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

Table 1

Number of stacked layers of different precursors and atomic percentages of CZTSe absorber layers measured by EDS.

	Cu (%)	Zn (%)	Sn (%)	Se (%)	Cu/(Zn + Sn)	Zn/Sn
1-Cycle	26.14	15.74	8.41	49.71	1.08	1.87
2-Cycle	25.95	15.53	9.03	49.49	1.06	1.72
3-Cycle	25.68	14.49	10.45	49.38	1.03	1.39
4-Cycle	24.32	13.34	11.58	50.76	0.98	1.15
1-Cycle-P	47.15	28.83	24.02		0.89	1.2
2-Cycle-P	47.03	28.87	24.1		0.89	1.2
3-Cycle-P	47.02	28.85	24.13		0.89	1.2
4-Cycle-P	46.99	28.86	24.15		0.89	1.2