A long-existing problem that the conductivity of amorphous silicon carbonitrides derived from polymeric precursor increases significantly with pyrolysis temperature is investigated. We show that the conductivity exhibited an Arrhenius dependence on pyrolysis temperature, with the activation energy of ∼3.41 eV. Structural analysis using Raman spectroscopy reveals that the free carbon within the material undergoes a sp3-to-sp2 transition as pyrolysis temperature increases, with the activation energy of ∼3.6 eV. We conclude that the pyrolysis-temperature induced increase in the conductivity is mainly due to the increase in the conductivity of the free carbon. A simple model is proposed to correlate the two.
|Journal||Applied Physics Letters|
|State||Published - Jun 10 2013|
Bibliographical noteFunding Information:
This work was financially supported by National Energy Technology Laboratory, Department of Energy of USA (DE-FE0007004).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)