Heraeus Introduces Versatile New Front Side Silver Paste for Silicon PV Cells

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Heraeus PV Materials has developed a new front-side silver paste that offers higher efficiencies along with superior contact quality and aspect ratios on both mono- and multi-crystalline wafers and a wide range of sheet resistance emitters used in photovoltaic cell manufacturing.

The chemistry of SOL9235H enhances the etching of the anti-reflective coating and significantly improves the contact quality of the cell during the spike firing process

The Photovoltaic Business Unit of Heraeus has developed a new front-side silver paste that offers higher efficiencies along with superior contact quality and aspect ratios on both mono- and multi-crystalline wafers and a wide range of sheet resistance emitters. The cadmium-free silver metallization paste (SOL9235H) is the newest in the series of Heraeus products introduced each year for the photovoltaic cell manufacturing market. Heraeus invests heavily in research and development to be able to produce new formulations each year that increase the efficiency of produced cells.

According to Andy London, Heraeus PV Business Unit manager, customers who tested this new front-side paste during the development and scale-up phase reported increases of cell absolute output efficiencies in the 0.2 to 0.4 percent range -- outperforming any other silver paste available on the market today.

"The chemistry of SOL9235H enhances the etching of the anti-reflective coating and significantly improves the contact quality of the cell during the spike firing process," said London. "The paste also provides a very high printed aspect ratio feature which further boosts current density and fill factor of the cell."

About Heraeus Photovoltaic Business Unit:
The Heraeus Photovoltaic Business Unit is part of the Thick Film Division of WC Heraeus, the precious metals and technology group with headquarters in Hanau Germany, a globally active, family-owned company with business areas that include precious metals, sensors, dental and medical products, quartz glass and specialty lighting sources. With a business volume of over €10 billion and more than 11,000 employees in over 100 companies worldwide, Heraeus has been an internationally recognized specialist in materials and precious metals for more than 150 years.

The WC Heraeus Thick Film Division (TFD) is a market leader in electronic materials like thick film pastes and materials for passive components and hybrid circuits, as well as advanced materials like LTCC materials and photoetchable pastes. Heraeus TFD has extensive expertise in the development, application and processing of thick film materials and provides global product manufacturing and regional support through applied technology labs. A diverse product offering has evolved over years of experience to now include metallization materials for silicon solar cells.

All Heraeus products are supported by in-depth process knowledge, personalized service, and custom solutions for emerging applications.

With multiple R&D sites and a global network of production and support facilities, Heraeus continually introduces new products that meet both local and global requirements. The company's goal is to achieve a level of quality and performance unsurpassed in the industry.

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