Superconductivity is a macroscopic quantum phenomenon. Over the past century of research on superconductivity, new superconducting material systems have emerged one after another, and the strange behaviors of superconductivity have been discovered constantly. At the same time, superconducting materials have important application value in energy, medical treatment, communication and other fields. In recent years, with the discovery of high temperature superconductivity of single-layer fese-srtio3 system, interface superconductivity and superconductor-base interaction become a new hot spot in the study of superconductivity. However, the preparation of single-layer superconductors requires extremely stringent conditions, including an ultra-high vacuum environment of 10-10 Torr, expensive molecular beam epitaxy (MBE) equipment, and specific monocrystalline substrates.
The results showed that the single layer NbSe2 deposited by CVD on the amorphous SiO2/Si substrate was superconductive and its critical temperature was 1.00k. In addition, as the thickness of NbSe2 increases, its superconducting critical temperature gradually increases and reaches 4.56 K at 10 layers.
Different from the strict requirements of MBE on the deposition substrate, CVD method can deposit NbSe2 on multiple substrates (including amorphous SiO2, quartz, graphene, BN, SrTiO3, etc.), so it is expected to be used to study the effect of single-layer nbse2-substrate interaction on superconductivity. In addition, the work revealed that single-layer TMD superconductors can be prepared using a simple CVD method at atmospheric pressure. This method is expected to be applied to the preparation and research of other two-dimensional superconductors (2h-tas2, 2h-tase2, 1t-cuxtise2, etc.).
