BLACK PHOSPHORUS CRYSTAL WITH HIGH PHOTOELECTRIC RESPONSE RATE, TWO-DIMENSIONAL BLACK PHOSPHORUS PN JUNCTION, AND PREPARATION METHOD THEREFOR AND APPLICATION THEREOF

摘要

A black phosphorus crystal with a high photoelectric response rate, a two-dimensional black phosphorus PN junction, and a preparation method therefor and the application thereof. The black phosphorus crystal with a high photoelectric response rate is a single crystal with a space point group being Cmca(no.64), cell parameters being α ＝ 3.2 Å-3.4 Å，b = 10.4 Å-10.6 Å and c = 4.3 Å-4.5 Å, and an interlayer spacing being 4 Å-6 Å, and has the advantages of high photoelectric response rate, adjustable semiconductor type, etc.; and the preparation method therefor is simple, requires mild conditions, and has the advantages of high yield, low cost and low pollution. The two-dimensional black phosphorus PN junction comprises a two-dimensional black phosphorus thin film, n-type doping is performed on a first region of the thin film so as to form an n-type semiconductor, a second region is kept as a p-type semiconductor, and the first region is adjacent to the second region, so that a joining face of the n-type semiconductor and the p-type semiconductor forms a PN junction. The two-dimensional black phosphorus PN junction has the properties of unidirectional conductivity, special photovoltaic effect, etc., and the preparation method therefor is simple and efficient, has good repeatability, and is compatible with a conventional semiconductor process. The black phosphorus crystal and the two-dimensional black phosphorus PN junction have a wide application prospect in the field of photoelectricity and electronics.