High-field transport in amorphous carbon and carbon nitride films

Kumar, Sushil and Godet, C. and Goudovskikh, A. and Kleider, J.P. and Adamopoulos, George and Chu, V. (2004) High-field transport in amorphous carbon and carbon nitride films. Journal of Non-Crystalline Solids, 338. pp. 349-352. ISSN 0022-3093

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The temperature and electric field dependence of the current density in hydrogenated amorphous carbon and carbon nitride sandwich devices show a T-1/4 dependence of the ohmic conductivity sigma = sigma(00) - exp[-(T-0/T)(1/4)] characteristic of 3D hopping, a linear correlation between the apparent Lnsigma(00)(F) and T-0(F) values, and a F/T-3/2 scaling of sigma(F, T). The F-2 dependence of Lnsigma(F, T) at intermediate fields, provides similar values of the decay length gamma(-1) of localized 71 state wavefunctions in a-CNx:H (2.4 nm) and a-C:H (2.8 nm) films. The larger conductivity in nitrogen-rich alloys is attributed to a combined effect of N-induced increase in the pi-state density and ordering of the sp(2) phase.

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Journal of Non-Crystalline Solids
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29 Oct 2012 16:26
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21 Nov 2022 22:55