Cu concentration (%)

Bandgap (eV)

Crystallite size (nm)

Film Thickness (nm)

x = 0.00

3.60

13

400

x = 0.01

3.55

12

415

x = 0.03

3.49

9

435

x = 0.05

3.47

11

500

x = 0.1

3.35

21

610

x = 0.2

3.32

20

750