Method for controlling thickness of oxide layer on surface of gallium antimonide single crystal

Abstract

The invention discloses a method for controlling the thickness of an oxide layer on the surface of a gallium antimonide single crystal, and the method comprises the steps: carrying out the dewaxing treatment of a gallium antimonide polished wafer through a wax melting agent diluent, and then washing the dewaxed gallium antimonide polished wafer with deionized water; the gallium antimonide polished wafer is placed in an organic solution to be treated and then washed with deionized water; treating the gallium antimonide polished wafer with a chemical corrosive liquid, and then washing the gallium antimonide polished wafer with deionized water; and the gallium antimonide polished wafer is subjected to nitrogen sealing after being dried. The wax melting agent diluent, the organic solution and the chemical corrosive liquid are sequentially used for conducting surface wax melting process treatment on the gallium antimonide polished wafer, adsorption of surface particles can be improved, a natural oxide layer generated on the surface can be removed, the contact time of gallium antimonide single crystals and the external environment is shortened, and therefore the thickness of the oxide layer on the surface of gallium antimonide is effectively controlled, and the surface quality of the gallium antimonide polished wafer is improved. The use requirements of epitaxial materials are met.

Description

technical field [0001] The disclosure relates to the field of semiconductor material surface research, in particular to a method for controlling the thickness of an oxide layer on the surface of a III-V compound semiconductor material gallium antimonide single crystal. Background technique [0002] Gallium antimonide (GaSb) substrate is the key basic material for long-wave infrared detectors and focal plane arrays (FPA) in type II superlattice, and has good application prospects in the field of infrared technology. However, the chemical properties of the surface of GaSb material are active. When the surface is exposed to the air or processed by different processes, an oxide layer that cannot emit light but affects the luminous quality of GaSb material will be formed on the surface of GaSb material. The thickness and properties of the oxide layer will vary. Affects the deoxidation process of the subsequent epitaxial process. Therefore, removing the oxide layer on the surface...

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Problems solved by technology

[0003] The traditional surface treatment method of GaSb single crystal material is to use multi-step organic reagents for dewaxing treatment. The steps are cumbersome, the surface is heavily contaminated, and the contact with air is frequent during the treatment process, and the contact time with organic reagents is long, which will cause surface oxidation. The increase of layer thickness causes great differences in the thickness, composition, uniformity and compactness of the oxide layer formed on the surface of GaSb, and the properties of the surface oxide layer will directly affect the deoxidation temperature of the epitaxial process

The deoxidation temperature of the unfavorable surface oxide layer is very high, and the uneven oxide layer on the substrate surface will lead to incomplete deoxidation during molecular beam epitaxy; the island-shaped nucleation sites formed by the residual oxide layer will be deoxidized during the epitaxy process. Formation of microstructural defects that seriously affect the crystalline quality of the epitaxial layer

The structural instability of the surface oxide layer will increase its thickness when exposed to air, resulting in problems such as inability to deoxidize during epitaxy

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