2017/01/23 by Yuting Ye, Ye, Yuting, Qiangbing Guo +11
Earth and Planetary Sciences · Engineering · Materials Science · #Chalcogenide Semiconductor Thin Films #Crystal Structures and Properties #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mineralogy and Gemology Studies
paper · pdf · doi:10.48550/arxiv.1701.06285
openalex publication_date 2017/01/23 · openalex created_date 2017/02/03 · openalex updated_date 2026/07/28
Monochalcogenides of germanium (or tin) are considered as stable isoelectronic and isostructural analogue of black phosphorous. Their two-dimensional (2D) forms have been just predicted to shown strong thickness-dependent physical properties, and even indirect to direct band gap crossover at the monolayer limit. Here, we demonstrate the synthesis of atomically thin GeSe by direct sonication-assisted exfoliation of bulk microcrystalline powders in solvents. The exfoliated few-layer GeSe sheets characterize high crystallinity with lateral sizes over 100 nm and, importantly, strong resistance against oxidation and degradation in ambient conditions. Density functional theory calculation combined with optical characterizations confirm the layer-number dependent optical bandgap, which, for few-layer sheets, is optimal for solar light harvesting, and promising for relevant applications, such as optoelectronics and photonics.