Non-Toxic Buffer Layers in Flexible Cu(In,Ga)Se₂ Photovoltaic Cell Applications with Optimized Absorber Thickness

Table 2

Base parameters of the substitute buffer layers.

Parameters	ZnO	ZnS	ZnS(O,OH)	Zn1−xSnxOy	ZnSe	In2S3
τ (μm)	0.03	0.04	0.05	0.05	0.04	0.05
Eg (eV)	3.30	3.68	3.80	3.74	2.71	2.90
χe (eV)	4.60	4.13	4.24	4.06	4.09	3.85
Nd (cm^−3)	1 × 10^17	5 × 10^16	1 × 10^17	1 × 10^17	2 × 10^17	1 × 10^17
μn (cm^2 V^−1 s^−1)	100	250	200	160	60	400
μp (cm^2 V^−1 s^−1)	30	70	60	40	20	120