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|Thermally-Induced Structural Transformations on Polymorphous Silicon
Farjas Silva, Jordi
Roura Grabulosa, Pere
Roca i Cabarrocas, P. (Pere)
Bertrán Serra, Enric
|Materials Research Society
|Polymorphous Si is a nanostructured form of hydrogenated amorphous Si that contains a small fraction of Si nanocrystals or clusters. Its thermally induced transformations such as relaxation, dehydrogenation, and crystallization have been studied by calorimetry and evolved gas analysis as a complementary technique. The observed behavior has been compared to that of conventional hydrogenated amorphous Si and amorphous Si nanoparticles. In the temperature range of our experiments (650700 C), crystallization takes place at almost the same temperature in polymorphous and in amorphous Si. In contrast, dehydrogenation processes reflect the presence of different hydrogen states. The calorimetry and evolved gas analysis thermograms clearly show that polymorphous Si shares hydrogen states of both amorphous Si and Si nanoparticles. Finally, the total energy of the main SiH group present in polymorphous Si has been quantified.
|Reproducció del document publicat a: http://dx.doi.org/10.1557/JMR.2005.0322
|It is part of:
|Journal of Materials Research, 2005, vol. 20, núm. 9, p. 2562-2567
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|Articles publicats en revistes (Física Aplicada)
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