Preparation method for orderly silicon nanowire array

Abstract

The invention relates to a preparation method for an orderly silicon nanowire array. A porous alumina template and metal auxiliary chemical corrosion are combined to obtain the orderly silicon nanowire array. The preparation method for the orderly silicon nanowire array comprises the following steps: sequentially depositing a SiO2 film and an aluminum (Al) film on a clean silicon chip surface; then anodizing the aluminum (Al) film to form porous aluminum oxide (AAO); etching on the silicon surface by means of plasma with the AAO as the masking to copy a hole array graph of the AAO; removing AAO layer and SiO2 layer, depositing a gold film on a graphical silicon surface, and obtaining a gold layer of a mesh structure; enabling a sample of the gold film which is covered with the mesh structure to be immersed into hydrofluoric (HF) acid and H2O2 corrosive liquid to corrode, and finally obtaining a silicon nanowire array. The preparation method for the orderly silicon nanowire array is easy, and a large-area orderly and vertically arranged silicon nanowire array can be prepared; the facts that trends, doping types and levels, diameters, lengths, separation distances, surface densities and the like of the nanowire array are effectively controlled can be achieved, and cost is low, and therefore the preparation method for the orderly silicon nanowire array can be used for a device based on a silicon nanowire array.

Description

technical field [0001] The invention relates to a preparation method of silicon nanowires, in particular to a preparation method of a vertical silicon nanowire array with large-area arrangement, uniform and controllable diameter and length, and belongs to the technical field of nanomaterial preparation and application. Background technique [0002] Silicon nanowires have attracted widespread attention due to their excellent properties and good process compatibility, and have great stress prospects in advanced electronic devices, biological and chemical sensors, optoelectronic devices, and photovoltaic devices. The controllable preparation of silicon nanowires is a prerequisite for its application. Various top-down and bottom-up techniques, such as solid-liquid-gas (VLS) growth, electrochemical etching, reactive ion etching, and metal-assisted chemical etching, all have significant influence on the relevant parameters of nanowires. A certain amount of control. Among them, V...

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Problems solved by technology

Reactive ion etching needs to be combined with photolithography to form a mask, which is costly and inefficient

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