Photoluminescence of Zinc Oxide Nanowires: The Effect of Surface Band Bending

Table 1

The E₂-to-LO Raman intensity ratios and the UV-to-GL PL intensity ratios collected before the annealing treatments (as-grown) and after the annealing treatments.

	As-grown	Oxygen annealing	Vacuum annealing
E2/1st LO	4.3	4.2	3.6
E2/2nd LO	0.23	0.22	0.18
UV/GL	0.4	0.023	0.9