Advanced Tuning of Optoelectronic and Structural Parameters in Cs2AgBiI6-Based Lead-Free Perovskite Solar Cells: Toward 28.95% Efficiency Sagar Bhattarai, Priyanka Roy, Nikhil Shrivastav, Pratap Kumar Dakua, Rahul Pandey, Jaya Madan Chemistryselect, 2026 Lead‐free perovskite solar cells (PSCs) have engrossed substantial consideration from certain years for its promising photovoltaic (PV) outputs. This work includes a detailed discussion of the relative parameters of the PSC configurations, that is, ITO/ZnO/Cs 2 AgBiI 6 / Spiro‐OMeTAD/Ag, composed of a lead‐free, cesium‐based PSC. The Cs 2 AgBiI 6 ‐based PSCs offer high output parameters as compared to the outputs of methyl ammonium (MA)—based PSCs. Optimizing the bulk defect density (BDD) of perovskite materials is one of the best methods for reaching high efficiency, aside from physical factors like thickness. Additionally, SCAPS‐1D software is used to tune optoelectronic parameters J – V and QE in order to achieve high efficiency. The optimum PV parameters attained the output of J SC nearly 22.07 mA/cm 2 , V OC of 1.48 V, FF about 87.56%, and power conversion efficiency (PCE) of 28.95%, respectively.
Photovoltaic Performance of Lead-Free Na2GeBr6 Perovskite Investigated via Density Functional Theory and SCAPS-1D Modeling Aparna Dixit, Jisha Annie Abraham, Abhishek Kumar Mishra, Jaya Madan, Rahul Pandey, Nikhil Shrivastav, Yedluri Anil Kumar, Ramesh Sharma Energy Technology, 2026 Alkali metal–based perovskites offer a promising alternative to toxic lead‐based perovskite solar cells. Although lead‐free perovskites typically provide broader absorption, their stability remains a concern. Vacancy‐ordered perovskites, such as Na 2 GeBr 6 , exhibit enhanced stability and possess an appropriate bandgap for photovoltaic applications. In this study, we integrate density functional theory (DFT) and SCAPS‐1D simulation to explore the photovoltaic potential of Na 2 GeBr 6 . Initially, DFT‐based material characterization is performed to analyze the crystal structure and density of states (DOS), along with the evaluation of the dielectric and optical properties. The calculated spectroscopic limited maximum efficiency (SLME) further validates the suitability of Na 2 GeBr 6 as an absorber material. Subsequently, device simulation is conducted using SCAPS‐1D to examine the influence of absorber parameters, such as thickness, bulk defect density, and intrinsic defect states (Interface defect density between C60 / Na 2 GeBr 6 (IDD1) and Interface defect density between Na 2 GeBr 6 /Me‐4PACz (IDD2)) on the device performance. The optimized device achieves a power conversion efficiency of 13.41%, with a short‐circuit current density ( J SC ) of 19.44 mA/cm 2 , an open‐circuit voltage ( V OC ) of 0.932 V, and a fill factor (FF) of 74.01%. These results highlight the potential of Na 2 GeBr 6 as a stable and efficient lead‐free absorber material for next‐generation perovskite solar cells.
Understanding Auger recombination in perovskite solar cells Ali K. Al-Mousoi, Mustafa K. A. Mohammed, Anjan Kumar, Rahul Pandey, Jaya Madan, Davoud Dastan, M. Khalid Hossain, P. Sakthivel, G. Anandha babu, Zaher Mundher Yaseen Physical Chemistry Chemical Physics, 2023
A Low-Power gm-C Filter for Neural Signal Conditioning Preeti Sharma, Kulbhushan Sharma, Jaya Madan, Rahul Pandey, H. S. Jatana, Rajnish Sharma Proceedings of 2nd International Conference on VLSI Device Circuit and System VLSI Dcs 2020, 2020
Threshold voltage model of a hetero gate dielectric dual material gate GAA tunnel FET Nsti Advanced Materials Techconnect Briefs 2015, 2015
TCAD analysis of small signal parameters and RF performance of heterogeneous gate dielectric-gate all around tunnel FET Nsti Advanced Materials Techconnect Briefs 2015, 2015
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