Department of Physics

Permanent URI for this communityhttps://ir.nbu.ac.in/handle/123456789/4173

Physics is one of those departments with which North Bengal University started its journey in the year 1962. At present there are nine faculty members and ten non-teaching employees in the department. The department has active research groups in the field of (a) Liquid Crystal, (b) Relativity, Cosmology, and Astrophysics, (c) High-energy Heavy-ion Interaction and Cosmic-ray Physics, and (d) Solid-state devices. Several research projects sponsored by the DST, DAE, UGC, and Tea Research Board are running in the department. In the year 2003 the department received a financial support under the FIST programme from the DST, Govt. of India. The department offers both M.Sc. and Ph.D. courses. A semester system is followed in the M.Sc. level, with three different areas of specialization namely, Condensed Matter Physics, Electronics and Nuclear and Particle Physics, out of which a student can choose one. The annual intake capacity in M.Sc. is 40 students. In the Ph.D. programme of the department right now 25 research students are enrolled under the supervision of different faculty members. Almost all faculty members are involved in intra and inter-university national and international collaborations of scientific research. The department houses one IUCAA Resource Centre, a Data Centre for Observational Astronomy, six teaching laboratories, several research laboratories and one departmental library. From time to time the department organizes Seminars, Symposia, Conferences, Schools, Refresher Courses, and Outreach Programs.

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Author: search.filters.author.Chatterjee, Suman

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Now showing 1 - 6 of 6
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    Study of DSSC dye using density functional theory
    (University of North Bengal, 2021-01) Talukdar, Avijit; Chatterjee, Suman
    The abstract should be one paragraph of between 150 and 250 words. It is not indented. Section titles, such as the word Abstract above, are not considered headings so they don’t use bold heading format. Instead, use the Section Title style. This style automatically starts your section on a new page, so you don’t have to add page breaks. (To see your document with pagination, on the View tab, click Reading View.) Note that all text styles for this template are available on the Home tab of the ribbon, in the Styles gallery.
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    Effect of Bias on The Solar Cell Characteristics
    (University of North Bengal, 2021-01) Debnath, Pratik; Chatterjee, Suman
    Considerable attention was created over the past decade on Dye-sensitized solar cells (DSSCs) as a viable alternate technology for renewable energy. Much attention was attracted due to their high efficiencies and potentially low production costs. In this paper, Dye-sensitized solar cells with natural dyes were successfully synthesized using ZnO nanostructures. ZnO nanorods were grown on an ITO coated glass using sol-gel method and used to fabricate DSSCs using natural dyes and liquid Potassium Iodide electrolyte. Different natural dye were analyzed for its suitability to be used in DSSC and subsequently used to fabricate the cell. Finally the photovoltaic properties of the ZnO based DSSC samples were systematically analyzed. Roles of new sensitizer dye were investigated and the results were compared. The ZnO nanorods grown by the sol-gel method have more uniform thickness. The DSSC structure with Carbon counter electrode yields an open circuit voltage markedly higher from DSSC on an ITO glass and has energy conversion efficiency less than 2%.
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    Electronic Band Structure and Density of States Analysis of Electron Transport Materials for Perovskite Solar Cells
    (University of North Bengal, 2021-01) Sarkar, Joy; Biswas, Rajat; Chatterjee, Suman
    For investigating the atomic-scale calculation of perovskite solar cells (PSCs), a detailed model of interaction between the electrons and the junctions is very essential. Such atomicscale level analysis is based on the quantum mechanical model. Therefore we need a Schrödinger equation which involves all the electrons with the associated junction potential. Here we consider the Schrödinger equation and solving it by full-potential linearized augmented plane wave (LAPW) method in Wien2k code through the Density Functional Theory (DFT). We have used generalized gradient approximation (GGA) given by Perdew-Burke-Ernzerhof (PBE) for the electronic band structure and Density of States (DOS) calculation of TiO2 and ZnO which are used in perovskite solar cell as the electron transport layer. We obtained the value of the energy bandgap as ~2.934 eV for TiO2 and ~3.119 eV For ZnO. We also determined the value of Fermi energy for both of the material. Finally, we compare the transport properties of TiO2 and ZnO by analyzing their band structure and DOS diagrams.
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    Investigation of Oxygen Sensing Capabilities and Relative Performance of Commonly Used Materials in A Combustion Environment
    (University of North Bengal, 2021-01) Roy, Chinmay; Chatterjee, Suman
    Several different oxygen sensitive materials have been synthesized and relative sensing capability was evaluated. Resistive response behaviors with varying oxygen gas concentration on TiO2, Nb2O5, WO3, La2CuO4, SrTiO3, SrCeO3 and La0.8Sr0.2MnO3 have been studied. The best operating temperature for maximum sensitivity was identified individually. The response at optimum temperature was calibrated for actual lean and rich combustion environment. The relative sensitivities with all pollutant gases present in combustion exhaust have been investigated in their relative concentration ranges.
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    Improvement of Photovoltaic Performance of Dye Sensitized Solar Cells by Pre-Dye Treating of Zno Nanoparticles
    (University of North Bengal, 2021-01) Biswas, Rajat; Sarkar, Joy; Chatterjee, Suman
    Dye sensitized solar cells (DSSC) were fabricated using Rose Bengal dye. Pure and pre-dye treated Zinc oxide (ZnO) nanoparticles were used to fabricate the photoanodes of two cells. The structural characteristics of ZnO nanoparticles were studied using X-ray diffraction analysis and the surface morphology by Scanning electron microscopy. The absorption property of the dye was studied using UV-VIS spectra. The pre-dye treatment has improved the properties of ZnO, such as reduced agglomeration, improved morphology, increased dye adsorption and reduced dye aggregation. Photovoltaic parameters like short circuit current density (JSC), open circuit voltage (VOC), fill factor (FF) and overall energy conversion efficiencies (η) for the conventional and pre-dye treated ZnO based fabricated cells were calculated to be 3.73 mA/cm2, 0.53 V, 0.63 and 1.26 % and 4.47 mA/cm2, 0.55 V, 0.62 and respectively. The pre-dye treated DSSC showed an improvement in short circuit current density (Jsc) by 19.84% and efficiency (η) by 21.43 %.
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    Array Of Nanostructured Sensor Elements For Determination of Tea Quality
    (University of North Bengal, 2021-01) Ghosh, Aparna; Roy, Chinmay; Chatterjee, Suman
    Detection of Volatile organic compounds is important for identification of flavour in different commercial organic products like Tea, Coffee, Wine, etc. The flavour components are detected through porous nanostructured Zinc Oxide (ZnO) sensing elements. This work shows the potential application of nanostructured gas sensor arrays for monitoring the quality of Indian tea.