Faculty Publications

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Author: search.filters.author.Mahesha, M.G.

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    Study of photo-conductivity in nano-crystalline cadmium telluride thin films
    (2011) Mahesha, M.G.; Bangera, K.V.; Shivakumar, G.K.
    Nano crystallite thin films of Cadmium Telluride have been grown on glass substrates by thermal evaporation under vacuum. The growth conditions to get stoichiometric films of the compound have been optimized. The effect of substrate temperature and annealing on photosensitivity has been investigated. Also the effect of deposition parameters and post deposition annealing on rise time and decay time have been studied in detail. © 2011 American Institute of Physics.
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    Structure and properties of vacuum deposited cadmium telluride thin films
    (2006) Shreekanthan, K.N.; Bangera, K.V.; Shivakumar, G.K.; Mahesha, M.G.
    Systematic and detailed study of the growth and properties of vacuum deposited cadmium telluride thin films was made. Both p- and n-type films were grown and these films were characterized for their structural, optical, and electrical properties. The crystallographic structure of the deposits was found to be dependent on the rate of deposition. Low deposition rates were observed to result in hexagonal deposits whereas high rates of deposition favoured cubic structure for the film. Electrical and optical properties were also found to be dependent on the deposition parameters.
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    Characterization of thin film Al/p-CdTe schottky diode
    (2008) Mahesha, M.G.; Kasturi, V.B.; Shivakumar, G.K.
    A study has been made on the behavior of Al/p-CdTe thin film junction grown by thermal evaporation method. I-V characteristics show that the Al makes Schottky contact with p-CdTe. The variation of junction capacitance with frequency and voltage has been studied to evaluate the barrier height. The activation energy and band gap have been estimated by studying variation of resistivity with temperature. Using all these data, band diagram of Al/p-CdTe has been proposed. © TÜB?TAK.
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    Characterization of p-CdTe/n-CdS hetero-junctions
    (2009) Mahesha, M.G.; Bangera, K.V.; Shivakumar, G.K.
    Nano-crystalline CdTe/CdS thin film hetero-junctions have been grown on glass substrate by thermal evaporation technique. The growth conditions to get stoichiometric compound films have been optimized. The grown hetero-junctions have been characterized for their I-V characteristics. Analysis of I-V characteristics has been made to investigate the current conduction mechanism in p-CdTe/n-CdS hetero-junction. The band gap energy of cadmium telluride and cadmium sulfide films have been computed from the study of variation of resistance with temperature. Based on the study, band diagram for p-CdTe/n-CdS hetero-junction has been proposed.
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    Modified matrix of ZnO prismoid structures for improved photocatalytic activity: A theoretical and experimental insight
    (Elsevier B.V., 2024) Manohar, A.; Kompa, A.; Christopher, B.; Shil, S.; Rao, K.; Udayshankar, N.K.; Mahesha, M.G.; Singh, V.; U, U.
    Currently, the world needs low-cost and high-performance photocatalysts to degrade the carcinogenic pollutant from water. In the present work, a modified ZnO matrix using Mg as a dopant has been reported with theoretical and experimental results to highlight its structure and functions on photocatalytic activity. A versatile chemical co-precipitation technique was employed to get the Mg-ZnO nanostructures. Structural characterization by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) studies show the formation of hexagonal wurtzite structures with no impurity phases. Optical studies confirm the formation of ZnO with intrinsic defects after modifying the matrix, which agrees with the band structure calculations computed using density functional theory (DFT). Mg-modified ZnO introduced intrinsic defects like vacancies and interstitials that have a great impact on applications like photocatalysis. Based on these supporting results we employed prepared samples for dye degradation, which performed well (80% degradation efficiency) in a short period of UV irradiation. This could be a promising technology for environmental remediation. © 2023 Elsevier B.V.