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- W2079562181 abstract "The kinetics of laser pulse-induced crystallization of amorphous Ge films are investigated by time-resolved transmission electron microscopy. Crystallization starts above a threshold energy of ≈ 4 μJ (laser pulse 532 nm, 20 ns, 65 μm ∅︁) with a delay of ≈ 10 ns, decreasing with increasing energy, after the laser pulse and proceeds by spherulitic growth — in “explosive” films — with ≈ 10 m/s at the centre and by growth of plates with ≈ 20 m/s at the edge of the irradiated area Delays and velocities of crystallization are interpreted with a kinetic model based on nucleation growth, and crystallization of a supercooled liquid in a superheated amorphous solid. Die Kinetik der laserpuls-induzierten Kristallisation amorpher Ge-Schichten wird mit zeitauf-gelöster Transmissionselektronenmikroskopie untersucht. Die Kristallisation setzt oberhalb einer Energieschwelle von ≈ 4 μJ ein (Laserpuls 532 nm, 20 ns, 65 μm ∅︁) und erfolgt verzögert (≈ 10 ns) nach dem Laserpuls. Die Verzögerung nimmt ab mit wachsender Pulsenergie. Im Zentrum des bestrahlten Bereichs entstehen — bei „explosiven”︁ Schichten — Sphärulite mit ≈ 10 m/s und am Rand Plattenkristalle mit ≈ 20 m/s. Verzögerungen und Geschwindigkeiten der Kristallisation werden durch Keimbildung, Ausbreitung und kristalline Erstarrung einer unterkühlten Flüssigkeit in einem überhitzten amorphen Festkörper gedeutet." @default.
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- W2079562181 date "1985-09-16" @default.
- W2079562181 modified "2023-10-10" @default.
- W2079562181 title "Kinetics of Laser-Induced Crystallization of Amorphous Germanium Films" @default.
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- W2079562181 doi "https://doi.org/10.1002/pssa.2210910103" @default.
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