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Improved Performance of Dye-Sensitized Solar Cells Fabricated from a Coumarin NKX-2700 Dye-Sensitized TiO2/MgO Core–Shell Photoanode with an HfO2 Blocking Layer and a Quasi-Solid-State Electrolyte

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Abstract

Dye sensitized solar cells (DSSC) were fabricated from a coumarin NKX-2700 dye-sensitized core–shell photoanode and a quasi-solid-state electrolyte, sandwiched together, with a cobalt sulfide-coated counter electrode. The core–shell photoanode consisted of a composite mixture of 90% TiO2 nanoparticles and 10% TiO2 nanowires (TNPW) as core layer and MgO nanoparticles (MNP) as shell layer. Hafnium oxide (HfO2) was applied to the core–shell photoanode film as a blocking layer. TiO2 nanoparticles, TiO2 nanowires, and TNPW/MNP were characterized by x-ray diffractometry, scanning electron microscopy, and transmission electron microscopy. It was apparent from the UV–visible spectrum of the sensitizing dye coumarin NKX-2700 that its absorption was maximum at 525 nm. Power conversion efficiency (PCE) was greater for DSSC-1, fabricated with a core–shell TNPW/MNP/HfO2 photoanode, than for the other DSSC; its photovoltaic properties were: short circuit photocurrent J sc = 19 mA/cm2, open circuit voltage (V oc) = 720 mV, fill factor (FF) = 66%, and PCE (η) = 9.02%. The charge-transport and charge-recombination behavior of the DSSC were investigated by electrochemical impedance spectroscopy; the results showed that the composite core–shell film resulted in the lowest charge-transfer resistance (R CE) and the longest electron lifetime (τ eff). Hence, the improved performance of DSSC-1 could be ascribed to the core–shell photoanode with blocking layer, which increased electron transport and suppressed recombination of charge carriers at the photoanode/dye/electrolyte interface.

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Acknowledgement

We thank Bharathiar University, Coimbatore and Annamalai University, Chidambaram, for allowing us to perform this work in their laboratory.

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Authors and Affiliations

  1. Department of Physics, Muthayammal College of Engineering, Rasipuram, Tamil Nadu, India

    D. Maheswari

  2. Department of Physics (DDE), Annamalai University, Annamalainagar, Tamil Nadu, India

    P. Venkatachalam

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  1. D. Maheswari
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  2. P. Venkatachalam
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Correspondence to P. Venkatachalam.

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Maheswari, D., Venkatachalam, P. Improved Performance of Dye-Sensitized Solar Cells Fabricated from a Coumarin NKX-2700 Dye-Sensitized TiO2/MgO Core–Shell Photoanode with an HfO2 Blocking Layer and a Quasi-Solid-State Electrolyte. J. Electron. Mater. 44, 967–976 (2015). https://doi.org/10.1007/s11664-014-3595-2

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