Numerical study of paste-bridge transfer process for laser induced high-viscosity silver paste

[Display omitted] Laser-induced forward transfer (LIFT) is promising for solar-cell metallization and electronic printing due to its low dependence on paste viscosity and nozzle-free process. In this paper, the transfer process and morphological characteristics for LIFT of high-viscosity silver past...

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Bibliographic Details
Published in:Optics and laser technology 2025-04, Vol.182, Article 112221
Main Authors: Zhang, Yanmei, Li, Shaoxia, Tian, Chongxin, Yu, Yucui, Pan, Sining, He, Xiuli, Yu, Gang
Format: Article
Language:English
Subjects:
Deposition morphology
High-viscosity paste
Internal pressure
Laser-induced forward transfer (LIFT)
Transfer dynamics
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Summary:[Display omitted] Laser-induced forward transfer (LIFT) is promising for solar-cell metallization and electronic printing due to its low dependence on paste viscosity and nozzle-free process. In this paper, the transfer process and morphological characteristics for LIFT of high-viscosity silver paste were studied through simulations and experiments. The shear-thinning rheological properties were considered using the fitted Carreau model. Variations of paste protrusion with single pulse energy and time were obtained from the high-speed imaging. The evolution of initial pressure that induces the paste protrusion was solved inversely and quantitatively expressed by a polynomial function. The internal pressure should be sufficiently larger than 40 MPa to induce the effective transfer. In the simulation, the induced bubble undergoes a non-spherical transition from mushroom to pea-pod and capsule shapes due to constraints from surrounding paste and substrate. The deposition morphology formed by the induced mushroom-shaped bubble shows high printing precision with thin width (
ISSN:0030-3992
DOI:10.1016/j.optlastec.2024.112221