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Author: search.filters.author.Garg, V.Subject: search.filters.subject.Cesium compounds

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    Unveiling the Potential of Cs3Sb2ClxI9-x-Based Solar Cells for Efficient Indoor Light Harvesting: Numerical Simulation
    (John Wiley and Sons Inc, 2024) Manjhi, S.; Siddharth, G.; Pandey, S.K.; Sengar, B.S.; Garg, V.
    Lead-free Perovskite-inspired materials (PIM) have become the most promising candidate for indoor photovoltaics (IPV) because of their low toxicity and high performance. In this study, the potential of one of the lead-free PIMs, Cesium antimony chloride iodide (Cs3Sb2ClxI9-x), is explored for IPV devices. Recent experimental research work on a Cs3Sb2ClxI9-x− based solar cell with a power conversion efficiency (PCE) of 3.7% is considered for the baseline model development. The device performance is further optimized by investigating 1) absorber thickness and defect density, 2) band alignment of Electron Transport Layer (ETL)/Absorber, ETL Doping concentration and absorber/ETL interface defect density, 3) band alignment of Hole Transport Layer (HTL)/Absorber, HTL Doping concentration, and absorber/HTL interface defect density, 4) work function of metal contacts, 5) series and shunt resistances. After device optimization, the simulated device under 1000 lux WLED is able to achieve Jsc, Voc, FF, and PCE of 1.8 mA cm−2, 1.46 V, 89.3%, and 45.05%, respectively. Further, an evaluation of the performance of the optimized device under various indoor light sources, including White Light Emitting Diode (WLED), halogen, and Compact Fluorescent Lamp (CFL), is conducted in order to assess its performance under widely utilized lighting conditions. © 2024 Wiley-VCH GmbH.
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    Comprehensive Modeling of High-Performance All-Inorganic Cs2TiBr6-Based Perovskite Solar Cells
    (John Wiley and Sons Inc, 2024) Kumar, S.; Thiyyakkandy, J.; Yadav, A.K.; Vinturaj, V.; Garg, V.; Prabhu, S.; Pandey, S.K.
    The perovskites are desirable materials for photovoltaic and other renewable green energy technologies. Lead-based perovskite solar cells (PSC) have recently gained considerable attention due to the abrupt rise in power conversion efficiency, but lead's well-known toxicity prevents its large-scale commercialization. One compelling option is Cs2TiBr6, which offers a nontoxic alternative. Herein, the electronic and optical characteristics of Cs2TiBr6 absorber material using density functional theory employing the WIEN2K tool are investigated. The energy band structure of Cs2TiBr6 shows an indirect bandgap of 2.2 eV. Additionally, optical properties are calculated, and the suitability of this material as an absorber for indoor and outdoor photovoltaic devices is investigated. The Cs2TiBr6 material has a peak absorption coefficient of 39.57 × 104 cm−1 and optical conductivity of 1.98 × 1015s−1, demonstrating its suitability as an absorber material. After that, a PSC is modeled using SCAPS-1D by using the computed parameters. The performance of the modeled perovskite is enhanced by optimization of various parameters, resulting in the achievement of a high-performance Cs2TiBr6-based PSC, boasting a power conversion efficiency of 19.9% for air mass AM1.5 G spectra and power conversion efficiency of 16.76% for light emitting diode and 17.18% for incandescent light for indoor light conditions. © 2024 Wiley-VCH GmbH.