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http://dx.doi.org/10.3740/MRSK.2015.25.7.336

Effects of Firing Ambient on Rear Metallization for Silicon Solar Cells  

Park, Sungeun (Department of Materials Science and Engineering, Korea University)
Kim, Young Do (Department of Materials Science and Engineering, Korea University)
Park, Hyomin (Department of Materials Science and Engineering, Korea University)
Kang, Yoonmook (KU.KIST Green School, Graduated school of Energy and Environment, Korea University)
Lee, Hae-Seok (Department of Materials Science and Engineering, Korea University)
Kim, Donghwan (Department of Materials Science and Engineering, Korea University)
Publication Information
Korean Journal of Materials Research / v.25, no.7, 2015 , pp. 336-340 More about this Journal
Abstract
For rear metallization with Al paste, Al back contacts require good passivation, high reflectance, and a processing temperature window compatible with the front metal. In this paper, the effect of the firing ambient during the metallization process on the formation of Al rear metal was investigated. We chose three different gases as ambient gases during the firing process. Using SEM, we observed the formation of a back surface field in $N_2$, $O_2$, and Air ambients. To determine the effect of the ambient on Voc, the suns-Voc tool was used. In this study, we described the mechanism of burn-out of organic materials in Al paste during the firing process. The oxygen ambient plays an important role in the burn-out process. We calculated the efficiency with obtained the back surface recombination velocities using PC1D simulation. It was found that the presence of oxygen during the firing process influenced the uniform back surface field because the organic materials in the Al paste were efficiently burned out during heating. The optimized temperature with oxygen flow shows an absolute efficiency of 19.1% at PC1D simulation.
Keywords
crystalline silicon solar cells; Al rear metallization; Back surface field; Firing process; Back surface recombination velocity;
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Times Cited By KSCI : 1  (Citation Analysis)
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