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Impact of solidification dynamics on crystal properties of silicon molten by a nanosecond laser pulse

: Meyer, F.; Büchler, A.; Brand, A.A.; Dasa, M.K.; Nekarda, J.F.; Preu, R.


Applied physics. A 124 (2018), Art. 254, 5 pp.
ISSN: 0340-3793
ISSN: 0721-7250
ISSN: 0947-8396 (Print)
ISSN: 1432-0630 (Online)
Journal Article
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Photovoltaik; Silicium-Photovoltaik; Charakterisierung von Prozess- und Silicium-Materialien; Kontaktierung und Strukturierung; melting; crystallization; spectroscopy; microscopy

In this study, we use pump-probe microscopy to examine the melting and solidification dynamics of silicon during and after a UV laser pulse with a duration of 30ns. Below the ablation threshold, we observe lateral melt front contraction velocities of up to 600ms−1. The peak velocities spatially coincide with a ring of lower crystallinity within the formerly molten area, as we show with spatially resolved Raman spectroscopy.