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      https://www.ias.ac.in/article/fulltext/boms/044/0068

    • Keywords

       

      Dye-sensitized solar cells; co-sensitization; light scattering; electrospun nanofibres; triple layered photoanode.

    • Abstract

       

      A method for impressive efficiency enhancement in TiO$_2$-based nanoparticle (NP) dye-sensitized solar cells (DSSCs) is demonstrated by using a co-sensitized triple layered photoanode, comprising a nanofibre (NF) layer of TiO$_2$ sandwiched between two TiO$_2$ P25 NP layers. Rose Bengal (RB) and Eosin-Y (EY) dyes are used for the co-sensitization. DSSCs with conventional TiO$_2$ (P25) NP bi-layer photoanode (NP/NP), sensitized with EY, showed an overall power conversion efficiency (${\eta}$) of 0.89% under the illumination of 100 mW cm$^{–2}$ (AM 1.5) with iodide-based liquid electrolyte. Whereas DSSCs fabricated with triple layered photoanode (NP/NF/NP) with the same total thickness and sensitized with EY yielded 1.77% efficiency under the same illumination conditions, showing an impressive ${\sim}$99% enhancement in the overall power conversion efficiency. The DSSCs fabricated with RB-sensitized NP/NP and NP/NF/NP photoanodes showed 0.25 and 0.73% efficiencies, respectively. Upon optimization, DSSCs fabricated with co-sensitized NP/NP bilayer and NP/NF/NP triple layer photoanodes showed 1.04 and 2.09% efficiencies, respectively, showing again an impressive ${\sim}$100% enhancement in ${\eta}$ due to the co-sensitized triple layer photoanode structure. Increase in the short circuit photocurrent density, UV–visible absorptions measurements, incident photon to current efficiency and electrochemical impedance spectroscopic measurements confirmed that this enhancement is very likely due to the enhanced light harvesting and reduction of recombination of photoelectrons combined with the enhanced spectral responses of the cosensitized triple layered photoanode.

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    • Author Affiliations

       

      G K R SENADEERA1 2 D BALASUNDARAM1 2 M A K L DISSANAYAKE1 B A KARUNARATNE3 A M J S WEERASINGHE1 C A THOTAWATTHAGE1 T JASEETHARAN4 J M K W KUMARI1 D L N JAYATHILAKA2

      1. National Institute of Fundamental Studies, Kandy 20000, Sri Lanka
      2. Department of Physics, The Open University of Sri Lanka, Nawala, Nugegoda 10250, Sri Lanka
      3. Department of Material Technology, Faculty of Technology, Rajarata University of Sri Lanka, Mihintale 50300, Sri Lanka
      4. Department of Physical Sciences, Faculty of Applied Sciences, South Eastern University of Sri Lanka, Sammanthurai 32200, Sri Lanka
    • Dates

       
  • Bulletin of Materials Science | News

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