Memorias de investigación
Communications at congresses:
SELECTIVE ABLATION OF PHOTOVOLTAIC MATERIALS WITH UV LASER SOURCES FOR MONOLITHIC INTERCONNECTION OF DEVICES BASED ON a-Si:H
Year:2008

Research Areas
  • Mechanical engineering,
  • Magnetic materials

Information
Abstract
Lasers are essential tools for cell isolation and monolithic interconnection in thin-filmsilicon photovoltaic technologies. Laser ablation of transparent conductive oxides (TCO), 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 difficulties 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 UV wavelengths of Diode-Pumped Solid-State Laser Sources (DPSS). 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 wavelengths 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 lasers sources as an alternative to standard backscribing process in device fabrication.
International
Si
Congress
E-MRS SPRING MEETING 2008. SYMPOSIUM K
960
Place
ESTRASBURGO (FRANCIA)
Reviewers
Si
ISBN/ISSN
0000000000
Start Date
26/05/2008
End Date
30/05/2008
From page
1
To page
1
ABSTRACTS WEB EMRS
Participants
  • AUTOR: F. VILLAR CeRMAE ¿ Dept. Física Aplicada i Òptica, Universitat de Barcelona
  • AUTOR: J.J. GANDÍA Dept. de Energías Renovables. Energía Solar Fotovoltaica.CIEMAT
  • Autor: Sara Lauzurica Santiago UPM
  • Autor: Carlos Luis Molpeceres Alvarez UPM
  • Autor: Jose Luis Ocaña Moreno UPM
  • AUTOR: O. NOS CeRMAE ¿ Dept. Física Aplicada i Òptica, Universitat de Barcelona
  • Autor: Juan José García-Ballesteros . UPM
  • AUTOR: J. BERTOMEU CeRMAE ¿ Dept. Física Aplicada i Òptica, Universitat de Barcelona
  • Autor: Miguel Morales Furio 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