Improved Indium-Free Transparent ZnO/Metal/ZnO Electrode through a Statistical Experimental Design Method

Table 1

Experimental parameters and corresponding levels used in this study.

Experimental parameters	Corresponding levels
	1	2	3
: power of sputtering (W)	50	150	300
: Ag thickness (nm)	5	10	15
: postdeposition annealing (°C)	200	300	400