Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Influence of Laser Wavelength on Laser-Fired Contacts for Crystalline Silicon Solar Cells
Year:2012
Research Areas
  • Engineering
Information
Abstract
In the Laser-Fired Contact (LFC) process, a laser beam fires a metallic layer through a dielectric passivating layer into the silicon wafer to form an electrical contact with the silicon bulk [1]. This laser technique is an interesting alternative for the fabrication of both laboratory and industrial scale high efficiency passivated emitter and rear cell (PERC). One of the principal characteristics of this promising technique is the capability to reduce the recombination losses at the rear surface in crystalline silicon solar cells. Therefore, it is crucial to optimize LFC because this process is one of the most promising concepts to produce rear side point contacts at process speeds compatible with the final industrial application. In that sense, this work investigates the optimization of LFC processing to improve the back contact in silicon solar cells using fully commercial solid state lasers with pulse width in the ns range, thus studying the influence of the wavelength using the three first harmonics (corresponding to wavelengths of 1064 nm, 532 nm and 355 nm). Previous studies of our group focused their attention in other processing parameters as laser fluence, number of pulses, passivating material [2, 3] thickness of the rear metallic contact [4], etc. In addition, the present work completes the parametric optimization by assessing the influence of the laser wavelength on the contact property. In particular we report results on the morphology and electrical behaviour of samples specifically designed to assess the quality of the process. In order to study the influence of the laser wavelength on the contact feature we used as figure of merit the specific contact resistance. In all processes the best results have been obtained using green (532 nm) and UV (355 nm), with excellent values for this magnitude far below 1 m?cm2.
International
Si
Congress
27th European Photovoltaic Solar Energy Conference and Exhibition
960
Place
Frankfurt (Alemania)
Reviewers
Si
ISBN/ISSN
3-936338-28-0
Start Date
24/09/2012
End Date
28/09/2012
From page
1688
To page
1691
27th European Photovoltaic Solar Energy Conference and Exhibition Proceedings of the international Conference held in Frankfurt, Germany 24 - 28 September 2012
Participants
  • Autor: Maria Isabel Sanchez Aniorte (UPM)
  • Autor: D. Munoz-Martin (UPM)
  • Autor: Miguel Morales Furio (UPM)
  • Autor: P. Ortega (UPC)
  • Autor: I. Martín (UPC)
  • Autor: M. Colina (UPC)
  • Autor: R. Alcubilla (UPC)
  • Autor: Carlos Luis Molpeceres Alvarez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Investigación en Ingeniería y Aplicaciones del Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada a la Ingeniería Industrial
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