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Hopping conduction in boron doped amorphous carbon films
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View: Figures


Image of FIG. 1.
FIG. 1.

X-ray diffraction plot for the boron doped GAC film having different boron doping levels. The numbers corresponding to each x-ray diffraction plot correspond to the sample labeled in the inset. The inset also shows the value of graphitic layers for the corresponding sample. Also shown is the TEM image of the CB700M film along with the SAED pattern.

Image of FIG. 2.
FIG. 2.

(Color online) Temperature dependence of resistivity for insulating samples CB700M2, CB700M4, and C700. (a) Variable range hopping conduction with respective values of [in accordance with Eq. (1)] in the corresponding temperature range. (b) Power law dependence at high temperature having different values of [Eq. (3)]. [Note: The and axes in (a) are in log scale, hence the plot is the same as vs ].

Image of FIG. 3.
FIG. 3.

(Color online) Square dependence of logarithmic magnetoresistance on magnetic field for C700, CB700M4, and CB700M2 samples at . The linear fitting is done to estimate the localization length.

Image of FIG. 4.
FIG. 4.

Magnetoresistance for C700, CB700M4, and CB700M2 as a function of magnetic field. The magnetoresistance plot with open symbols is at and that with solid symbols is at .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hopping conduction in boron doped amorphous carbon films