Abushattal, Ahmad A.García Loureiro, Antonio JesúsBoukortt, Nour El I.2025-04-232025-04-232024Abushattal, A. A., Loureiro, A. G., & Boukortt, N. E. I. (2024). Ultra-High Concentration Vertical Homo-Multijunction Solar Cells for CubeSats and Terrestrial Applications. Micromachines, 15(2), 204. https://doi.org/10.3390/mi15020204https://hdl.handle.net/10347/40986This paper examines advances in ultra-high concentration photovoltaics (UHCPV), focusing specifically on vertical multijunction (VMJ) solar cells. The use of gallium arsenide (GaAs) in these cells increases their efficiency in a range of applications, including terrestrial and space settings. Several multijunction structures are designed to maximize conversion efficiency, including a vertical tunnel junction, which minimizes resistive losses at high concentration levels compared with standard designs. Therefore, careful optimization of interconnect layers in terms of thickness and doping concentration is needed. Homo-multijunction GaAs solar cells have been simulated and analyzed by using ATLAS Silvaco 5.36 R, a sophisticated technology computer-aided design (TCAD) tool aimed to ensure the reliability of simulation by targeting a high conversion efficiency and a good fill factor for our proposed structure model. Several design parameters, such as the dimensional cell structure, doping density, and sun concentrations, have been analyzed to improve device performance under direct air mass conditions AM1.5D. The optimized conversion efficiency of 30.2% has been achieved with investigated GaAs solar cell configuration at maximum concentration levels.eng© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/GaAs solar cellTCADSimulationVertical-multijunction solar cellCubeSatsAir mass 1.53307 Tecnología electrónicajournal article10.3390/mi150202042072-666Xopen access