Schottky Barrier Height of Erbium Silicide on $\hbox {Si}_{1 - x}\hbox {C}_{x}$

In this letter, the Schottky barrier height of erbium silicide contacts formed on Si_1-xC_x alloys was measured. The alloys were pseudomorphically grown on Si wafers with 0% to 1.2% C occupying the substitutional sites. Schottky barrier diodes were fabricated with an ideality factor of 1.13 or less. The hole barrier height was found to be 0.73 eV independent of the C concentration. This suggests that the electron barrier height should decrease with increasing C concentration due to the reduction in the semiconductor bandgap. For 1.2% C, the electron barrier is estimated to be 0.29 eV.