• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/044/0205

    • Keywords

       

      CdS capping; quantum dots (QDs); citric acid; sensitization; solar cells.

    • Abstract

       

      Influence of citric acid on the photovoltaic properties of the CdS quantum dot-sensitized TiO$_2$ solar cells (QDSSCs) was studied. Tethering of citric acid molecules with both TiO$_2$ and CdS quantum dots (QDs) was confirmed by Fourier transform infrared spectroscopy technique. High-resolution transmission electron microscopic studies revealed that QDs with average size of ${\sim}$4.5 nm, were tethered with TiO$_2$ nanoparticles of diameter ${\sim}$40 nm. Presence of Cd, S,C, Ti and O elements in the composite photoanode and their uniform distribution throughout the photoanode were confirmed by energy dispersive X-ray spectroscopy measurements. QDSSCs fabricated with pristine TiO$_2$ photoanode exhibited a short circuit current density ($J_{SC}$) of 5.80 mA cm$^{-2}$ and an overall power conversion efficiency (${\eta}$) of 1.10%, whereas solar cells made with citric acid-treated, photoanode-exhibited a $J_{SC}$ of 8.20 mA cm$^{-2}$ with 1.50% efficiency under 100 mW cm$^{-2}$ (AM 1.5) light illumination. This is an impressive 60% increase in the $J_{SC}$ and ${\sim}$36% enhancement in the overall power conversion efficiency. Interfacial resistance of QDSSCs is estimated by using electrochemical impedance spectroscopy revealed that citric acid treatment enhanced both the electron injection to the conduction band of the TiO$_2$ from the CdS as well as the overall charge transfer of the device, while decreasing the recombination of the photo-generated electrons with their holes in the electrolyte.

    • Author Affiliations

       

      G K R SENADEERA1 2 W I SANDAMALI1 2 M A K L DISSANAYAKE2 T JASEETHARAN2 3 V P S PERERA1 C N RAJENDRA1 N KARTHIKEYAN1 LAHIRU A WIJENAYAKA4

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

       
  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.