Schott Solar AG recorded 20.2% efficiency with a 156mm2 mono-crystalline silicon solar cell, verified independently by Fraunhofer ISE Institute of Freiburg. Schott Solar used Schmid Group production engineering to fab the photovoltaic cell.
August 26, 2011 — Schott Solar AG recorded 20.2% efficiency with its mono-crystalline silicon solar cells in the industrial 156mm2 format, verified independently by Fraunhofer ISE Institute of Freiburg. Schott Solar used Schmid Group production engineering to fab the photovoltaic cell.
The cell utilizes an optimized front and rear cell surface design. The frontside was designed and processed in Schmid’s Technology Center in Freudenstadt, Germany. Alkaline texturing in the horizontal in-line process, formation of the p-n junction, and selective emitter (SE) technology were optimized for increased solar cell efficiency. Final processing with passivated emitter and rear cell (PERC) structures was carried out by Schott Solar in Alzenau.
Also read: Sunrise, Schmid push 19.2% efficient cell, eye mass output
Combining in-line process for alkaline wafer texturing with a well-established SE production process resulted in virtually perfect performance of the cell’s front surface. Schott credits the steps’ wide process windows and production stability for high-quality cells.
“Further technological improvement of the front-side metallization will, in the near future, achieve a cell efficiency of 20.5%,” asserted Dr. Christian Buchner, Vice President of Business Unit Cell with the Schmid Group. Buchner also expects process improvements to reduce the silver content required for the emitter electrode, which will drop the process cost.
The new efficiency record of 20.2% is 0.6% higher than the previous value and more than 2% higher than that of conventional solar cells which, in mass production, achieve an efficiency of some 18%.
Schmid Group makes equipment for solar photovoltaic, printed circuit board, and display manufacturing. Learn more at http://www.schmid-group.com/en/home.html (English language version).