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 language | English |
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Pages (from-to) | 1333-1338 |
Number of pages | 6 |
Journal | Metals and Materials International |
Volume | 19 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2013 Nov |
Bibliographical note
Funding Information:This work was supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20104010100640). This work was also supported by the WC-300 of the Korea Evaluation Institute of Industrial Technology (KEIT) grant funded by the Korea government Ministry of Knowledge Economy (No. 10043264).
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