DEK Solar print process leads to 19.4% c-Si PV cell

The Institute for Solar Energy Research Hamelin (ISFH, Emmerthal, Germany) used DEK Solar’s PVP1200 print platform and specialized screens to acheive 19.4% crystalline silicon solar photovoltaic (PV) cell efficiency.

May 13, 2011 — The Institute for Solar Energy Research Hamelin (ISFH, Emmerthal, Germany) used DEK Solar’s PVP1200 print platform and specialized screens to acheive 19.4% crystalline silicon solar photovoltaic (PV) cell efficiency.

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Photo courtesy of ISFH.

The cell used a 200nm Si02/SiNx double layer on the rear side of a standard PV cell in combination with DEK’s novel front-side metallization process. DEK Solar’s PVP1200 print platform achieves six-sigma process capability at a resolution of ±12.5µm. Specialized DEK Solar screens enabled fired contact finger aspect ratios of 0.38 via the print-on-print process.

“The print-on-print process effectively increases contact finger height and reduces finger width, thus resulting in less shadowing loss and improved efficiency. Combined with our rear side cell modifications to increase the current and voltage of the cell, the DEK Solar technologies have helped facilitate this nearly 1% improvement over our previous 18.5% efficiency level,” said Dr. Thorsten Dullweber, ISFH group leader for solar cell production processes.

As stated by ISFH on March 8, 2011, this efficiency level is record-breaking among Cz-silicon solar cells using a screen printing metallization process. “DEK Solar’s print-on-print technology and PVP1200 platform accuracy were key contributors to this major efficiency gain,” explains Dullweber.

DEK provides modular metallization platforms, precision screens and materials applications used in back side field coating, current-collector pattern and termination deposition for photovoltaic substrate production. For more information, visit DEK Solar at www.deksolar.com.

Also read: IMEC presents large-area Si solar cells with high efficiency

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