Fraunhofer ISE and the venture company NexWafe, which was founded in July 2015, announced that it has developed silicon that can produce monocrystalline silicon solar cells at a cost of approximately one-half the original cost. Wafer technology. This can reduce the manufacturing cost of solar cell modules by 20%.
Previously, silicon wafers for monocrystalline silicon solar cells were manufactured using a lot of power and going through many processes. Specifically, hydrogen gas (H2) or the like is first used to reduce a gas composed of a chlorosilane compound such as HSiCl3 to produce polysilicon; then, polycrystalline silicon is melted at a high temperature of 1450 DEG C to make a monocrystalline silicon ingot; Special wire saw - diamond wire sawing thin, so as to make single crystal silicon.
Thinning produces a lot of swarf. According to Fraunhofer ISE, about one-half of monocrystalline silicon can become swarf. At present, the price of monocrystalline silicon ingots is around 2000 yen/kg, and 1,000 yen/kg or more will become chips.
The technology developed this time until H2 was mixed in trichlorosilane was the same as the original method. However, the single crystal silicon film is epitaxially grown on the silicon substrate subjected to the surface porous treatment by chemical vapor deposition (CVD). After the single crystal silicon film reaches a sufficient thickness as a wafer, the silicon substrate as a substrate is mechanically peeled. This silicon substrate can be reused dozens of times.
Single crystal silicon wafers such as Fraunhofer ISE that will be manufactured using this method are called "EpiWafer". Since no chips are produced, the production cost of the silicon wafer can be halved, and the power required to melt polysilicon or the like can be reduced by 80%. Solar cell module manufacturing costs can be reduced by 20%.
In addition, with this method, it is also easy to manufacture a 150 μm-thick silicon wafer that uses too much chips and is actually difficult to realize using a diamond wire saw, and a monocrystalline silicon thin film solar cell can be realized.
NexWafe has trial-produced solar cells using EpiWafer, and has confirmed that it can obtain up to 20% conversion efficiency. The company plans to start the EpiWafer pilot plant in early 2017 and begin mass production of the EpiWafer at a maximum of 250MW per year in the second half of 2017. (Reporter: Nozawa Tetsuo)
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