Synthesis of uniform two-dimensional non-layered ?-MnSe by molecular sieves modified chemical vapor deposition

Large-area and uniform two-dimensional (2D) non-layered alpha-MnSe was successfully synthesized via the molecular sieve modified chemical vapor deposition (CVD). The molecular sieve serves both as a filter and a container to controllable release the Mn precursor in a stable and much lower concentration, leading to the uniform growth of 2D alpha-MnSe flakes. The thickness, crystalline quality and uniformity of the as-grown alpha-MnSe are further characterized. Our study validated the positive role of molecular sieve in the controllable growth of 2D alpha-MnSe, which is believed to be applicable to other non-layered transition metal chalcogenides (TMCs) and will be beneficial for their further applications in electronics, optoelectronics and spintronics.