved.
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