期刊
METALS
卷 12, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/met12122090
关键词
laser-induced forward transfer (LIFT); grid lines; morphology; transfer mechanism; metallization
资金
- Research Project of Guangdong Aerospace Research Academy Research Project
- [GARA2022001000]
Laser-induced forward transfer (LIFT) is an innovative metallization technique used in the processing of solar cells. This study investigated the morphology and transfer mechanisms of formed lines with high-viscosity silver paste and small gap. Different transfer states and thresholds were observed under different laser fluences. The line width increased with higher laser fluence. The characteristics of the transferred silver paste varied depending on the laser fluence. This work provides insights for improving fine-line metallization and understanding transfer mechanisms in photovoltaic applications.
Laser-induced forward transfer (LIFT) is an innovative metallization technique used in the processing of grid lines of solar cells for the photovoltaics industry. A study on the morphology and transfer mechanisms of formed lines with high-viscosity silver paste and small gap was performed in this paper. There were three different transfer states under different laser fluences: non-transferred lines or transferred but no continuous lines, continuous transferred lines, and explosive transferred lines. There was a critical transfer threshold for the continuous line transfer under different processing speeds. Higher processing speed required a larger critical transfer threshold. The line width increased as the laser fluence increased. For all continuous formed lines, the cross-sectional morphologies with single and double peaks were shown at critical and above transfer threshold, respectively. Two symmetrical protrusions with steep edges were observed for the formed line with double peaks. By comparing the silver paste remaining on the donor and transferred to the acceptor under different laser fluences, it can be found the transferred silver paste exhibited a retracting characteristic under the critical and above transfer threshold. While a stretching characteristic was obvious when the laser fluence was much higher than the transfer threshold. Morphological characteristics with single or double peaks were determined by the distance between the rupture position of the bridge and the bottom of the bubble, under the action of the axial combined forces. This work can provide insights for improving fine-line metallization and understanding transfer mechanisms in the photovoltaic application and flexible electronics devices.
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