Improvement of electrical properties in screen-printed crystalline silicon solar cells by contact treatment of the grid edge

Seongtak Kim, Sungeun Park, Young Do Kim, Hyunpil Boo, Hyunho Kim, Soohyun Bae, Hyomin Park, Sung Ju Tark, Donghwan Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In this study, the influence of HF treatment of Ag pastes after a firing process was investigated. It was shown that the HF treatment can improve the fill factors and efficiencies of various cells including those with high initial specific contact resistances. SEM images showed that this improvement is due to the etching of the thin glass layer at the Ag-Si boundary, which exposes the Ag crystallites and colloids. These colloids electrically connect the bulk Ag to the Si through a direct contact, which reduces both the transfer length and the specific contact resistance. A model of the current path was proposed to explain the effect of HF treatment on the edge of the Ag grid.

Original languageEnglish
Pages (from-to)1333-1338
Number of pages6
JournalMetals and Materials International
Volume19
Issue number6
DOIs
Publication statusPublished - 2013 Nov

Keywords

  • Ag paste
  • HF treatment
  • Si solar cells
  • electrical properties
  • scanning electron microscopy
  • screen-printing

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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