Browsing by Author "Sarkar, Joy"

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Open Access
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.
Open Access
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 %.
Open Access
Relation between stock market and select marco-electronic variables : A study on pre and post liberalization experiences in India
(University of North Bengal, 2022) Sarkar, Joy; Ray, Hirak; Dhar, Samirendra Nath
Open Access
The Impact of Carbon Price on Stock Market Returns: An Indian Experience
(University of North Bengal, 2021) Sarkar, Joy; Das, Raj
The rapid industrialisation is unquestionably considered as a key to achieve higher economic growth and development in modern civilization today. But, this in turn leads to higher carbon emissions and other GHGs. Ever since the Industrial Revolution; human – induced anthropogenic activities have resulted in huge emission of the GHGs due to which global warming has become a serious concern. Undoubtedly, higher industrial outputs add to the country’s growth but captivating profits at the cost of nature should not be continued. However, in 1997, with the emergence of the Kyoto Protocol, both developed and developing economies started to treat this matter seriously. Under this protocol the carbon credit system was established that imposed quotas on countries having more carbon emissions. Ever since then, the developing countries with less carbon emission generated carbon credits. This carbon credit can be traded actively in the international market at a certain market price to those developed economies with more carbon emission above the cap limit. This led to a rise in the carbon market to boost both the sustainable and environmental friendly practices among entities. Corporations that can reduce emission generate carbon credit, the right of which can be sold to entities that are emitting more CO2 and GHGs. Does this in any way affect corporate valuation and share price? This paper attempts to study the relationship between Carbon emission price and Indian stock market performance for a period covering FY 2008 to FY 2010. The research used simple regression analysis to test the relationship between dependent variables (BSE GREEENEX, BSE INDUSTRIALS, PCBL Ltd., Rain Industries and Reliance Industries) and independent variables (Carbon emission prices). This research is purely based on secondary data collected from websites, journals and other sources. This paper also tries to highlight the trends in the carbon market in India during the period of study.