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Electron Transport in Polymer‐Derived Amorphous Silicon Oxycarbonitride Ceramics
Author(s) -
Wang Yansong,
Jiang Tao,
Zhang Ligong,
An Linan
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03044.x
Subject(s) - thermal conduction , variable range hopping , materials science , amorphous solid , ceramic , condensed matter physics , electron , silicon , amorphous silicon , polymer , electrical resistivity and conductivity , atmospheric temperature range , composite material , thermodynamics , chemistry , crystalline silicon , optoelectronics , electrical engineering , physics , crystallography , quantum mechanics , engineering
The electron transport behavior of polymer‐derived amorphous silicon oxycarbonitride ceramics is studied by measuring their temperature‐dependent electrical conductivities. The experimental results are analyzed using theoretical models. The results reveal that the materials exhibit three conduction mechanisms: conduction in extended states, conduction in band tails, and conduction in localized states. Particularly, it is found that in a low‐temperature regime, the conduction of the materials follows a band tail hopping mechanism, rather than the previously assumed variable range hopping mechanism. The results also reveal that energy gaps such as E C − E F and E C − E A decrease with increasing pyrolysis temperature.