The Cs2AgBi0.75Sb0.25Br6 based perovskite solar cell (PSC) has demonstrated a high power conversion efficiency (PCE > 16%) and exceptional air stability. A comprehensive study of the interfaces in perovskite solar cells, coupled with the OPTIMIZATION of many parameters, is still necessary for further enhancement in PCE. This study quantitatively analyzes lead-free Cs2AgBi0.75Sb0.25Br6 utilizing a solar cell capacitance simulator (SCAPS–1D). The electron transport layer (ZnO) and the hole transport layer (Cu2O) were analyzed comparably. The work function, temperature, and THICKNESS of the PSC layers have been meticulously examined. The results indicate that the efficiency of the device is significantly influenced by the THICKNESS of the absorber layer. The simulation determined the maximum PCE of Cs2AgBi0.75Sb0.25Br6-based PSCs to be 16.23%, at THICKNESS 0.1μm of absorber layer with an open circuit voltage (Voc) of 1.3666 V, a short-circuit current density (Jsc) of 23.825 mA/cm², and a fill factor (FF) of 49.84%. Our exceptional results unequivocally indicate that Cs2AgBi0.75Sb0.25Br6- based PSCs are poised to emerge as the most efficient single-junction solar cell technology in the near future.

Introduction:In order to treat uveal Melanoma , first, radioactive seeds are laid on a silicone- made substance which is called Silastic after that they are inserted in the plaque, and finally, this plaque containing silicone-made substance is stitched to the sclera surface. The dose gradient within the tumor and healthy tissues can be varied due to changing the Silastic THICKNESS between sclera surface and radioactive seeds. In turn, this leads to difference in the amount of absorbed dose of tumor and healthy tissues. Present study is to investigate the optimum Silastic THICKNESS in uveal Melanoma brachytherapy.Materials and Methods:To measure changes of depth dose of the plaque in a sphere with a radius of 12 mm, MCNP4C code was applied. Exact specifications of a 20-mm Collaborative Ocular Melanoma Study (COMS) plaque, Silastic and three I-125 seed sources, 6711 model were integrated in simulation. Dose calculations were performed using F6 tally in spheres with a radius of 0.2 mm.Results:By measuring the changes of dose rate of plaque in distances of 0.2 to 18 mm from the sclera surface and having the prescribed dose for the absolute treatment of eye melanoma, final absorbed doses by tumor and healthy tissues for each different Silastic THICKNESSes of 0, 0.5, 1, 1.5, and 2 were calculated.Conclusion:Considering the results and sclera tolerance, it was concluded that the THICKNESS of Silastic must not exceed 0.5 mm, because increasing the Silastic THICKNESS from this area, increases absorbed dose by healthy tissues and also the treatment time.

Due to developments in additive manufacturing, the production of piezoelectric materials with complex geometries is becoming viable and enabling the manufacturing of thicker harvesters. Therefore, in this study a piezoelectric harvesting device is modelled as a bimorph cantilever beam with a series connection and an intermediate metallic substrate using the plane strain hypothesis. On the other hand, the THICKNESS of the harvester’ s piezoelectric material is structurally optimized using a discrete topology OPTIMIZATION method. Moreover, different OPTIMIZATION parameters are varied to investigate the algorithm’ s convergence. The results of the OPTIMIZATION are presented and analyzed to examine the influence of the harvester's geometry and its different substrate materials on the harvester’ s energy conversion efficiency.

This research designed and simulated CIGS/CIGS back-to-back solar cells using Silvaco-Atlas software. We considered CIGS absorbing layer THICKNESS and sub-cells as critical parameters to optimize the performance of the CIGS/CIGS tandem solar cell. The research comparatively examined the effect of different electrode metals, such as molybdenum, aluminum, titanium, and silver, on the efficiency. The electrical parameters of the best CIGS/CIGS tandem solar cell configuration were a short-circuit current density (Jsc) of 15.65 mA/cm², an open-circuit voltage (Voc) of 1.86 V, a fill factor (FF) of 86.04%, and a conversion efficiency (η) of 27.12%. The optimal CIGS absorbing layer THICKNESS of the top and bottom cells corresponding to the maximum conversion efficiency obtained were 0.17 and 6.3 μm, respectively. In contrast, the optimal THICKNESS of the Cds layer was 0.04 µm. Silver had the best performance in connecting layers between several metals. The results can be used to develop low-cost and high-efficiency solar cells.