Abstract
Attempts to improve the application performance of noncontact silver (Ag) screen-printing paste for crystalline silicon solar cells, especially in terms of solderability, depend heavily on controlling the properties of the glass additive therein. Taking PbO–B2O3–SiO2–RxOy glasses as an example, this work demonstrates an improvement in the Ag paste due to the RxOy (e.g., ZnO, Bi2O3, Al2O3, and MgO) component. The RxOy components were found to help improve the sintering compactness of the Ag paste. The inclusion of the different RxOy components resulted in obvious differences in the soldering state of the sintered Ag grid. Microscopic observations revealed that the soldering state was related to the covering of the solder on the Ag grid and the growth rate of the intermetallic compound Ag3Sn during soldering. Comparatively, the sintered Ag grid was soldered more firmly when the glass containing the Bi2O3 or Al2O3 component was used in the Ag paste. This is due to the higher coverage of solder on these Ag grids and the appropriate growth rate of Ag3Sn. Considering these findings, the functions of the RxOy components are discussed comprehensively.
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This study was supported by the National Key Research and Development Project (No. 2018YFB1500301).
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Li, H., Tong, H., Zhang, J. et al. Investigation on PbO–B2O3–SiO2–RxOy Glasses Applied in Noncontact Silver Paste for Crystalline Silicon Solar Cells. J. Electron. Mater. 49, 5422–5429 (2020). https://doi.org/10.1007/s11664-020-08281-w
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DOI: https://doi.org/10.1007/s11664-020-08281-w