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Table 1 Characteristics of organic solar cells with different thicknesses of the ECHD cathode interfacial layer

From: Hafnium metallocene compounds used as cathode interfacial layers for enhanced electron transfer in organic solar cells

OSCs	J_sc (mA/cm²)	V_oc (V)	FF (%)	PCE (%)
Control	8.38	0.62	45	2.34
ECHD 0.5 nm	9.43	0.59	45	2.46
ECHD 0.7 nm	10.5	0.61	46	2.96
ECHD 1.0 nm	9.7	0.60	43	2.52
ECHD 2.0 nm	7	0.59	51	1.77

OSCs, organic solar cells; ECHD, bis-(ethylcyclopentadienyl) hafnium(IV) dichloride; J_sc, short circuit current density; V_oc, open circuit voltage; FF, fill factor; PCE, power conversion efficiency.

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