Journal
THIN SOLID FILMS
Volume 518, Issue 10, Pages 2897-2904Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2009.10.135
Keywords
Thin films; Photovoltaics; Solar cell; Laser scribing; Damage threshold; Laser-matter interaction; Silicon; Copper indium gallium diselenide
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The removal of thin films widely used in photovoltaics (amorphous silicon, tin oxide, zinc oxide, aluminum, and molybdenum) is studied experimentally using multi-kHz Q-switched solid-state lasers at 532 nm and 1064 nm wavelengths. The processing (scribing) is performed through the film-supporting glass plate at scribing speeds of the order of m/s. The dependence of the film removal threshold on the laser pulse duration (8 ns to 40 ns) is investigated and the results are complemented by a multi-layer thermal model used for numerical simulations of the laser-induced spatio-temporal temperature field within the samples. Possible film removal mechanisms are discussed upon consideration of optical, geometrical, thermal and mechanical properties of the layers. (C) 2009 Elsevier B.V. All rights reserved.
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