All-Vacuum-Deposited Bifacial Cu₂ZnSnSe₄ Photovoltaic Cells with Sputtered Cd-Free Buffer Layer

Table 2

Photovoltaic properties of solar cells prepared with the 1-cycle and 4-cycle specimens.

AM1.5G						Dark
		Voc (V)	Jsc (mA/cm^2)	FF (%)	Efficiency (%)	Rsh (Ω˙cm^2)	Rs (Ω˙cm^2)	Junction rectifying character
1-Cycle	Bifacial	N.A.	N.A.	N.A.	N.A.	20	2	3.91
	Front	0.09	13.27	33.5	0.4
	Rear	N.A.	N.A.	N.A.	N.A.
4-Cycle	Bifacial	0.31	29.32	45.32	4.13	650	2.2	29
	Front	0.3	27.05	47.93	3.89
	Rear	0.17	3.3	48.13	0.27