Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Laser printing and curing/sintering of silver paste lines for solar cell metallization
Year:2015
Research Areas
  • Physics - Plasma and fluid,
  • Engineering,
  • Mechanical engineering
Information
Abstract
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.
International
Si
Congress
Lasers in Manufacturing Conference 2015
960
Place
Munich (Alemania)
Reviewers
Si
ISBN/ISSN
CDP08UPM
Start Date
22/06/2015
End Date
25/06/2015
From page
1
To page
7
Lasers in Manufacturing Proceedings 2015 http://www.wlt.de/lim/
Participants
  • Autor: David Muñoz Martin (UPM)
  • Autor: Yu Chen . (UPM)
  • Autor: Andrés Márquez (UPM)
  • Autor: Miguel Morales Furio (UPM)
  • Autor: Carlos Luis Molpeceres Alvarez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Manufactura Avanzada con Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada e Ingeniería de Materiales
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