Exploring the Theoretical Limits of Efficiency in Multilayer Solar Cells

Photovoltaic materials are recognized for their potential as sustainable energy sources that enable the conversion between light and electrical energy. However, solar cells have been unable to surpass the theoretical limit of 32%, known as the Shockley-Queisser limit, and face challenges in effectively utilizing the broad spectrum of sunlight. To address this issue, extensive research is being conducted on multi-junction solar cells, which employ a layered structure comprising materials with varying bandgaps to more effectively harness the wide spectrum of sunlight. This study calculates the theoretical limit of these multi-junction solar cells and identifies optimal bandgap combinations, exploring new possibilities for photovoltaic devices and suggesting directions for technological advancement. This research presents new opportunities beyond the limitations of current solar cell technology and is expected to contribute to enhancing the economic viability and practicality of solar power as a sustainable energy source.