ISFH announces 21.2% efficiency for PERC solar cell

German Institute for Solar Energy Research Hamelin (ISFH) announced that it has achieved a 21.2% efficiency for an industrial PERC silicon solar cell with improved screen-printed contacts. According to the company, the result has been confirmed by German research center Fraunhofer Institute for Solar Energy Systems ISE. ISFH said the result was made possible by adopting an advanced five busbar design and a dual print process, that have reduced the contact finger width to 46 �m and the shadowing loss.
The head of the ISFH research group Solar Cell Production Processes, Thorsten Dullweber, said that the result was achieved within the research project HighScreen funded by the German Federal Ministry of the Environment in collaboration with the project partners SolarWorld AG, Heraeus Precious Metals GmbH & Co. KG, Rena GmbH, and Singulus Technologies AG.
In November, Belgian nanoelectronics research institute Imec announced that it achieved a 20.2% conversion efficiency for an i-PERC-type silicon solar cell using a new process. The solar cell adopted a new processing sequence based on laser doping from a thin atomic layer deposited (ALD) aluminum oxide (Al2O3) layer.

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