Parameters

Layers

CIGS

CdS

ZnO

Thickness (nm)

2000

50

80

Bangap (eV)

1.0 - 1.6*

2.4

3.3

Electron affinity (eV)

4.5 - 3.9

4.45

4.6

Dielectric constant

15 - 10

10

9.0

Electron mobility (cm2/Vs)

100

100

100

Hole mobility (cm2/Vs)

25

25

25

Density of states in CB (cm−3)

1 × 1018

1 × 1018

1 × 1018

Density of states in VB (cm−3)

1 × 1019

1 × 1019

1 × 1019

Shallow donor conc. (cm−3)

-

1 × 1018

1 × 1017

Shallow acceptor conc. (cm−3)

4.1015, 3.1015, 6.1015 [16]

-

-

Radiative recombination (cm3・s−1)

1 × 10−10

1 × 10−10

1 × 10−10

Surface recombination velocity (cm・s−1)

1 × 106 (back)

-

-

Defect type

Donor

Acceptor

Acceptor

Defect distribution

Ga−dep.*

Uniform

Uniform

Defect density (cm−3)

(see Figure 2)*

6 × 1017

1 × 1016

Defect capture cross section e- (cm2)

1 × 10−15

1 × 10−15

1 × 10−15

Defect capture cross section h (cm2)

5 × 10−13

5 × 10−13

5 × 10−13