Physics - Research Publications

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    Highly stable and sensitive photon detection performance of ZnO thin film for ultraviolet light
    (Elsevier B.V., 2022-04-14T00:00:00) Kaawash, Nabeel M.S.; Kejriwal, Nubbh; Halge, Devidas I.; Narwade, Vijaykiran N.; Rana, Abhimanyu S.; Dadge, Jagdish W.; Jejurikar, Suhas M.; Alegaonkar, Prashant S.; Bogle, Kashinath A.
    The photo detection characteristics of spray pyrolysis deposited ZnO thin film on glass substrate at 250 OC was demonstrated for fabrication of highly stable visible-blind UV photodetector. This photodetector exhibits lower dark current < 0.04 ?A, higher UV photosensitivity ?4750, responsivity of 0.14 A/W and detectivity of 1.24 � 1012 Jones at an average intensity of 140 ?W/cm2 of 340 nm. This Ag/ZnO/Ag device show excellent photo response (rise and decay) time of ?4 and 6 ms with external quantum efficiency of 51%. The observed photocurrent in the device is associated with adsorption and light-induced desorption of oxygen from the defect sites on the film surfaces. The adsorbed oxygen removes the electron trap centers and increasing the free carrier density in ZnO. � 2022 Elsevier B.V.
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    Natural Basil as Photosensitizer with ZnO Thin Films for Solar Cell Applications
    (Taylor and Francis Ltd., 2020-06-04T00:00:00) Shiyani, Tulshi; Mahapatra, S.K.; Banerjee, Indrani
    The hybrid solar cell has been fabricated using natural dye extracted from basil or ocimum leaves and ZnO thin film. The extracted natural dye was deposited on ZnO thin films and dried at room temperature. The semiconductor layer of ZnO was fabricated on FTO-coated glass substrate using magnetron sputtering with a thickness of 500 nm. A photocathode was prepared from the Au�Pd mixture using sputtering for a top electrode. ZnO has been confirmed using X-ray diffraction and UV�visible absorption spectroscopy measurements. The photovoltaic characteristics of the prepared DSSCs were studied by measuring the I�V characteristics under the illumination of halogen light. Photocurrent and photovoltage both are increased in the cell. The value of short-circuit current (I sc), open-circuit voltage (V oc), and photon energy conversion efficiency (?) were calculated for a dye-sensitized solar cell (DSSC). DSSCs provide the promising light to electrical energy conversion efficiency due to their low-cost fabrication, environmentally friendly elements, and low maintenance. DSSC offers transparent solar cell modules with the capabilities of the use of hybrid composition such as organic and inorganic materials. The basil/ZnO-based hybrid devices can also be useful for photoelectrochemical cell and water splitting applications. � 2022 IETE.
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    Natural Basil as Photosensitizer with ZnO Thin Films for Solar Cell Applications
    (Taylor and Francis Ltd, 2020) Shiyani, T; Mahapatra, S.K; Banerjee, I.
    The hybrid solar cell has been fabricated using natural dye extracted from basil or ocimum leaves and ZnO thin film. The extracted natural dye was deposited on ZnO thin films and dried at room temperature. The semiconductor layer of ZnO was fabricated on FTO-coated glass substrate using magnetron sputtering with a thickness of 500 nm. A photocathode was prepared from the Au�Pd mixture using sputtering for a top electrode. ZnO has been confirmed using X-ray diffraction and UV�visible absorption spectroscopy measurements. The photovoltaic characteristics of the prepared DSSCs were studied by measuring the I�V characteristics under the illumination of halogen light. Photocurrent and photovoltage both are increased in the cell. The value of short-circuit current (Isc), open-circuit voltage (Voc), and photon energy conversion efficiency (?) were calculated for a dye-sensitized solar cell (DSSC). DSSCs provide the promising light to electrical energy conversion efficiency due to their low-cost fabrication, environmentally friendly elements, and low maintenance. DSSC offers transparent solar cell modules with the capabilities of the use of hybrid composition such as organic and inorganic materials. The basil/ZnO-based hybrid devices can also be useful for photoelectrochemical cell and water splitting applications. � 2020, � 2020 IETE.