Electron Transport in Polymer-Derived Amorphous Silicon Oxycarbonitride Ceramics
Abbreviated Journal Title
J. Am. Ceram. Soc.
CARBONITRIDE CERAMICS; LOCALIZED STATES; HIGH-TEMPERATURE; FILMS; CONDUCTION; CONVERSION; PRECURSOR; NITRIDE; Materials Science, Ceramics
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.
Journal of the American Ceramic Society
"Electron Transport in Polymer-Derived Amorphous Silicon Oxycarbonitride Ceramics" (2009). Faculty Bibliography 2000s. 2294.