Neda Ahmadi
Abstract
This study systematically analyzed a lead-free perovskite solar cell based on Cs₂PtI₆ (Cesium Platinum Iodide) using the Solar Cell Capacitance Simulator (SCAPS-1D). The investigation focused on the effects of perovskite layer thickness, operating temperature, and defect density on key photovoltaic ...
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This study systematically analyzed a lead-free perovskite solar cell based on Cs₂PtI₆ (Cesium Platinum Iodide) using the Solar Cell Capacitance Simulator (SCAPS-1D). The investigation focused on the effects of perovskite layer thickness, operating temperature, and defect density on key photovoltaic parameters, including the short-circuit current density, open-circuit voltage, fill factor, power conversion efficiency, and quantum efficiency. The model structure was utilized as a proposed n-i-p device architecture comprising ITO/TiO₂/Cs₂PtI₆/CBTS/Au.The results indicate that optimizing the perovskite layer thickness, provided it does not exceed the charge carrier penetration depth, can increase the efficiency by up to 29.2%. Conversely, increasing the operating temperature by approximately 110 K results in a 10.7% efficiency reduction. Furthermore, a significant decline in efficiency (36.8%) was observed due to defect-induced recombination within the perovskite layer. These findings highlight the importance of material optimization and operational stability in the design of efficient, lead-free perovskite solar cells.
Masome Naseri Tekyeh; rostam moradian
Abstract
The ZnSe and ZnSe/Cu thin films were successfully prepared using the vacuum evaporation progress. Their optical properties were investigated using UV-vis spectroscopy. The ZnSe thin film showed better transmission in the transparent region than the ZnSe/Cu thin film. The refractive index of the ZnSe ...
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The ZnSe and ZnSe/Cu thin films were successfully prepared using the vacuum evaporation progress. Their optical properties were investigated using UV-vis spectroscopy. The ZnSe thin film showed better transmission in the transparent region than the ZnSe/Cu thin film. The refractive index of the ZnSe sample depends on the wavelength at low wavelengths, but at wavelengths longer than 600 nm, it is independent of the wavelength and has a constant value of about 1.5. For the ZnSe/Cu sample, the refractive index slightly depends on the wavelength and has an almost constant value between 1.5 and 1.6. The samples' extinction coefficient decreases with increasing wavelength. Real and imaginary dielectric constants illustrated the same behavior as the refractive index and extinction coefficient. From this study, it can be indicated that both thin films with these optical properties are suitable for optoelectronic applications.
Seyedeh Robabeh Miry; Fatemeh Ahmadi
Abstract
In this article, we propose the teleportation of a state prepared as a superposition of a coherent state and a vacuum state, using a generalized hybrid entangled state. By considering a setup that includes a beam splitter and a photon detector, and under appropriate conditions, successful teleportation ...
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In this article, we propose the teleportation of a state prepared as a superposition of a coherent state and a vacuum state, using a generalized hybrid entangled state. By considering a setup that includes a beam splitter and a photon detector, and under appropriate conditions, successful teleportation of the entangled state composed of the coherent state and the vacuum state can be achieved. Furthermore, it has been shown that when considering entangled states of even or odd coherent states and the vacuum state, the success probability significantly increases to 0.5. These results indicate that the generalized hybrid entangled state plays a crucial role in the quantum teleportation of these states.
vahdat rafee; alireza razeghizadeh; mahtab farhadi
Abstract
This study explores the impact of natural pigments from eggplant peel and purple cabbage, combined with the synthetic pigment N719, on the power conversion efficiency of DSSC cells. Zinc oxide (ZnO) nanoparticles were synthesized using the Sol-Gel method and deposited onto the photoanode via the Doctor ...
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This study explores the impact of natural pigments from eggplant peel and purple cabbage, combined with the synthetic pigment N719, on the power conversion efficiency of DSSC cells. Zinc oxide (ZnO) nanoparticles were synthesized using the Sol-Gel method and deposited onto the photoanode via the Doctor blade technique. Five DSSC samples were sensitized with different dyes: DSSN1 with eggplant peel, DSSN2 with red cabbage, DSSN3 with N719, DSSN4 with a 1:1 mixture of eggplant and cabbage dyes, and DSSN5 with an equal mixture of eggplant, cabbage, and N719 dyes. X-ray diffraction (XRD) confirmed the hexagonal structure of ZnO with an average crystallite size of 32.30 nm. Scanning electron microscopy (SEM) showed a porous anode surface with nanoparticles averaging 28.46 nm, allowing efficient penetration of the electrolyte and dye. UV-Visible spectroscopy revealed that the three-dye combination had the broadest absorption spectrum (400–700 nm) and the lowest energy band gap (2.14 eV). Photovoltaic testing using a PnuAhwaz-SOL simulator showed that DSSN5 achieved the highest efficiency of 1.46%. Combining natural and synthetic dyes enhanced DSSC efficiency significantly. The cell sensitized with two natural dyes showed an 18% higher efficiency than with a synthetic dye, and the three-dye combination increased efficiency by 100%. This approach also offers low production cost and eco-friendly benefits.