Journal
RSC ADVANCES
Volume 6, Issue 81, Pages 78202-78209Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra15481f
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Funding
- National Natural Science Foundation of China [51472274, 21103236]
- Pearl River S&T Nova Program of Guangzhou [2014J2200025]
- Program of Guangzhou Science and Technology [2014J4100016, 201504010031]
- Research Fund for the Doctoral Program of Higher Education [20110171120026]
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In this manuscript, a novel hierarchical ZnO nanosheets branched electrospun TiO2 non-woven fabric film is prepared and used as a photoanode for quantum dot-sensitized solar cells (QDSSCs). Porous ZnO nanosheets grown on a TiO2 nanofiber are synthesized via simple hydrothermal reaction followed by a calcination process, which is proven to provide both large surface areas for QDs loading and superior light-scattering capability. Detailed photoelectrochemical measurements, including UV-vis diffuse reflectance and absorption spectra, electrochemical impedance spectra (EIS), intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS), etc., reveal that, compared with a bare TiO2 nanofiber film, the hierarchical fibrous film exhibits enhanced light-harvesting efficiency, suppressed electron recombination and superior charge-collection efficiency, thus leading to both improved short-circuit current density (J(sc)) and open-circuit voltage (V-oc). Therefore, the conversion efficiency of the solar cell is greatly improved from 2.37% for a bare TiO2 nanofiber film to 3.05%. A Cu2S counter electrode can help to yield a conversion efficiency as high as 4.21%.
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