Wurtzite copper-zinc-tin sulfide as a superior counter electrode material for dye-sensitized solar cells

Table 1 Photovoltaic parameters and fitted impedance parameters

CEs	Thickness (μm)	J_sc(mA/cm²)	V_oc(V)	FF (%)	PCE (%)	R_s(Ω cm²)	R_ct(Ω cm²)	Epp (V)
Pt	0.10	11.43	0.78	69.84	6.23	15.91	2.92	0.536
Wurtzite	2.12	13.41	0.75	68.69	6.89	16.20	2.78	0.528
Kesterite	2.20	10.20	0.73	65.72	4.89	17.02	3.56	0.760

Photovoltaic parameters for various DSSCs fabricated using different counter electrodes and the fitted impedance parameters extracted from fabricated symmetric cells are as follows: J_sc, short-circuit current density; V_oc, open-circuit voltage; FF, fill factor; R_s, series resistance; R_ct, charge transfer resistance.