Princeton University official website announced on March 21 that the school's researchers found that α-selenide (α-GeSe) compounds can be converted to another new form (β-GeSe) under certain conditions, with graphene A similar annular structure, and the layered structure is more like a "ship" shape, showing superior electrical conductivity. Related papers are published in the Journal of the American Chemical Society.
Graphene is a two-dimensional material with magical electrical properties, but due to the lack of bandgap, the development of graphene electronic devices has been severely hindered for many years. In recent years, the material that is very close to it, black phosphorus, has attracted the attention of researchers because of its certain band gap and high charge transport capability. In particular, black phosphorus can be converted into a simple "chair"-shaped three-dimensional structure under high pressure, and the electrical performance can be greatly improved.
Alpha-selenide is abundant in nature, and researchers have estimated that it has the same electrical properties as black phosphorus. In the latest research, the Princeton University team heated alpha-selenide to 1200 °C at 60,000 atmospheres. It was found that it not only evolved into a "chair"-like structure like black phosphorus, but also evolved into a Amazing "boat" structure. The first author of the paper, Fabian Van Rohr, believes that different structures determine the different electrical properties of these compounds. Compared with the standard "chair"-shaped black phosphorus and α-selenide, the "boat"-shaped β-selenide has a smaller interlayer distance, a more stable layer structure, and better electrical performance.
The researchers also found that both forms of selenium telluride have a wider band gap than black phosphorus, which means they have more potential than black phosphorus. Moreover, black phosphorus exhibits extremely high chemical activity in air or in aqueous solution, but selenium selenide is more stable and becomes another attractive advantage for the development of electronic products.
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