Heat treatment

Thickness (nm)

n₀

A (μm²)

B (10⁷ μm⁴)

ITO

FTO

ITO

FTO

ITO

FTO

Before annealing

300

2.41

2.12

−0.096

−0.542

0.12

3.39

500

2.52

2.26

−0.153

−0.743

1.42

6.69

600

2.56

2.32

−0.043

−0.268

0.68

2.57

Annealing at 300˚C

300

2.38

1.83

−0.070

−0.386

0.71

3.09

500

2.59

1.93

−0.160

−0.280

1.91

1.72

600

2.62

2.03

−0.256

−0.596

2.04

4.35

Annealing at 400˚C

300

1.94

1.79

−0.163

−0.245

1.89

1.89

500

3.02

1.95

−0.199

−0.396

1.60

3.84

600

2.43

2.30

−0.042

−0.018

0.49

3.34