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Bismuth Borosilicate-Based Thick Film Passivation of Ag Grid for Large-Area Dye-Sensitized Solar Cells

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A bismuth borosilicate glass-based thick film having a low glass transition temperature of 445°C was investigated as a passivation layer for protecting Ag-grid against corrosive reactions with the common I/I3 electrolyte for large area dye-sensitized solar cells (DSSC). Glass paste was carefully screen-printed and then fired in the temperature range of 480°–540°C to have a final thickness of ∼4 m. The effectiveness of the glass passivation film was related to the degree of densification or porosity, which depended on firing temperature of the glass. A high optical transmittance of ∼70% and the chemical inertness of the well-densified glass film can be highlighted as promising characteristics for this passivation application. The low electrical resistance of ∼27 Ω of the fluorine-doped tin oxide-coated substrate, which was obtained by patterning Ag grid, remained stable over the exposure period of ∼10 days in the electrolyte only when the hermetic protection of Ag was secured by the glass overcoat film after densification at 540°C.
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Document Type: Research Article

Affiliations: 1: Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea 2: Materials Science and Technology Division, Korea Institute of Science and Technology, Seoul 136-791, Korea

Publication date: 2010-06-01

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