Memorias de investigación
Research Publications in journals:
Selective ablation of photovoltaic materials with UV laser sources for monolithic interconnection of devices based on a-Si:H
Year:2009

Research Areas
  • Mechanical engineering,
  • Construction materials

Information
Abstract
Lasers are essential tools for cell isolation and monolithic interconnection in thin-film-silicon photovoltaic technologies. Laser ablation of transparent conductive oxides (TCOs), amorphous silicon structures and back contact removal are standard processes in industry for monolithic device interconnection. However, material ablation with minimum debris and small heat affected zone is one of the main difficulty is to achieve, to reduce costs and to improve device efficiency. In this paper we present recent results in laser ablation of photovoltaic materials using excimer and UVwavelengths of diode-pumped solid-state (DPSS) laser sources.We discuss results concerning UV ablation of different TCO and thin-film silicon (a-Si:H and nc-Si:H), focussing our study on ablation threshold measurements and process¿quality assessment using advanced optical microscopy techniques. In that way we show the advantages of using UV avelengths for minimizing the characteristic material thermal affection of laser irradiation in the ns regime at higher wavelengths. Additionally we include preliminary results of selective ablation of film on film structures irradiating from the film side (direct writing configuration) including the problem of selective ablation of ZnO films on a-Si:H layers. In that way we demonstrate the potential use of UV wavelengths of fully commercial laser sources as an alternative to standard backscribing process in device fabrication.
International
Si
JCR
Si
Title
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECH
ISBN
0921-5107
Impact factor JCR
1,577
Impact info
Volume
159-160
Journal number
0
From page
18
To page
22
Month
MARZO
Ranking
Participants
  • Participante: F. VILLAR CeRMAE Dept. Física Aplicada i Òptica, Universitat de Barcelona
  • Participante: J. J. GANDÍA Dept. de Energías Renovables, Energía Solar Fotovoltaica, CIEMAT
  • Autor: Carlos Luis Molpeceres Alvarez UPM
  • Participante: O. NOS CeRMAE Dept. Física Aplicada i Òptica, Universitat de Barcelona
  • Autor: Sara Lauzurica Santiago UPM
  • Participante: J. BERTOMEU CeRMAE Dept. Física Aplicada i Òptica, Universitat de Barcelona
  • Autor: Juan José García-Ballesteros . UPM
  • Autor: Miguel Morales Furio UPM
  • Autor: Gonzalo Guadaño Ayuso UPM
  • Autor: Jose Luis Ocaña Moreno UPM
  • Autor: Susana Fernández Robledo UPM

Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería y Aplicaciones del Láser
  • Centro o Instituto I+D+i: Centro Laser
  • Departamento: Física Aplicada a la Ingeniería Industrial