Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Laser printing and curing/sintering of silver paste lines for solar cell metallization
Áreas de investigación
  • Fisica pl -- plasmas and fluidos,
  • Ingenierías,
  • Ingenieria mecanica
The main objective of this work is to adapt the Laser Induced Forward Transfer (LIFT), a well-known laser direct writing technique for material transfer, to define metallic contacts (fingers and busbars) onto c-Si cells and to use continuous wave laser sources to curing and sintering the deposited line. Commercial silver pastes (with viscosity around 30-50 kcPs) are applied over a donor glass substrate using a coater with a controlled thickness in the range of tens of microns. A solid state pulsed laser (532 nm) is focused at the glass/silver interface producing a droplet of silver that it is transferred to an acceptor substrate. Lines are drawn by means of scanning the laser spot. The influence of the process parameters (silver paste thickness, gap between donor and acceptor, and laser parameters - spot size, pulse energy and overlapping of pulses) is studied as a function of the morphology of the deposited lines using confocal and scanning electron microscopy. With an appropriate process parameterization it is possible to transfer a high paste volume per pulse (? 400 pL) and then large aspect ratio lines (? 0.5) can be drawn at high speeds (2 m/s). After the printing process a continuous wave green laser is used to heat the silver paste line to remove the organic layer (curing) or even to produce some melting between the silver grains (sintering) in order to reduce the line resistance. Process parameters such as laser power, spot size, processing velocity, and number of scans are studied. Results show that all-laser based metallization processes are possible.
Nombre congreso
Lasers in Manufacturing Conference 2015
Tipo de participación
Lugar del congreso
Munich (Alemania)
Fecha inicio congreso
Fecha fin congreso
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Título de las actas
Lasers in Manufacturing Proceedings 2015 http://www.wlt.de/lim/
Esta actividad pertenece a memorias de investigación
  • Autor: David Muñoz Martin (UPM)
  • Autor: Yu Chen . (UPM)
  • Autor: Andrés Márquez (UPM)
  • Autor: Miguel Morales Furio (UPM)
  • 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 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)