▎ 摘　　要

NOVELTY - The method involves cleaning the black silicon substrate, and removing an oxide layer, oil stains and other impurities on the surface of the substrate. The graphene nanosheets, magnesium nitrate, and isopropanol are utilized to prepare the electrophoresis solution at a certain ratio, and to keep the liquid in an ultrasonic and heated environment during the preparation process, and to store in the environment. The graphite plate is utilized as the anode for electrophoresis and a black silicon substrate is utilized as the cathode in order to reduce the resistance value during electrophoresis. The electrophoresed substrate is maintained into 120 degrees c drying oven for drying. USE - Preparation method of three-dimensional stacked graphene-black silicon heterojunction (claimed). ADVANTAGE - The manufacturing cost of graphene-black silicon heterojunction is reduced, since process of graphene-black silicon heterojunction is simplified. The graphene-black silicon heterojunction is operated easily. The prepared three-dimensional stacked graphene osmium black silicon heterostructure has a wide absorption spectrum, high absorption rate and uniform characteristic. DESCRIPTION OF DRAWING(S) - The drawing shows a pictorial view of three-dimensional stacked graphene-black silicon heterojunction.