Wednesday 16 April 2025
The pursuit of more efficient solar cells has led researchers down a path of discovery, uncovering new materials with promising properties. A recent study published in Phys. Rev. Materials shines a light on two half-Heusler compounds, LiZnAs and ScAgC, which show great potential for photovoltaic applications.
The team behind the research employed a range of techniques to analyze the electronic and optical properties of these materials. By combining density-functional theory with many-body excited-state calculations, they were able to gain insight into the behavior of quasiparticles – excitations that arise when electrons and holes interact in semiconductors.
The results indicate that both LiZnAs and ScAgC exhibit direct band gaps, a characteristic often sought after in photovoltaic materials. The calculated values of these band gaps range from 1.5 to 1.0 eV, depending on the material and method used. Additionally, the team found that the highest value of the imaginary part of the dielectric function is observed at the direct optical band gap, a sign of intense optical absorption.
Excitons, highly bound electron-hole pairs, play a crucial role in the solar energy absorption process. The study reveals that both materials demonstrate triply degenerate bright excitons (exciton A) below the direct optical band gap, with binding energies ranging from 45 to 56 meV. These excitons are found to be localized around the band gap region in reciprocal space, but highly delocalized in real space.
The team also computed the solar efficiency of both materials using the spectroscopic limited maximum efficiency (SLME) model. The results indicate SLME values of approximately 32% for LiZnAs and 31% for ScAgC at a layer thickness of around 0.4 micrometers. These values are promising, suggesting that these materials could be viable alternatives to traditional photovoltaic absorbers.
The discovery of these new half-Heusler compounds is significant, as they offer a potentially more efficient way to harness solar energy. The properties of LiZnAs and ScAgC make them attractive candidates for the development of next-generation single-junction thin-film solar cells. Further research will be necessary to fully understand the behavior of these materials and to optimize their performance. However, the initial findings are encouraging, paving the way for a new generation of solar cells that could potentially increase energy production while reducing costs.
Cite this article: “Unlocking the Secrets of Half-Heusler Semiconductors: A High-Throughput Study on Their Optoelectronic Properties”, The Science Archive, 2025.
Solar Cells, Half-Heusler Compounds, Photovoltaic Applications, Density-Functional Theory, Many-Body Excited-State Calculations, Quasiparticles, Excitons, Binding Energies, Solar Efficiency, Spectroscopic Limited Maximum Efficiency (Slme) Model
