Temp (˚C)

Leakage current (A) at −1 V

Barrier height

From I-V

Cheungs’ function dV/dln(I) vs I

(eV)

N

Rs (Ω)

n

25

2.2 ´ 10−7

0.56

5.0

560

5.2

50

3.8 ´ 10−7

0.59

4.6

362

4.9

100

1.1 ´ 10−6

0.63

3.7

165

4.0

150

3.1 ´ 10−6

0.67

3.1

78

3.4

200

1.7 ´ 10−5

0.69

2.5

38

2.7