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Fine Line Screen Printing of Thick Film Pastes on Silicon Solar Cells
Keywords: screen printing, aspect raito, solar cell
Fine line screen printing capabilities are essential as photovoltaic technology for crystalline silicon solar cells progresses. One approach to increasing efficiency is a movement towards higher sheet resistance emitters. This will improve both current and voltage in the solar cell by increasing the blue response and decreasing recombination. The grid design for the front contact metallization must be adjusted to realize these benefits of increasingly higher sheet resistances. Finger lines must be narrower and spaced closer together to account for the increased sheet resistance between traces while decreasing shadowing of the cell. They must also be taller to maintain a cross sectional area that will transport current with low line resistance. The combination of these printing properties is known as high aspect ratio. This paper presents the challenges of fine line screen printing of thick film pastes with high aspect ratio for solar cell applications. We will discuss the print quality as it pertains to the interactions between paste rheology, screen printing parameters, and screen technology.
Dean Buzby, Technical Service Engineer
Heraeus, Inc.
West Conshohocken, PA

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