Browsing by Author "Salem, Marwa S"

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    Evaluation of a proposed barium di‑silicide tandem solar cell using TCAD numerical simulation
    (Springer New York, 2023-04) Okil, M; Shaker, Ahmed ; Ahmed, Ibrahim S; Abdolkader, Tarek M; Salem, Marwa S
    Barium di-silicide (BaSi2) material has attracted noteworthy interest in photovoltaics, thanks to its stability, abundant nature, and excellent production feasibility. In this current work, a two-terminal (2T) monolithic all-BaSi2 tandem solar cell is proposed and explored through extensive TCAD simulation. A BaSi2 bottom sub-cell with a bandgap of 1.3 eV, and a Ba(CxSi1−x)2 top sub-cell with a tunable bandgap are employed in the design. It was found that a bandgap of 1.8 eV, which corresponds to x=0.78, is the optimum choice to obtain the maximum initial power conversion efciency (η) of 30%. Then, the tandem performance is optimized by investigating the impact of doping and the thickness of both absorber layers. Further, the current matching point is monitored whilst altering the thick- ness of the top cell resulting in η=32.83%%, and a short-circuit current density (Jsc) of 16.47 mA/cm2 . Additionally, we have explored the infuence of the defect density in the absorbers, and the work function of contacts on the performance parameters. All TCAD simulations are accomplished using the Silvaco Atlas package under AM1.5G illumination
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    Wide-bandgap Cesium-Formamidinium-Based Perovskite for Possible Indoor Applications: TCAD Simulation Study
    (Springer New York, 2024-05) Salem, Marwa S; Shaker, Ahmed ; Abouelatta, Mohamed ; Zekry, Abdelhalim ; Gontrand, Christian ; Aledaily, Arwa N; Zein, Walid 
    This study investigates the potential of Cesium−formamidinium-based (CsyFA1−yPb(IxBr1−x)3) perovskite materials as promising candidates for efcient and stable perovskite solar cells (PSCs), that can be tailored for indoor applications. These materials ofer the unique advantage of simultaneously stabilizing photoactive compositional phase transitions and enhancing thermal stability, making them well-suited for indoor environments. The optical band gaps of Cesium−formamidinium, ranging from 1.5 to 1.8 eV, can be engineered to align with the spectrum of light sources commonly used indoors. Therefore, this study directs into the design and simulation of Cesium-FormamidiniumBased PSCs, with a specifc emphasis on optimizing their performance under indoor LED illumination. Parameter manipulation related to the Hole Transport Layer (HTL) and Electron Transport Layer (ETL) is utilized to establish optimal band alignment in order to reduce recombination losses and boost power conversion efciency. A co-design approach between the ETL and HTL is introduced, enabling precise engineering of interfaces, and optimizing charge transport and collection efciency. This research presents an optimal design with a conduction band minimum (VBM) energy level of 4.05 eV for the ETL and a valence band maximum (VBM) energy level of 5.15 eV for the HTL, resulting in a power conversion efciency (PCE) of 25.00%, and an open-circuit voltage (Voc) of 0.939 V.