Influence of laser wavelength on Laser-Fired contacts for crystalline silicon solar cells

Sanchez Aniorte, Maria Isabel and Muñoz Martín, David and Morales Furió, Miguel and Ortega, Pablo and Martín, Isidro and Colina Brito, Mónica and Alcubilla, R. and Molpeceres Álvarez, Carlos Luis (2012). Influence of laser wavelength on Laser-Fired contacts for crystalline silicon solar cells. In: "27th EU PVSEC 2012", 24/09/2012 - 28/09/2012, Frankfurt, Alemania.

Description

Title: Influence of laser wavelength on Laser-Fired contacts for crystalline silicon solar cells
Author/s:
  • Sanchez Aniorte, Maria Isabel
  • Muñoz Martín, David
  • Morales Furió, Miguel
  • Ortega, Pablo
  • Martín, Isidro
  • Colina Brito, Mónica
  • Alcubilla, R.
  • Molpeceres Álvarez, Carlos Luis
Item Type: Presentation at Congress or Conference (Article)
Event Title: 27th EU PVSEC 2012
Event Dates: 24/09/2012 - 28/09/2012
Event Location: Frankfurt, Alemania
Title of Book: Proceedings of 27th EU PVSEC 2012
Date: 2012
Subjects:
Faculty: E.T.S.I. Industriales (UPM)
Department: Física Aplicada a la Ingeniería Industrial [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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 mΩcm2.

More information

Item ID: 14104
DC Identifier: http://oa.upm.es/14104/
OAI Identifier: oai:oa.upm.es:14104
Official URL: https://www.eupvsec-proceedings.com/proceedings?paper=16374
Deposited by: Memoria Investigacion
Deposited on: 19 Dec 2012 11:15
Last Modified: 21 Aug 2017 12:07
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