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Anomalous crystallization of hydrogenated amorphous silicon during fast heating ramps

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

¬© Journal of Materials Research, 2005, vol. 20, n√ļm. 2, p. 277-281

Materials Research Society

Author: Farjas Silva, Jordi
Serra-Miralles, J.
Roura Grabulosa, Pere
Date: 2005
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
Format: application/pdf
ISSN: 0884-2914 (versió paper)
2044-5326 (versió electrònica)
Document access: http://hdl.handle.net/10256/8576
Language: eng
Publisher: Materials Research Society
Collection: Reproducció digital del document publicat a: http://dx.doi.org/10.1557/JMR.2005.0037
Articles publicats (D-F)
Is part of: ¬© Journal of Materials Research, 2005, vol. 20, n√ļm. 2, p. 277-281
Rights: Tots els drets reservats
Subject: Silici
Silicon
Nanopartícules
Nanoparticles
Microestructura
Microstructure
Calorimetria
Calorimetry
Title: Anomalous crystallization of hydrogenated amorphous silicon during fast heating ramps
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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