Silver Pastes for N-Type Cells

The share of N-type silicon solar cells is expected to further increase in the coming years as wafer costs go down and the inherent higher quality silicon allows to achieve higher overall conversion efficiencies.

SOL9380 Series

New Generation N-type Front Side Paste

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

SOL9370 Series

New Generation N-type Front Side Paste

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

SOL7200 Series

New Generation Silver Paste for TOPCon

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

SOL7100 Series

New Generation Silver Paste for TOPCon

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

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