Interesting trends in direct current electrical conductivity of chemical vapor deposited diamond sheets

Sikder, A. K.; Misra, D. S.; Palnitkar, Umesh; Shirodkar, V. S.
August 2001
Journal of Applied Physics;8/1/2001, Vol. 90 Issue 3
Academic Journal
Self-supported diamond sheets of the thickness ranging from 15 to 30 μm were prepared using hot filament chemical vapor deposition technique. The controlled variation of the deposition parameters resulted in the sheets with varying amount of nondiamond impurities. Routine characterization of the sheets was carried out using scanning electron microscopy, x-ray diffractometry, Raman spectroscopy, Fourier transform infrared spectroscopy, and Positron annihilation spectroscopy techniques. Detailed measurements of room temperature electrical conductivity (σ[sub 300]), current–voltage (I–V) characteristics, and annealing studies on the sheets deposited with various structural disorder have yielded useful information about the electrical conduction in this interesting material. σ[sub 300] and I–V characteristic measurements were done in sandwiched configuration taking care off the surface effects. The diamond sheets deposited at low deposition pressure (P[sub d]<60 Torr) contain negligible nondiamond impurities and show σ[sub 300]≅10[sup -6]–10[sup -7] S.cm[sup -1]. The I–V characteristics in these sheets show space charge limited conduction behavior with I∝V[sup n] and n>1, in high voltage range. In contrast the sheets deposited at higher pressure (60 Torr and higher), containing high concentration of nondiamond impurities, show a sharp reduction in the values of σ[sub 300]. Interestingly, the conduction in these sheets is ohmic with n values nearly equal to unity. Similarly the sheets deposited with nitrogen also show a sharp reduction in σ[sub 300]. Annealing of all types of diamond sheets results in a decrease in σ[sub 300] values by several orders of magnitude. In the sheets deposited at low P[sub d], the n values increase sharply with annealing. On the other hand the values of n in the sheets deposited at higher pressure remain constant with annealing. The above results are ...


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