Journal
MATERIALS RESEARCH BULLETIN
Volume 70, Issue -, Pages 928-934Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2015.06.037
Keywords
Solvothermal method; Hierarchical TiO2 submicron-sized spheres; Light scattering; Dye-sensitized solar cells
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Funding
- National Nature Science Foundation of China [11172301, 21203217]
- Funds for Distinguished Young Scientists of Hubei Province [2012FFA002]
- Western Light Talent Culture Project
- Chinese Academy of Sciences
- Top Hundred Talents Program of Chinese Academy of Sciences
- National 973 Project [2013CB632300]
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Hierarchical TiO2 submicron-sized spheres (TiO2 HSSs) with diameters of 400-600 nm were synthesized by a facile one-step solvothermal method in ethanol solvent. The HSSs composed of nanoparticles of 14 nm have a relatively large surface area of 35 m(2)/g. When applied as the scattering overlayer in dye-sensitized solar cells (DSCs), such TiO2 HSSs effectively improved light harvesting and led to the increase of photocurrent in DSCs. Furthermore, bilayer-structured photoanode also provided fast electron transportation and long electron lifetime as confirmed by electrochemical impedance spectra. As a result, DSC based on P25 nanoparticle underlayer and HSS-2 overlayer exhibited the highest cell efficiency (6.23%) compared with ones with pure P25 (5.50%) or HSS-2 (2.00%) photoanodes. (C) 2015 Elsevier Ltd. All rights reserved.
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