Roth & Rau heterojunction solar cell reaches 21% efficiency

Roth & Rau AG achieved an efficiency rate of 21% with its high-efficiency heterojunction technology solar cells. The 156mm2 solar cells combine 20% output efficiency rates with a low temperature coefficient that enables a higher energy yield.

December 6, 2011 — Roth & Rau AG achieved an efficiency rate of 21% with its high-efficiency heterojunction technology (HJT) solar cells. The 156mm2 solar cells combine high, 20%, output efficiency rates with a low temperature coefficient that enables a higher energy yield.

Roth & Rau AG calculate that HJT reduces solar electricity generation costs by around 15% compared with traditional crystalline-silicon (c-Si) solar cells.

In September, Roth & Rau presented 156mm2 mono-crystalline-wafer heterojunction solar cells with 20% efficiency. These cell results have since been verified by the Fraunhofer Institute for Solar Energy Systems (ISE) and further progress has been made at Roth & Rau’s research line in Neuchâtel in close cooperation with the EPFL/IMT research institute located there.

At its Technology Centre in Hohenstein-Ernstthal, Roth & Rau is planning to transfer the results of the cell technology development work in Neuchâtel to mass production systems, using the HELiA coating systems, commented Dr. Egbert Vetter, VP for R&D at Roth & Rau AG, expecting mass production soon.

Roth & Rau AG provides production equipment and innovative production technologies for the photovoltaics industry. Learn more at http://www.roth-rau.de/.

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