Title:
Investigation of Modified Screen-Printing Al Pastes For Local Back Surface Field Formation
Investigation of Modified Screen-Printing Al Pastes For Local Back Surface Field Formation
Author(s)
Meemongkolkiat, Vichai
Nakayashiki, Kenta
Kim, Dong Seop
Kim, Steve
Shaikh, Aziz
Kuebelbeck, Armin
Stockum, Werner
Rohatgi, Ajeet
Nakayashiki, Kenta
Kim, Dong Seop
Kim, Steve
Shaikh, Aziz
Kuebelbeck, Armin
Stockum, Werner
Rohatgi, Ajeet
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Abstract
This paper reports on a low-cost screen-printing process to form a self-aligned local back surface field (LBSF) through dielectric rear surface passivation. The process involved formation of local openings through a dielectric (SiNx or stacked SiO(2)/SiN(x)) prior to full area Al screenprinting and a rapid firing. Conventional Al paste with glass frit degraded the SiN(x) surface passivation quality because of glass frit induced pinholes and etching of SiN(x) layer, and led to very thin LBSF regions. The same process with a fritless Al paste maintained the passivation quality of the SiN(x), but did not provide an acceptably thick and uniform LBSF. Al pastes containing appropriate additives gave better LBSF because of the formation of a thicker and more uniform Al-BSF region. However, they
exhibited somewhat lower internal back surface reflectance (<90%) compared to conventional Al paste on SiN(x). More insight on these competing effects is provided by fabrication and analysis of complete solar cells.
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Date Issued
2006-05
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Proceedings