Doping Efficiency in Cobalt-Doped ZnO Nanostructured Materials

Table 2

Activation energies for different cobalt-doped ZnO.

Co %	Activation energy (meV)
	Cobalt nitrate-doped ZnO		Cobalt chloride-doped ZnO
	0.1 M	1 M	0.1 M	1 M
0	56.63	63.51	66.63	64.13
5	49.56	59.32	61.29	58.62
10	47.83	56.05	57.08	54.32
15	45.05	52.58	52.87	50.21
20	34.09	46.39	49.16	41.23