Effects of fine particle content in al paste on screen printed contact formation and solar cell performance

Hsin Chiao Fang, Chuan Pu Liu, Hung Shuo Chung, Chin Lin Huang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Al screen printed Si solar cells are fabricated in a belt system, and the impact of the fine Al particle content in the Al paste on the alloying process in relation to solar cell performance is investigated. Scanning electron microscopy and transmission electron microscopy analyses show that a lack of fine Al particles in the Al paste causes nonuniform back surface field (BSF), Al-rich extrusions at the Al-Si alloy/Si interface with faceting along the {111} planes of Al, and unmelted Si-rich rods in the Al-Si alloy layer after alloying results in lower Voc, Jsc, and fill factor. The quality of the BSF and the Al-Si alloy layer could thus be improved by optimizing the fine Al particle content in the Al paste. Of the four pastes with different fine Al particle contents prepared for comparison, the content of 27 wt % renders the best contact quality, whereas an even higher content would cause a finer-grained polycrystalline Al-Si alloy to form and the fired Al layer to peel off from the Al-Si alloy layer.

Original languageEnglish
Pages (from-to)H455-H458
JournalJournal of the Electrochemical Society
Volume157
Issue number4
DOIs
Publication statusPublished - 2010 Mar 26

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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