German based Heraeus Photovoltaics and Rietech Solar, a China-based manufacturer of silicon wafers for solar cells, signed a cooperation agreement to produce next-generation of multi-crystalline wafers. Under the agreement, Rietech Solar will upgrade its manufacturing process to use a coating from Heraeus called »HeraGlaze«. By increasing the usable section of the silicon ingot, »Heraeus will be able to increase Rietech’s wafer output yield by 3 percent and its customers’ cell efficiency by 0.05 percent,« says the company.
Developed in 2017, HeraGlaze is used in the very first step of the solar cell manufacturing process, when poly-crystalline silicon blocks are melted into a single silicon ingot. HeraGlaze is applied as a slurry on the porous surface of the crucibles, »acts as a barrier and prevents thermally-induced impurities, such as iron, from transferring from the crucible to the silicon ingot during the melting and crystallization of silicon.« By increasing the usable section of the silicon ingot, Heraeus will be able to increase Rietech’s wafer output and its customers’ cell efficiency.
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