Influence of oxygen on Ag ionization in molten lead borosilicate glass during screen-printed Ag contact formation for Si solar cells
- Authors
- Chung, Bo-Mook; Cho, Sung-Bin; Chun, Jung-Woo; Kim, Young-Sik; Okamoto, Kuninori; Huh, Joo-Youl
- Issue Date
- 1-9월-2013
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Crystalline Si solar cell; Screen-printed Ag contact; Lead borosilicate glass; Ag ionization; Firing ambience
- Citation
- ELECTROCHIMICA ACTA, v.106, pp.333 - 341
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 106
- Start Page
- 333
- End Page
- 341
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/102188
- DOI
- 10.1016/j.electacta.2013.05.109
- ISSN
- 0013-4686
- Abstract
- In order to gain further insight into the formation mechanism of fire-through Ag contacts of Si solar cells, the ionization of Ag during the dissolution of Ag powder into a lead borosilicate glass melt was electrochemically investigated at 800 degrees C under various ambient conditions with different oxygen partial pressures (P-O2). Voltammetric analyses of the Ag-free and Ag-containing glass melts confirmed that some of the Ag powder dissolved into the molten glass as Ag+ ions through interaction of the powder with oxygen in the ambient atmosphere. The concentration of Ag+ in the molten glass significantly increased with increasing P-O2. The dependence of the Ag+ solubility in the molten glass on P-O2 was estimated from chronoamperometric measurements for a series of glass melts containing different amounts of Ag powder. The chronoamperometry results clearly demonstrated that the solubility limit of Ag+ in the molten glass at 800 degrees C also increased significantly with increasing P-O2. The present results strongly support the mechanism proposed recently for fire-through Ag contact formation in which Ag+ ions dissolved in the molten glass play a crucial role. The present study also suggests that the reaction kinetics during the fire-through Ag contact formation is effectively controlled by adjusting P-O2 in the ambient firing conditions as well as by modifying the glass chemistry to alter the solubility of Ag+ ions. (c) 2013 Elsevier Ltd. All rights reserved.
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