Open AccessMicro-structuring of CIGS thin-film coated on Mo back contact by ultrafast laser ‘rail-roading’ patterning
Author(s) -
Sae Chae Jeoung,
Heung-Soon Lee,
J. S. Yahng,
Hyun Kyu Lee,
Heh Young Moon,
Kyoun Joon Kim,
Dong Geun Lee,
Duck Hoon Park,
Young Sam Yu,
Suk Jae Ji
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.016730
Subject(s) - materials science , copper indium gallium selenide solar cells , laser , laser ablation , thin film , optoelectronics , optics , composite material , nanotechnology , physics
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.