Silver Pastes for N-Type Cells

As the P-type cell is getting closer to its efficiency limit, PV industry generally turns its attention to the N-type cell with higher efficiency potential. In recent years, the N-type cell has demonstrated its advantages over the P-type cell in efficiency in many fields, especially in the N-type TOPCon (Tunnel Oxide Passivated Contact) cell.

Heraeus has supported this effort for over five years with the development and mass production of our SOL9350, SOL9360, SOL9370 and SOL9380 series pastes. Heraeus continues to innovate through investments in R&D and has developed pastes with greater performance for N-type cells.

The Heraeus SOL9390 is our newest N-type paste for p+ emitter surfaces. In conjunction with our pastes for n+ emitter surfaces, beta test customers have demonstrated higher cell efficiencies with better contact to the cell’s boron emitter.

KEY BENEFITS

• Better contact resistivity for high Rsheet
• low metal induced recombination leading to higher VOC
• Improved printability / line uniformity
• Co-fireable with Heraeus n+ surface paste
• Wider firing window
• Higher green strength
• Compatible with Double and Dual printing

As N-type cells have drawn much attention as another ption for high efficiency c-Si solar cell. Those designs have demonstrated high efficiencies for cell manufactures and Heraeus is supporting those efforts since over four years with the development and mass production of SOL9350, SOL9360 and SOL9370 series pastes. Heraeus continues to invest into R&D and has developed pastes with greater performance for N-type cells.

The Heraeus SOL9380 is our newest N-type paste for p+wafer surfaces. In conjunction with our pastes for n+ wafer surfaces, beta test customers have demonstrated higher cell efficiencies with better contact to the cell’s boron emitter.

Please contact our local technical service teams for detailed progress recommendations.

KEY BENEFITS

• Customer confirmed > +0.1 % efficiency gain
• Higher Voc potential
• Improved printability / line uniformity
• Finer line resolution
• Co-fireable with Heraeus n+-surface paste
• A+B mode double printing packages (SOL9380/SOL9622B) available
• Better contact resistivity
• Large firing window

As N-type cell has drawn much attention as another avenue to high efficiency c-Si solar cell, designs have demonstrated high efficiencies for cell manufactures and Heraeus has supported this effort for over three years with the development and mass production of our SOL9350 and SOL9360 series pastes. Heraeus continues to innovate through investments in R&D and has developed pastes with greater performance for n-type cells.

The Heraeus SOL9370 is our newest n-type paste for p+ wafer surfaces. In conjunction with our pastes for n+ wafer surfaces, beta test customers have demonstrated higher cell efficiencies with better contact to the cell’s boron emitter.

KEY BENEFITS

• Customer confirmed > +0.1% efficiency gain
• Improved printability / line uniformity
• Finer line resolution
• Co-fireable with Heraeus n+-surface paste
• A+ B mode double printing packages (SOL9370/SOL9622B) available
• Better contact resistivity
• Large firing window

The SOL7200 paste has been developed based on our brand-new glass chemistry, combined with the latest breakthrough in organic vehicle system for fire through contact of TOPCon layers. SOL7200 enables lower firing temperatures to reduce the impact of metal induced recombination and maintain high cell Voc while also providing excellent contact resistance. SOL7200 has a wide firing window, and can be fired at low temperatures, which makes the paste especially suitable for the application on TOPCon (Tunnel Oxide Passivated Contact) solar cells. The paste is also specifically designed for the rear side of the solar cell with the advantage of high green strength and is compatible

with Heraeus SOL9370 and SOL9380 n-type front side pastes.

Please contact our local technical service teams for detailed progress recommendations.

KEY BENEFITS

• Specifically designed for N-type cells with TOPCon on rear
• Fire through paste for high temperature passivated contact
• Very low metal induced recombination leading to higher Voc
• Wide process window
• Lower firing temperature
• Suitable for rear side of solar cells

The SOL7100 paste has been developed based on our brand-new glass chemistry, combined with the latest breakthrough in organic vehicle system for fire through contact of TOPCon layers. SOL7100 enables lower firing temperatures to reduce the impact of metal induced recombination and maintain high cell Voc while also providing excellent contact resistance.

SOL7100 has a wide firing window, up to 100° C and can be fired at low temperatures, which makes the paste especially suitable for the application on TOPCon (Tunnel Oxide Passivated Contact) solar cells. The paste is also specifically designed for the rear side of the solar cell with the advantage of lower material usage.

KEY BENEFITS

• For outstanding efficiency gain
• Optimized material usage
• Wide process window
• Lower firing temperature
• Reduced metal induced recombination
• Suitable for rear side of solar cells

As the P-type cell is getting closer to its efficiency limit, PV industry generally turns its attention to the N-type cell with higher efficiency potential. In recent years, the N-type cell has demonstrated its advantages over the P-type cell in efficiency in many fields, especially in the N-type TOPCon(Tunnel Oxide Passivated Contact) cell. Heraeus has supported this effort for many years and continues to innovate through investments in R&D and has developed pastes with greater performance for N-type TOPCon cells.

The Heraeus SOL7300 is our newest paste for N-type TOPCon backside. The SOL7300 series paste has been developed based on our brand-new glass chemistry, combined with the latest breakthrough in organic vehicle system for fire through contact of TOPCon layers. SOL7300 enables lower firing temperatures to reduce the impact of metal induced recombination and maintain high cell Voc while also providing excellent contact resistance.

KEY BENEFITS

• Specifically Designed for N-type cells with TOPCon on rear
• Excellent contact resistivity is achieved even when fired at lower temperatures
• Very low metal induced recombination leading to higher VOC
• Support ultra-thin poly layer
• Higher green strength
• Lower firing temperature