RASIRC Steamer Used in Fraunhofer ISE'S MWT-PERC Solar Cell Manufacturing Process
Steamer helps achieve 20.2% efficiency in manufacture of back-contact silicon solar cells / IEEE Photovoltaic Specialist Conference 2011, Booth 316
The RASIRC Steamer removes volatiles, ionic contaminants, and other impurities from steam generated from DI water so the steam can be used for critical solar cell manufacturing processes. Yield is increased because metals, hydrocarbons, and particles are rejected by the non-porous membrane to deliver steam with purity in the parts per trillion (ppt). Throughput is increased with continuous unattended 24/7 operation. Compared to pyrolytic torches, there is no thermal build-up with increased flow rate, it's safer as hydrogen and oxygen are eliminated from the oxidation process, it operates at significantly lower temperature, and handles a wide range of pressures and flow rates.
Fraunhofer applies both MWT and PERC processes for increasing efficiency in its solar cells. In the MWT concept, the external front-contacts are transferred to the backside of the solar cell. As a result, more sunlight is incident on the front surface and the solar cell efficiency increases. In the PERC concept, both the optimized reflection of the solar cell backside as well as passivation of the rear surface contribute to higher efficiencies. The screen-printed aluminum back-contact is connected to the p-type silicon material using local laser alloying -- the so-called Laser Fired Contact (LFC) process.
"It has been a very productive and positive experience working with the engineers from Fraunhofer ISE," said Jeffrey Spiegelman, president of RASIRC. "It is very exciting to be an important part in bringing MWT/PERC cells to mass production."
Learn more about RASIRC products at the 37th IEEE Photovoltaic Specialist Conference, Seattle, WA, June 19-24, 2011, Booth 316.
RASIRC products purify and deliver ultra-pure liquids and gases. RASIRC technology is the first to generate ultra-high-purity (UHP) steam from de-ionized water. It reduces cost, increases yield, and improves safety. RASIRC dryers, humidifiers, and steam generators are of critical importance for many applications in the semiconductor, pharmaceutical, medical, biological, fuel cell, and power industries. Custom systems are available upon request. Call +1-858-259-1220, e-mail email@example.com, or visit www.rasirc.com.