Characterization and Modeling of CdS/CdTe Heterojunction Thin-Film Solar Cell for High Efficiency Performance

Table 1

Material parameters used in the simulation [10–12].

Parameter	CdTe	CdS	ZnO (TCO)
𝐸𝑔 (eV)	1.42	2.53	3.4
Electron Affinity (eV)	4.28	4.5	4.5
𝜇n (cm^2/v·s)	500	340	100
𝜇p (cm^2/v·s)	60	50	25
Relative Dielectric Constant	10.9	8.9	9
Density of state for electron (cm^−3)	7.8×10^17	2.22×10^18	2.22×10^18
Density of state for hole (cm^−3)	1.8×10^19	1.8×10^19	1.9×10^19
Index of Refraction	2.76	2.51	2.006
Doping Density (cm^−3)	7×10^16--7×10^18 p-type	1×10^18 n-type	1×10^18 n-type
ZnO/CdS Δ𝐸𝑐 (eV)		0.0
ZnO/CdS Δ𝐸𝑣 (eV)		0.87
CdS/CdTe Δ𝐸𝑐 (eV)	0.22
CdS/CdTe Δ𝐸𝑣 (eV)	0.89