Sherbini and Yousef's data of bornite indicate the existence of both n-type and p-type conduction. Horton has analysed these data according to the well-known single barrier theory. We tried to analyse the same data according to the double barrier theory presented recently by T. Numata. Using the results of Horton's analysis for the first barrier, we obtained the values of the contact potential differences φ
n2 and φ
p2 and the diffusion potentials V
Dn2 and V
Dp2 for the second barrier, which are given in Tables IV and V.
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