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The resulting hole and the electron are attracted to each other in accordance with Coulomb's law, giving rise to bound electron-hole pairs that remain stable at room temperature. The electron moves to a higher energy level, known as the conduction band, where it can move freely. When light is absorbed, an electron vacates its original position in the valence band, leaving behind a positively charged hole. Single-layers of molybdenum disulfide offer absorption capacities in this range. There are already van der Waals heterostructures that absorb up to 100% of light. The interactions between the different layers can give the resulting material entirely new properties. Of special interest are van der Waals heterostructures, which are made up of individual layers of different materials held together by van der Waals forces. Novel two-dimensional materials are currently a hot research topic around the world. The new structure's particular properties reportedly make it a candidate for applications in optical components or as a source of individual photons, which play a key role in quantum research. Credit: Nadine Leisgang and Lorenzo Ceccarelli, Department of Physics, University of Basel Schematic illustration of the electron-hole pairs (electron: pink, hole: blue), which are formed by absorption of light in the two-layer molybdenum disulfide layer. Physicists at the University of Basel have created a novel structure with the ability to absorb almost all light of a selected wavelength, by layering different 2D materials: graphene and molybdenum disulfide.