Browsing by Author "S, Sowmya"

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    DYE-SENSITIZED SOLAR CELL USING EOSIN Y DYE IN VARIOUS CONCENTRATIONS
    (Science Direct, 2021-01) N, Ruba; Pooja, Prakash; S, Sowmya; B, Janarthanan; A, Nagamani Prabu; J, Chandrasekaran
    This work investigated the effect of various concentrations of Eosin Y dye on the performance of the Dye-sensitized solar cell (DSSC). Distinct concentrations like 10 mg, 20 mg and 30 mg of Eosin Y Dye were prepared for the construction of DSSC. For preparation of photoanode, Titanium dioxide nanoparticles were used to prepare paste, which was deposited on fluorine doped tin oxide (FTO) glass substrate by Doctor blade technique. Absorption spectra of the dyes were taken, and the photovoltaic performance was measured for the fabricated cells. The highest efficiency is obtained by the cell with 10 mg of Eosin Y which is 0.39%. The conversion efficiency of the cells with 20 mg and 30 mg of Eosin Y are 0.007% and 0.0015% respectively.
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    DYE-SENSITIZED SOLAR CELLS USING A COCKTAIL OF SYNTHETIC (EOSIN Y) AND NATURAL (BEETROOT, POMEGRANATE, AND KUMKUM) DYES
    (SpringerLink, 2021-08-06) N, Ruba; S, Sowmya; Pooja, Prakash; B, Janarthanan; A, Nagamani Prabu
    For the purpose of the study, dye extracts were prepared from natural sources like beetroot, pomegranate, kumkum, and separately mixed with Eosin Y dye. TiO2 nanoparticles were coated over the fluorine-doped tinoxide (FTO) by doctor blade technique, and a counter cathode was prepared by coating the graphene over FTO film. A sandwich-type solar cell was made and the photovoltaic performance measured using Keithley Electrometer 6517B with a Xenon lamp of 100 mW/cm2 as solar simulator. Among the cocktail of dyes, solar cells with beetroot and Eosin Y dye exhibited the highest efficiency of 0.3%. The conversion efficiency of solar cell with pomegranate and Eosin Y was 0.1%, while that of the cells with kumkum and Eosin Y was 0.2%.
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    FABRICATION OF NATURAL DYE-SENSITIZED SOLAR CELLS WITH BULK TIO2 INSTEAD OF NANO-SIZED
    (Elsevier, 2021-09) S, Sowmya; Pooja, Prakash; N, Ruba; A, Nagamani Prabu; B, Janarthanan; Vasudeva, Reddy Minnam Reddy; H.H., Hegazy
    Dye- sensitized solar cells (DSSCs) are typically made-up with nano-sized TiO2 but in this study an attempt was made to fabricate cells with TiO2 that are not of nano-size. Amaranthus and Henna leaves were chosen as dye-sensitizers. UV–vis and FTIR spectroscopic studies were taken to know the absorption range and functional groups of the dyes. J–V Characteristic study taken showed diode characteristics instead of solar cell characteristics.
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    A NOVEL APPROACH TO DYE-SENSITIZED SOLAR CELLS USING NATURAL COCKTAIL PHOTOSENSITIZERS WITH NANO TIO2 SEMICONDUCTOR
    (SpringerLink, 2022-10-22) Pooja, Prakash; N, Ruba; S, Sowmya; B, Janarthanan
    The domain of dye-sensitized solar cells, which use natural dye as a sensitizer, is still being studied. This work aims to determine the most potent sensitizers, namely Geneus Tectona grandis, Chassalia curviflora, and Lawsonia inermis for DSSC fabrication. These dyes were co-sensitized in equal proportions, and the performance of DSSCs was improved through co-sensitization of the natural dyes. The effect of sensitizers and their novel cocktail combination in various solvents namely ethanol and deionized water on DSSC performance is examined. Optical properties and the presence of anchoring groups (carboxyl and hydroxyl groups) in the dye extracts are revealed using UV–Vis and FTIR spectroscopy. Successful accomplishment in the conversion of sunlight into electricity and nano TiO2-based solar cells using Geneus Tectona grandis, Chassalia curviflora, Lawsonia inermis, and a cocktail of extracts in which Tectona grandis in ethanol displayed the highest photoconversion efficiency of 0.7% compared to co-sensitized dye extracts, whose power conversion efficiency is 0.2%, respectively. The presence of anthocyanin derivative in teak extracts is very sensitive to visible light and thus leads to higher photosensitized performance. Sensitizers for DSSCs must meet crucial parameters such as strong chelation to the semiconductor oxide surface and absorption in the visible and near-infrared portions of the solar spectrum
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    A NOVEL IDEA OF USING DYES EXTRACTED FROM THE LEAVES OF PROSOPIS JULIFLORA IN DYE – SENSITIZED SOLAR CELLS
    (Elsevier, 2021-10) S, Sowmya; K, Inbarajan; N, Ruba; Pooja, Prakash; B, Janarthanan
    As a step of environmental protection by waste management, fresh and dried leaves of Prosopis juliflora were utilised in preparing natural dyes with ethanol and acetone as solvents and were made use as sensitizers in Dye-Sensitized Solar Cells (DSSC). Four dyes were taken in total, UV–Vis and FTIR spectroscopic studies were performed for the prepared dye sensitizers. J-V Characterization study was carried out for the fabricated cells and important parameters like Short-circuit current (Jsc), open-circuit voltage (Voc), fill-factor (FF) and photo-conversion efficiency were determined. It was seen that the cell with dye extracted from dried leaves using acetone as solvent showed the highest photo-conversion efficiency of 0.322 % among the four cells fabricated. While the cells prepared with the fresh leaves showed an efficiency of 0.017 % and 0.225 % with ethanol and acetone respectively and the cell with the dye taken from the dried leaves using ethanol solvent exhibited an efficiency of 0.058 %.
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    PLASMONIC STRUCTURES GENERATED BY RADIALLY POLARIZED SINH GAUSSIAN BEAM
    (PSGR Krishnammal College for Women, 2015-12-07) S, Sowmya
    The numerical investigation on plasmonic structures generated by excitation of surface plasmon using radially polarized Sinh gaussian beam based on vector diffraction theory is studied. It is observed that by suitably altering the beam waist ratio and beam order corresponding to various topological charges can generate a plasmonic structures with confined spot and larger focal depth. The side lobe intensity is found to vary drastically with increase in beam order and beam waist ratio for every topological charges considered. Thus by properly increasing the beam ratio value and beam order generates a highly confined focal spot with larger focal depth. Due to its higher resolution this beam finds application in optical trapping, high resolution imaging and optical data storage.
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    A STUDY ON THE FABRICATION AND CHARACTERIZATION OF DYE-SENSITIZED SOLAR CELLS WITH AMARANTHUS RED AND LAWSONIA INERMIS AS SENSITIZERS WITH MAXIMUM ABSORPTION OF VISIBLE LIGHT
    (SpringerLink, 2020-03-09) S, Sowmya; Pooja, Prakash; N, Ruba; B, Janarthanan; A, Nagamani Prabu; J, Chandrasekaran
    Dye-sensitized solar cells (DSSC) were fabricated with dyes extracted from the leaves of Amaranthus red and Lawsonia inermis (Henna). A total of ten dyes were synthesized using solvents like distilled water, acetone and ethanol. UV–Vis spectroscopy was taken for all the dyes prepared. FTIR was taken for the dyes which had maximum absorption in the visible region. FTO substrates coated with nanosized TiO2 sensitized with dyes extracted were the photoanodes. Counter cathode was primed using graphene-coated FTO films. Two solar cells have been made up with the efficient dyes prepared from Amaranthus and Henna. J–V characterization performed for the cells showed that the solar cell fabricated with Amaranthus dye was efficient with the photoconversion efficiency and fill factor of 0.14% and 0.3864, respectively, compared to the cells fabricated using Henna dye whose photoconversion efficiency and fill factor are 0.09% and 0.3851, respectively.