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Title: Anomalous crystallization of hydrogenated amorphous silicon during fast heating ramps
Author: Farjas Silva, Jordi
Serra-Miralles, J.
Roura Grabulosa, Pere
Bertrán Serra, Enric
Roca i Cabarrocas, P. (Pere)
Keywords: Calorimetria
Issue Date: 2005
Publisher: Materials Research Society
Abstract: Thermal crystallization experiments carried out using calorimetry on several a-Si:H materials with different microstructures are reported. The samples were crystallized during heating ramps at constant heating rates up to 100 K/min. Under these conditions, crystallization takes place above 700 C and progressively deviates from the standard kinetics. In particular, two crystallization processes were detected in conventional a-Si:H, which reveal an enhancement of the crystallization rate. At100 K/min, such enhancement is consistent with a diminution of the crystallization time by a factor of 7. In contrast, no systematic variation of the resulting grain size was observed. Similar behavior was also detected in polymorphous silicon and silicon nanoparticles, thus showing that it is characteristic of a variety of hydrogenated amorphous silicon materials.
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It is part of: Journal of Materials Research, 2005, vol. 20, núm. 2, p. 277-281
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ISSN: 0884-2914
Appears in Collections:Articles publicats en revistes (Física Aplicada)

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