Thin film surface processing by ultrashort laser pulses (USLP)

D. Scorticati; J. Z. P. Skolski; G. R. B. E. Römer; A. J. Huis in 't Veld; M. Workum; M. Theelen; M. Zeman

doi:10.1117/12.922270

2 May 2012 Thin film surface processing by ultrashort laser pulses (USLP)

D. Scorticati, J. Z. P. Skolski, G. R. B. E. Römer, A. J. Huis in 't Veld, M. Workum, M. Theelen, M. Zeman

Proceedings Volume 8438, Photonics for Solar Energy Systems IV; 84380T (2012) https://doi.org/10.1117/12.922270
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

In this work, we studied the feasibility of surface texturing of thin molybdenum layers on a borosilicate glass substrate with Ultra-Short Laser Pulses (USLP). Large areas of regular diffraction gratings were produced consisting of Laserinduced periodic surface structures (LIPSS). A short pulsed laser source (230 fs-10 ps) was applied using a focused Gaussian beam profile (15-30 μm). Laser parameters such as fluence, overlap (OL) and Overscans (OS), repetition frequency (100-200 kHz), wavelength (1030 nm, 515 nm and 343 nm) and polarization were varied to study the effect on periodicity, height and especially regularity of LIPSS obtained in layers of different thicknesses (150-400 nm). The aim was to produce these structures without cracking the metal layer and with as little ablation as possible. It was found that USLP are suitable to reach high power densities at the surface of the thin layers, avoiding mechanical stresses, cracking and delamination. A possible photovoltaic (PV) application could be found in texturing of thin film cells to enhance light trapping mechanisms.

Citation Download Citation

D. Scorticati, J. Z. P. Skolski, G. R. B. E. Römer, A. J. Huis in 't Veld, M. Workum, M. Theelen, and M. Zeman "Thin film surface processing by ultrashort laser pulses (USLP)", Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 84380T (2 May 2012); https://doi.org/10.1117/12.922270

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