Table 1.

Bulk resistivity values measured with different contact configurations.

Sample Contacts	ρ fwd (Ω·cm)	ρ rev (Ω·cm)
Bi–Au	2.5–3 × 109	1.8–5.9 × 108
Au–Au	9.5 × 108	2.8 × 109
InGa–Au	2 × 109
In–Au	2.5 × 109	1010