Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 741, Issue -, Pages 1142-1147Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.01.220
Keywords
TiO2; Iodine-doped; Quasi-solid-state; Dye-sensitized solar cell; Electron transport; Electron life time
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Funding
- Natural Science Foundation of Hubei Province [2018CFB740]
- Research and Development Project of Xianning Municipal Science and Technology Bureau [Xnkj-05]
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We report on the synthesis of Iodine-doped hierarchical TiO2 spheres by a general hydrothermal method, and their application as photoanodes of quasi-solid-state dye-sensitized solar cells (DSSCs). The Iodine-doped TiO2 spheres were characterized by SEM, XRD, and XPS. The performance of I-doped TiO2 spheres based DSSCs was obviously enhanced, an optimized energy conversion efficiency of 6.38% was obtained, which increased by 34% compared with the cell based on undoped TiO2 (4.76%). The Iodine-doped and undoped TiO2 spheres based solar cell were analyzed by electrochemical impedance spectroscopy (EIS), intensity modulated photocurrent spectroscopy (IMPS), intensity modulated photovoltage spectroscopy (IMVS) and incident photon-to-current efficiency (IPCE) measurements. The results revealed that the enhanced performance could be explained by the expanded visible-light response, the reduced electron recombination, the improved electron transport and the prolonged electron life time in the TiO2 film by iodine doping. (C) 2018 Elsevier B.V. All rights reserved.
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