Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 18, Pages 6517-6523Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.04.118
Keywords
Zn-doped TiO2; Surface photovoltage; Dye-sensitized solar cells
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Funding
- National Basic Research Program of China (973 Program) [2007CB613303]
- National Natural Science Foundation of China [20703020, 20873053]
- Science and Technology Developing Funding of Jilin Province [201115012]
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Zn-doped TiO2 microspheres have been synthesized by introducing a trace amount of zinc nitrate hexahydrate to the reaction system. Scanning electron microscope (SEM), field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) have been utilized to characterize the samples. Both surface photovoltage spectroscopy (SPS) technique based on lock-in amplifier and transient photovoltage (TPV) measurement reveal that the slight doping of Zn can promote the separation of photo-generated charges as well as restrain the recombination due to the strong interface built-in electric field and the decreasing of surface trap states. The photovoltaic parameters of dye-sensitized solar cells (DSSCs) based on Zn-doped TiO2 are significantly better, compared to that of a cell based on undoped TiO2. The relation between the performance of DSSCs and their photovoltaic properties is also discussed. (C) 2011 Elsevier Ltd. All rights reserved.
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