Abstract
A layer-by-layer titanium (IV) chloride treatment was applied on different layers of TiO2 in dye-sensitized solar cells (DSSCs). The effects were analysed and compared with standard untreated devices. A significant increase in short-circuit current density (JSC) was observed by employing layer-by-layer TiCl4 treatment of TiO2 in DSSCs. This increase of JSC is attributed to the increased inter-particle connectivity and increase in TiO2 nanoparticle size, resulting in better electron transfer and a lower charge carrier recombination rate. The DSSC fabricated with layer-by-layer-treated TiO2 achieved power conversion efficiency of 8.3%, which is significantly higher than the 6.7% achieved for the DSSC fabricated without TiCl4 treatment. Electrochemical impedance spectroscopy (EIS) was performed to assess the better performance of the device fabricated with TiCl4 treatment. Atomic force microscopy and surface roughness were studied to visualize and statistically determine the function of TiCl4 treatment on different layers of TiO2. Transient photocurrent and transient photovoltage measurements were also performed to gain insight into interfacial charge carrier recombination.
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We acknowledge the financial support extended by Dongguan University of Technology, China. This project was also supported by HEC Pakistan and US National Academy of Sciences, under the PAK-US Science and Technology Cooperation Program, Phase-V, project number 5-530/PAK-US/HEC/2013/193.
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Shah, S.A.A., Guo, Z., Sayyad, M.H. et al. Layer-by-Layer Titanium (IV) Chloride Treatment of TiO2 Films to Improve Solar Energy Harvesting in Dye-Sensitized Solar Cells. J. Electron. Mater. 50, 613–619 (2021). https://doi.org/10.1007/s11664-020-08598-6
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DOI: https://doi.org/10.1007/s11664-020-08598-6