Preparation method of molybdenum disulfide planar homojunction

The invention provides a preparation method of a molybdenum disulfide planar homojunction, which comprises the following steps of: placing a pretreated soda-lime glass substrate on the surface of a molybdenum foil A, covering the surface of the soda-lime glass substrate with a pre-oxidized molybdenum foil B, introducing inert gas and keeping a reaction cavity at normal pressure, and heating the molybdenum foil A/soda-lime glass substrate/molybdenum foil B to the melting temperature of the soda-lime glass substrate; placing a quartz boat containing powdered sulfur at the upstream of the inert gas, and heating the quartz boat to evaporate the powdered sulfur; and after the growth time is over, obtaining a single-layer/double-layer alternate molybdenum disulfide planar homojunction film with a single-crystal structure on the surface, close to the molybdenum foil B, of the soda-lime glass substrate. The method disclosed by the invention is simple, low in cost and free of environmental pollution, and can be used f