Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

K V Murali; T L Remadevi

doi:10.17485/IJST/v14i25.818

Article

Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

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Indian Journal of Science and Technology

DOI: 10.17485/IJST/v14i25.818

Year: 2021, Volume: 14, Issue: 25, Pages: 2097-2105

Original Article

Photo-characterization of Organic Dye-Sensitized Tin Oxide Films

K V Murali^1,*, T L Remadevi²

1 Department of Physics, Nehru Arts and Science College, Kanhangad, Kerala, 671314, India

2 Department of Physics, Pazhassi Raja N.S.S. College, Mattannur, Kerala, 670702, India

Corresponding author email: [email protected]

Received Date:24 May 2021, Accepted Date:05 July 2021, Published Date:19 July 2021

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

Objectives: To develop organic dye sensitized film electrodes from highly porous tin oxide (SnO₂) thin films prepared at room temperature using the SILAR technique. Methods/Analysis: SnO₂ films were fabricated by the successive ionic layer adsorption and reaction (SILAR) technique at room temperature and its sensitization was done using the organic dye Rose Bengal (RB). The effect of sensitization on the as-grown and annealed film electrodes was investigated. Findings : Crystalline films with cauliflower-like morphology exhibit a large inherent adsorptive surface area and exhibit steady transmittance of 60-80% in the visible region. As-grown SnO₂ films possess higher porosity and lower refractive index than that of the annealed films. SnO₂ films have a resistivity in the range of 10^-2-10^-3 ΩcmΩcm. The dye adsorbed SnO₂film electrodes have much higher absorbance and cover a broad visible region compared to the bare SnO₂ film electrodes. RB sensitization leads to an accelerated improvement in absorbed photon energy through the visible region of the spectrum extending from 2 to 3.75 eV. Novelty: Contrary to the sophisticated methods of preparation in the reported literature, highly porous crystalline SnO₂ thin films were prepared at room temperature, using glacial acetic acid and hydrogen peroxide by a cost-effective simple wet chemical method. Work demonstrates that SnO₂ films sensitized with RB act as an excellent dye-sensitized electrode, which can absorb almost half the visible spectrum (400-600 nm) of solar radiations. We believe that this is the unique report of surface modification of wet chemically prepared SnO₂ electrodes by the photo-sensitizer RB.

Keywords

Photocharacterization, rose bengal, sensitization, thin films, tin oxide electrodes

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© 2021 Murali & Remadevi. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Published By Indian Society for Education and Environment (iSee)