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Thermally-Induced Structural Transformations on Polymorphous Silicon
Rath, Chandana; Farjas Silva, Jordi; Roura Grabulosa, Pere; Kail, F.; Roca i Cabarrocas, P. (Pere); Bertrán Serra, Enric
Universitat de Barcelona
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.
26-07-2011
Silici
Calorimetria
Nanopartícules
Silicon
Calorimetry
Nanoparticles
(c) Materials Research Society, 2005
Artículo
Materials Research Society
         

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