Table 2.

Minimum thickness achieved for the different materials over the ITO substrate.

	PEDOT:PSS	PEIE	ZnO + PEIE
Minimum thickness	15.8 ± 0.6 nm	4.8 ± 0.1 nm	15.3 ± 0.6 nm
Surface roughness (RMS)	1.1 nm	0.36 nm	2.6 nm