Effects of firing ambient on rear metallization for silicon solar cells

Sungeun Park, Young Do Kim, Hyomin Park, Yoon Mook Kang, Haeseok Lee, Donghwan Kim

Research output: Contribution to journalArticle

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 N2, O2, 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.

Original languageEnglish
Pages (from-to)336-340
Number of pages5
JournalKorean Journal of Materials Research
Volume25
Issue number7
DOIs
Publication statusPublished - 2015

Keywords

  • Al rear metallization
  • Back surface field
  • Back surface recombination velocity
  • Crystalline silicon solar cells
  • Firing process

ASJC Scopus subject areas

  • Materials Science(all)

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