Figure 7From: Effects of doping and annealing on properties of ZnO films grown by atomic layer deposition Optical spectra of undoped ZnO films before and after annealing. (a) Absorption spectra; (b) PL spectra of undoped ZnO films before and after annealing in Ar, N2, and air ambient; (c) normalized PL spectra of the undoped films after annealing in Ar for different times; normalized PL spectra annealed in Ar or air for 2 h are also inserted.Back to article page