n-type conductivity in ultrananocrystalline diamond films

Williams, Oliver A.; Curat, Stephen; Gerbi, Jennifer E.; Gruen, Dieter M.; Jackman, Richard B.
September 2004
Applied Physics Letters;9/6/2004, Vol. 85 Issue 10, p1680
Academic Journal
Hall effect measurements have been carried out to determine the carrier density and mobilities in ultrananocrystalline diamond films grown with added nitrogen. The results show clear n-type conductivity with very low thermal activation energy. Mobility values of 1.5 cm2 V-1 s-1 are found for a sheet carrier concentration of 2×1017 cm-2. These measurements indicate that ultrananocrystalline films grown with high nitrogen levels in the growth gas mixture can have bulk carrier concentrations of up to 1021, which is very high for diamond films. The n-type nature of this material was also confirmed by Seebeck effect measurements.


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