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Extensive enhancement in power conversion efficiency of dye-sensitized solar cell by using Mo-doped TiO2 photoanode

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Abstract

In this work, we have synthesized Mo-doped TiO2 nanoparticles by sol–gel method and used them as photoanode in dye-sensitized solar cells (DSSCs). Mo doping resulted in reduced TiO2 crystallite size as revealed from XRD and TEM studies, which caused enhancement in surface area and greater dye loading and hence improved current conversion efficiency of DSSC. The short-circuit current density (JSC) and efficiency (η) of the cell employing Mo-doped TiO2 photoanode have been extensively enhanced compared to the cell using un-doped TiO2. The optical bandgap (Eg) for 0.25 wt% Mo-doped TiO2 and un-doped TiO2 was obtained as 2.35 eV and 3.04 eV, respectively. The values of JSC and η for the cell employing 0.25 wt% Mo-doped TiO2 photo-anode were 8.54 mA/cm2 and 3.78%, respectively, under illumination of 100 mW/cm2 light intensity (with corresponding values for un-doped TiO2 4.01 mA/cm2 and 0.73% respectively under similar illumination condition). Electrochemical impedance spectroscopy (EIS) and Mott–Schottky analyses revealed resistivity, capacitive elements, the donor density, and flat band potential respectively for un-doped and Mo-doped TiO2. The work demonstrated that Mo-doped TiO2 can be used as a photo-anode material for developing low-cost, high-efficiency DSSC.

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Authors and Affiliations

  1. Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India

    Ashish Jayasawal, Shubham Sharma, Shalini Singh & Pankaj Srivastava

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  1. Ashish Jayasawal
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  2. Shubham Sharma
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  3. Shalini Singh
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  4. Pankaj Srivastava
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Correspondence to Pankaj Srivastava.

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Jayasawal, A., Sharma, S., Singh, S. et al. Extensive enhancement in power conversion efficiency of dye-sensitized solar cell by using Mo-doped TiO2 photoanode. J Solid State Electrochem 26, 2209–2217 (2022). https://doi.org/10.1007/s10008-022-05238-3

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