What Methods Are Used to Fabricate Polysilicon Wafers

What is Polysilicon Wafers Used For?

Polysilicon is the highly-purified version grey silicon metal made of quartz. Polysilicon is integral in the fabrication of semiconductor devices and solar cells. The material has trended more toward solar industry as the demand for clean energy has also increased.

In 1995 polysilicon was 90% of semiconductor device fabrication. While only 10% was used for solar. In 2014 those numbers flipped with 90% of polysilicon is fabricated for solar panels!

Get Your Quote FAST!

How to Fabricate Polysilicon Wafers

Polysilicon, or simply polysilica, is a natural compound, comprising of silicon crystal cells arranged in an orderly manner. The crystal cells are electrically excited by an electric field, and the silicon atoms arrange themselves into a crystalline structure. The electrical charge then causes the silicon to emit either heat or a vapour which can be used as fuel for gas turbines. This is how polysilicon finds application in the world of solar energy. Solar panels work on the principle that when solar energy is converted to electrical energy, heat is lost, so a second source of power is required. Polysilicon, the power source is silicon crystals, and this is how the liquid process solar energy to provide the flow of electric current.

polysilicon fabrication using the siemens process S

o how does the Siemens process work? Solar fluid is pumped into a container filled with a crystalline salt solution. The liquid bed, containing the silicon crystals, absorbs the heat from the sun, and the salts in the water to cool the silicon down. This cooling effect is what makes the crystalline salt possible to use in the Siemens fluid bed reactors. Once cooled, the liquid is drawn up into the pipes of the fluid bed, where it acts as a coolant, drawing the heat away from the silicon.

The fluid bed can be positioned anywhere. The polysialic, containing the energy needed to drive the electricity through a PV array, acts like a very efficient heat sponge. The heat from the sun is absorbed into the silicon and then is extracted and stored into the unit. The unit contains a liquid, and this liquid is pumped into the fluid bed in a continuous process. A control unit is usually placed inside the fluid bed, to ensure that the constant pumping of the fluid bed does not affect the electrical wiring

Each day, the PV array is fed with energy, which it uses to create heat. This heat is pumped into the fluid bed and stored there until it is needed. The fluid used for this process is known as the "saltic liquid."

The benefits of using solar energy in the home are many. If the power outages do occur, then the stored energy can help keep the lights on. This also helps keep the central air conditioning system operational, because the constant flow of energy into the unit will keep the blower running smoothly. Since the polysilica is also an insulator, the panels will remain cooler during a hot summer, keeping your home cooler.

When the PV array is fully operational, the sunlight that shines on the panels, converts them to electricity. The stored energy then goes back into the polysilica tank, along with the unused electricity generated by the sun. Many experts believe that polysilica, along with other organic compounds, are the perfect combination to make an environmentally friendly solar panel. Other organic compounds will not work as well.

Polysilica is made up of tiny crystalline particles. These crystalline particles are larger than water, but smaller than sand. A scientist named Reinhold Voll, learned about these unique crystalline properties when he made some research into how fluid behaves. He realized that these tiny crystals can help channel the heat away from objects, keeping them cool. He was able to devise a way to perfectly mimic the fluid behavior that he saw in crystals, and this discovery eventually led him to develop the polysilica.

Since the PV cells in the solar panels absorb sunlight and then emit that energy as heat, the polysilica acts as an insulator. As the sun's light hits the PV cells, the liquid crystalline is sprayed onto the surface of the PV cell. This liquid crystalline keeps the surface of the PV cell clean and free of dust. Over time, this crystalline coating begins to harden. This hardening allows more of the energy absorbed by the silicon to escape. In this way, the polysilica acts as a barrier to prevent the flow of heat.

So how does the Siemens process work? Solar fluid is pumped into a container filled with a crystalline salt solution. The liquid bed, containing the silicon crystals, absorbs the heat from the sun, and the salts in the water to cool the silicon down. This cooling effect is what makes the crystalline salt possible to use in the Siemens fluid bed reactors. Once cooled, the liquid is drawn up into the pipes of the fluid bed, where it acts as a coolant, drawing the heat away from the silicon.