Method for preparing orthorhombic crystal system black phosphorus single crystal

Abstract

The invention relates to a preparation method of an orthorhombic crystal system black phosphorus single crystal. The preparation method comprises the following steps: mixing phosphorus raw materials, metallic indium and stannic iodide; putting in a reactor; tightly sealing; preparing black phosphorus by improving and reducing the temperature through optimized procedures. The obtained black phosphorus is good in crystallization property and high in purity; in addition, the catalyst can be repeatedly used; a preparation process is low in requirement on equipment and easy for realization, and provides great convenience for subsequent application and development of the black phosphorus.

Description

technical field [0001] The invention belongs to the field of photoelectric semiconductor two-dimensional materials, and in particular relates to a preparation method of orthorhombic black phosphorus material. Background technique [0002] The rapid development of the semiconductor electronics industry has put forward higher requirements for the development of materials. Graphene has ushered in the era of two-dimensional materials, with its ultra-high carrier mobility (15000cm 2 / V*s) and other superior physical and chemical properties make it considered the most likely material to replace silicon, but the zero band gap limit the development of graphene. Similar to graphene, black phosphorus is a single-element two-dimensional material with van der Waals force between layers, and flake crystals with different layers can be obtained by exfoliation. Black phosphorus not only has graphene-like ultra-high carrier mobility (200~50000cm 2 / V*s), and its bandgap can be adjusted b...

AI Technical Summary

Problems solved by technology

However, the highly toxic and pyrophoric properties of white phosphorus limit the application of these methods

In 2007, Nilges, Tom utilized Au, Sn and SnI 4 As a combined catalyst, red phosphorus is heated to 600°C in a vacuum environment to obtain black phosphorus, but the introduction of noble metals increases the production cost and the purity of black phosphorus decreases; CA105133009A, CA105460910 and CA105565289 also published improvements to this method , but the requirements for temperature control and red phosphorus raw materials are higher, and the catalyst selection has certain limitations (only limited to Au, Sn, l 2 or their mutual reaction products) and have not been reused; in 2010, Cheol-Min Park used a high-energy ball mill to synthesize a composite material of red phosphorus and black phosphorus, but the high-energy ball mill method is difficult to accurately control the pressure and temperature inside the reactor , affecting the controllability of the preparation process

Therefore, the more commonly used synthesis methods are high-pressure (10kbar) methods, but these methods have extremely high requirements for experimental instruments.

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