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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 18 — Aug. 29, 2011
  • pp: 16730–16738

Micro-structuring of CIGS thin-film coated on Mo back contact by ultrafast laser ‘rail-roading’ patterning

Sae Chae Jeoung, Heung-Soon Lee, Ji Sang Yahng, Hyun Kyu Lee, Heh Young Moon, Kyoun Joon Kim, Dong Geun Lee, Duck Hoon Park, Young Sam Yu, and Suk- Jae Ji  »View Author Affiliations


Optics Express, Vol. 19, Issue 18, pp. 16730-16738 (2011)
http://dx.doi.org/10.1364/OE.19.016730


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Abstract

We report selective patterning process, laser ‘rail-roading’ scribing method, of which operating principle is based on transient force balance between the material properties including cohesion and adhesion forces subjected to underlying substrate and laser-induced shock compression and shear forces. By using dual fs-laser beam lines with an interval larger than laser spot size, we provide a proof of the concept by patterning the photovoltaic modules based on CIGS (Cu(In,Ga)Se2) coated on Mo electrode. With varying the interval between the two laser beam tracks, we can provide intact Mo back contact surface without any residues in a manner of more facile, high-speed and high scribing efficiency. We have interpreted the effect of the ambient gases and grooving width on the scribing performance in terms of the cohesion forces between the grains of CIGS thin films as well as adhesion force between underlying Mo layer and CIGS, which are mainly governed by local laser ablation and peening process followed by laser-induced shock compression, respectively.

© 2011 OSA

OCIS Codes
(220.4000) Optical design and fabrication : Microstructure fabrication
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(310.6845) Thin films : Thin film devices and applications

ToC Category:
Laser Microfabrication

History
Original Manuscript: July 14, 2011
Revised Manuscript: August 8, 2011
Manuscript Accepted: August 11, 2011
Published: August 15, 2011

Citation
Sae Chae Jeoung, Heung-Soon Lee, Ji Sang Yahng, Hyun Kyu Lee, Heh Young Moon, Kyoun Joon Kim, Dong Geun Lee, Duck Hoon Park, Young Sam Yu, and Suk- Jae Ji, "Micro-structuring of CIGS thin-film coated on Mo back contact by ultrafast laser ‘rail-roading’ patterning," Opt. Express 19, 16730-16738 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-18-16730


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  17. The shock provided by successive pulse trains in addition to that by individual laser pulse exposure should contribute to the overall external forces if the pulse repetition rate is fast than the relaxation rate of shock pressure. And also, we cannot completely rule out the possibility of the contribution of high-pressure gas blowing to the material removal accompanied with laser-induced shock propagation along CIGS/Mo interface. However, we tentatively neglect the contribution of gas blowing since it is so complicated to analyze the external force applied both by shock pressure from high-repetition rate laser pulses and by gas pressure in quantitatively with current experimental observation.

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