Advance Could Challenge China's Solar Dominance

Technology Review
Nov 21, 2011

The new DSS450 Monocast furnace can make high-grade monocrystalline silicon at a fraction of the cost of conventional equipment. Credit: GT Advanced Technologies

Chinese solar-panel manufacturers dominate the industry, but a new way of making an exotic type of crystalline silicon might benefit solar companies outside of China that have designs that take advantage of the material.

GT Advanced Technologies, one of world's biggest suppliers of furnaces for turning silicon into large crystalline cubes that can then be sliced to make wafers for solar cells, recently announced two advanced technologies for making crystalline silicon. The new approaches significantly lower the cost of making high-end crystalline silicon for highly efficient solar cells.

The first technology, which GT calls Monocast, can be applied as a retrofit to existing furnaces, making it possible to produce monocrystalline silicon using the same equipment now used to make lower quality multicrystalline silicon. It will be available early next year. Several other manufacturers are developing similar technology.

It's the second technology, which the company calls HiCz, that could have a bigger long-term impact. It cuts the cost of making a type of monocrystalline silicon that is leavened with trace amounts of phosphorous, which further boosts a panel's efficiency. This type of silicon is currently used in only 10 percent of solar panels because of its high cost, but could gain a bigger share of the market as a result of the cost savings (up to 40 percent) from GT's technology. The technology will be available next year.
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