Charge recombination reduction in dye-sensitized solar cells by depositing ultrapure TiO2 nanoparticles on “inert” BaTiO3 films |
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| Authors: | Min Zhong Jingying ShiWenhua Zhang Hongxian HanCan Li |
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| Affiliation: | a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, PR China
b Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | Ultrapure TiO2 nanoparticles (∼5 nm in size) were supported on “inert” BaTiO3 films by TiCl4 treatment, which was used to fabricate dye-sensitized solar cells (DSSCs). The optimized electrode, designated as BaTiO3/TiO2(4), was obtained upon four cycles of TiCl4 treatment. DSSC with BaTiO3/TiO2(4) electrode exhibits superior power conversion efficiency (PCE) compared to that with conventional anatase TiO2 (∼25 nm in size) electrode. The interfacial charge recombination kinetics was investigated by electrochemical impedance spectroscopy (EIS) and intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS). In contrast to DSSC with anatase TiO2 electrode, the dramatically enhanced electron lifetime for DSSC with BaTiO3/TiO2(4) electrode could be attributed to the decrease of recombination reaction at the TiO2 photoelectrode/electrolyte interface. It is proposed that the lower interfacial charge recombination can be related to the relatively shallower trap distributions in DSSC with BaTiO3/TiO2(4) electrode. |
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| Keywords: | Interfacial charge recombination Trap states BaTiO3 Anatase TiO2 Dye-sensitized solar cells |
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