The silicon rod has gained popularity as a material for use in a variety of electronics products, whether it is for use as an insulator, transistor, laser diode, or any other use. Despite being a solid material, silicon can be formed into a variety of shapes, which opens up a wide range of potential applications. Understanding a silicon rod's microstructure and manufacturing energy requirements is also crucial.
The preforming of various fiber kinds is one of silicon rods' typical uses. The rod's primary purpose in this application is to create mechanical stress in fibers. Additionally, it is employed in the manufacture of photonic crystal fibers. A popular material for these applications is silicon nitride. High wear resistance, high strength, and resistance to thermal shock are some of its characteristics. Rapid production of the rod is possible using gas feedstock. Additionally, it performs well while pulling CZ crystals. Additionally, it has a variety of uses in the semiconductor sector.
Pores and fissures define the polycrystalline silicone tips structural characteristics. The rod's total porosity ranges from 0.01 to 0.2. The temperature of the rod can be used to regulate this porosity. It should ideally be between 0.01 and 0.2.
Thermal breakdown of a highly refined reactant gas results in the production of polycrystalline silicon rods. It could be an inert gas or hydrogen gas. In the reactant gas, silicon-containing chemicals typically range in concentration from 3 to 30 mol%. The flow rate of the reaction gas is also managed. The preferred range is 6 to 60 kg/h per 1 m2 of rod surface.
Polycrystalline silicon rods are typically categorized based on their size and shape. These rods have a polycrystalline coating on their exterior that ranges in thickness from 0.01 to 20 mm. The rod benefits from the qualities of this layer. In addition, the microstructure of the outer layer differs from that of the inner deposited layers.
Additionally, the behavior of these novel polycrystalline silicon rods in acidic conditions differs. Additionally, these rods have an unique microstructural mechanism that does not change the way the rods fracture.
These rods' outer layer is distinguished by a rough microstructure. A precise microstructure defines the inner layer.
The associated procedure is detailed in US 2010/219380 A1. Innovative polycrystalline silicon rods display a superb microstructure. The rods had a lustrous gray finish. They exhibited a 5.6 mm surface roughness. By sawing and polishing the surface, these rods are made.
The novel polycrystalline silicon product display an unexplored microstructural mechanism in the prior art. The alteration of the crystallite structure that results in better pulling performance is caused by the creation of a thin layer between 0.1 and 20 mm.
One crystal rod can be produced via floating zone pulling of polycrystalline silicon rods. The completed rod has an 8 mm maximum diameter. Photovoltaic solar cells can utilise it. Producing high purity crystals is possible because to floating zone technology.
Different processes can be used to create polycrystalline silicon rods. One of the most popular techniques is a high-frequency induction coil that has been melted onto the rod's top end. The rod is then cooled until it reaches room temperature. The disc is then separated from the rod by making a perpendicular cut to the rod's axial direction. The disc is next polished and ground on one side.
As silicone is deposited, the completed rod's diameter grows. High thermionic stresses create a fine-crystalline matrix in the outer area of the polycrystalline Si rod. Strength and rigidity are improved by the fine-crystalline matrix. Additionally, it avoids bruising on the rod's exterior.
China produced 78 percent of the world's polysilicon over the previous year. This comes as a result of the Chinese government's implementation of a number of incentives to aid in boosting silicon production capacity. But many firms cannot afford silicon since it is still incredibly expensive to produce in China. More energy-efficient techniques have been created in an effort to lower the price of generating silicon.
The Siemens Process is one way of making polysilicon. This process has been around for a while and is thought to be the most trustworthy one for refining polysilicon. It also has substantial energy expenses, though.
Polycrystalline silicon rods are heated in the Siemens Process until they melt at one end. After that, slices are made from the rods. The ability to reuse the rods is made feasible by the recycling of silicon.
The monosilane-fed FBR process utilizes a third less energy than the standard approach, and it consumes two-thirds less energy per kilogram of polysilicon. The overall cost of production has decreased as a result of this.
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