Silver Pastes for Dual Print Applications

Dual-printing for Ultra finger line (DP-ULF) is a technique many c-Si PV cell manufacturers support for improving cell efficiency. It enables to print very narrow line widths without compromising line quality by printing finger lines on top of each other.

With Heraeus you have a partner for silver pastes, that meets this technical challenge!

SOL6700B Series

New Generation Dual Printing Busbar Paste

Heraeus’ newly developed SOL6700B dual printing busbar paste helps to realize higher efficiency and lower manufacturing costs of solar cells. SOL6700B contains a specific glass chemistry, imparting controlled reaction between Ag paste and the dielectric layer. At the same time, because of separate printing of busbar and finger paste, it does not need to consider the height of the busbar area, and allow to do more optimization on screen, to reduce the usage of the silver paste. The SOL6700B is designed to maximize the protection of the dielectric layer of cells from damage during metallization thus contributing to reduce electron recombination and improving the open-circuit voltage. Especially matching with mainstream finger paste on the market at present, can further improve the efficiency when combined with UFL screen printing technology. SOL6700B series, moreover, can be compatible with a variety of mainstream cell technology at present, including Mono/ Multi PERC, Double Passivation, Double Passivation+SE, N-type, MCCE and so on.

KEY BENEFITS

  • Design for Dual Printing with low laydown
  • Less reactivity into the passivation SiNx and AlOx/SiNx
  • Excellent adhesion and wide soldering window
  • Reduce the manufacturing cost of silicon solar cells
  • Compatible with all kinds of mainstream cell technology
  • No Cd and Pb

SOL6600B Series

New Generation Dual Printing Busbar Paste

Heraeus’ newly developed SOL6600B dual printing busbar paste helps to realize its higher efficiency and lower manufacturing costs of solar cells. SOL6600B contains a specific glass chemistry, imparting controlled reaction between Ag paste and the dielectric layer. At the same time, on account of separate printing of busbar and finger paste, it does not need to consider the height of the busbar area, and allow to do more optimization on screen, to reduce the usage of the silver paste.

The SOL6600B is designed to maximize the protection of the dielectric layer of cells from damage during metallization thus contributing to reduce electron recombination and improving the open-circuit voltage. Especially matching with mainstream finger paste on

the market at present, can further improve the efficiency when combined with knot-less screen-printing technology. SOL6600B series, moreover, can be compatible with a variety of mainstream cell technology at present, including MCCE, DWC, mono PERC, and so on.

KEY BENEFITS

  • Higher efficiency
  • Less reactivity into the passivation SiNx and Al2O3/SiOx
  • Excellent adhesion and wide soldering window
  • Reduce the manufacturing cost of silicon solar cells
  • Compatible with all kinds of mainstream cell technology
  • No Cd and Pb*

SOL9661B Series

New Generation Front Side Silver Paste for PERC+SE

The Heraeus SOL9661B series front side silver paste was specially designed for ULDE (Ultra Lightly Doped Emitter) plus SE (Selective Emitter). SOL9661B series is based on the glass chemistry upgraded from the last generation to offer high adhesion and extra protection on laser damaged area, combined with the latest improvement in organic vehicle system for UFL(Ultra-Fine-Line) printing. As confirmed by customers, SOL9661B has efficiency gain > 0.05% in mass production.

SOL9661B has a wide firing window toward lower temperature side, which makes the series well-performed on PERC solar cells, meanwhile, superior UFL printing ability gives more space to customer to reduce laydown and improve efficiency. It is worth mentioning that the SOL9661B platform allows our R&D to offer solutions for different printing technology and emitter.

KEY BENEFITS

  • Ultra-Fine-line screen printing
  • Superior contact and Voc for SE PERC emitter
  • Low laydown and high adhesion
  • High Voc, extra protection on laser damaged Selective Emitter
  • Low firing temperature and wide contact window can further reduce LeTID
  • Perfect compatibility with multi Busbar printing
  • Allow quick and efficient customization

SOL9651B Series

New Generation Front Side Silver Paste

Heraeus, the technology leader, closely following the industry trend, has developed the SOL9651B series based on the paste chemistry upgraded from last generation for ULDE (Ultra Lightly Doped Emitter) with Selective Emitter (SE), combined with the latest improvement in organic vehicle system for UFL (Ultra-Fine-Line) printing. As confirmed by customers, SOL9651B has efficiency gain > 0.10 % in mass production.

SOL9651B is an evolutionary product family designed for advanced PERC (Passivated Emitter Rear Contact) technology. Such paste chemistry provides a wide firing window toward lower temperature side, which makes this series well-performed on PERC. It is worth mentioning that the 9651B formulation also allows our local PML (Product Modification Labs) to do quick and efficient customization for versatile customer applications.

KEY BENEFITS

  • High Voc, extra protection of laser damaged selective emitter area
  • High FF, superior contact performance to provide more space of diffusion optimization
  • Ultra-fine-line (UFL) screen printing for defect-free mass production
  • Wide process window
  • Great CTM (cell-to-module) performance
  • Allows quick and efficient customization
  • Double and Dual printing packages available
    • A+A’: SOL9652B1/SOL9652B2
    • A+B: SOL9651B/SOL9622B

SOL9661D Series

Front-side Silver Paste designed for DWC mc Cell

The Heraeus SOL9661D series front-side silver paste was specially designed for the Diamond-Wire-Cut (DWC) multi crystalline solar cells with specially textured surface. In addition to great cost reduction, SOL9661D can raise the conversion efficiency of DWC cells by > 0.05%.

The new glass chemistry was developed to provide excellent adhesion of SOL9661D, which allows customers to optimize their busbar design for better electrical performance and cost reduction, especially on DWC/ Black-silicon texturing. Meanwhile, the new organic vehicle system is developed to provide superior ultra-fine-line screen printing, which allows customers to further narrow finger width for better electrical performance and cost reduction. It is worth mentioning that the SOL9661D platform allows our R&D to offer solutions for different printing technology, especially for Knotless screen printing.

KEY BENEFITS

  • Ultra-Fine-Line printing can boost additional efficiency gain on DWC wafer
  • New glass can provide great adhesion on DWC/ Black-silicon cells
  • Balanced metallization in both contact and Voc to achieve great efficiency gain
  • Compatible for Single printing, Dual and Double printing
  • Allow quick and efficient customization

SOL9651D Series

Front-side silver paste designed for Diamond-Wire-Cut mc cell can raise the conversion efficiency by > 0.1%.

The Heraeus SOL9651D series front-side silver paste was specially designed for the emerging Diamond-Wire-Cut (DWC) multicrystaline solar cells with specially textured surface.

In order to optimize your busbar design for better electrical performance and cost reduction, a new glass chemistry was developed. It provides excellent adhesion, especially on DWC/Black-silicon texturing.

Your Benefit - Our strength

  • Superior value with better electrical performance and high busbar adhesion.
  • Compatible for both multi and mono crystalline wafers.
  • Reducing the negative impact of irradiation on the charge carrier lifetime by an outstanding Light Induced Degradation.

SOL9661B2 Series

New Generation Front Side Silver Paste for PERC

As different passivation technologies were matured in PERC process, such as PECVD (Plasma Enhanced Chemical Vapor Deposition) and ALD (Atomic Layer Deposition), the Alumina oxide and Silicon nitride layers are intentionally (double passivation) or unintentionally (wrap-deposition) stacked on the front-side of silicon solar cell. This has given FS paste more challenges.

Heraeus, the technology leader, closely following the industry trend, has developed the SOL9661B2 series based on the paste chemistry specially designed for stack passivation PERC cell. As confirmed by customers, SOL9661B2 single printing, dual printing and double printing packages provide efficiency gain > 0.10% in mass production. Such paste chemistry provides a wide firing window toward lower temperature side, which makes this series well-performed on PERC and SE-PERC cells.

KEY BENEFITS

  • Specially designed paste for “Double Passivation” PERC cell
  • High FF, Ultra-Fine-line printability for better efficiency
  • Single, Dual and Double printing package available for efficiency boost
  • Wide process window
  • Allows quick and efficient customization

SOL9651B2 Series

New Generation Front Side Silver Paste

As different passivation technologies were matured in PERC process, such as PECVD (Plasma Enhanced Chemical Vapor Deposition) and ALD (Atomic Layer Deposition), the Alumina oxide and Silicon nitride layers are intentionally (double passivation) or unintentionally (wrap-deposition) stacked on the front-side of silicon solar cell. This has given FS paste more challenges.

Heraeus, the technology leader, closely following the industry trend, has developed the SOL9651B2 series based on the paste chemistry specially designed for stack passivation PERC cell; As confirmed by customers, SOL9651B2 dual printing and double printing packages provide efficiency gain > 0.15 % in mass production. Such paste chemistry provides a wide firing window toward lower temperature side, which makes this series well performed on PERC cell.

KEY BENEFITS

  • High FF, superior contact performance on stack passivation solar cell
  • Ultra-fine-line (UFL) screen printing for defect-free mass production
  • Wide process window
  • Allows quick and efficient customization
  • Double and Dual printing packages available
    • A+A’: SOL9652B packages
    • A+B : SOL9651B2/SOL9622B

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