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Memorias de investigación
Ponencias en congresos:
Characterization of transfer regimes of high-viscosity silver pastes printed by LIFT
Áreas de investigación
  • Física,
  • Fisica pl -- plasmas and fluidos,
  • Ingenierías,
  • Ingenieria mecanica
Laser induced forward transfer (LIFT) technique has been previously used for printing metallic contacts onto flexible optoelectronics devices, patterning solder paste for microelectronics or for the metallization of the front side of solar cells. In the latter case, LIFT is capable of making better contacts by improving their aspect ratio while reducing the amount of silver paste wasted. The mechanisms for material transfer using LIFT have been widely discussed in the case of solid and Newtonian fluids. However, the particular rheology and very large viscosity of silver pastes used for metallization of solar cells has led the particular mechanisms and printing results obtained to remain unclear. In this work, a study of LIFT of single dots of a high viscosity silver paste was performed using ns-pulsed lasers. Phenomenological and analytical descriptions are given of the influence of process parameters on the morphology of transferred paste dots characterized by means of confocal microscopy and time-resolved imaging. Four transfer regimes are defined in accordance with the observed distinctive paste dot morphologies on the acceptor: non-dot transfer, in which the pulse energy is below the transfer threshold of a given paste thickness; cluster-dot transfer, where the dot size increases as a function of pulse energy for relatively thin films of paste; concrete-dot transfer, when the paste is thick enough to allow the protruding jet to impact the acceptor substrate without separating from the donor substrate; and explosion-dot transfer, where the high laser pulse energy generates a bursting ejection on the donor that splashes paste on the acceptor.
Nombre congreso
Photonics West 2016
Tipo de participación
Lugar del congreso
San Francisco, Estados Unidos
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Título de las actas
No se publica en actas ya que se ha publicado previamente el artículo Applied Surface Science
Esta actividad pertenece a memorias de investigación
  • Autor: David Muñoz Martin (UPM)
  • : F Brasz (Princeton University)
  • Autor: Yu Chen (UPM)
  • Autor: Miguel Morales Furio (UPM)
  • Autor: C. B. Arnold (Princeton University)
  • Autor: Carlos Luis Molpeceres Alvarez (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Manufactura Avanzada con Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada e Ingeniería de Materiales
S2i 2022 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
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