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Plot of the absorption squared (αhν)2 versus phonon energy for (a) as deposited ZnO:Ga films (blue line), and N-implanted ZnO:Ga films (implant dose of 2 × 1016 cm-2) (b) not annealed (green line); (c) annealed in N2 at 400 for 10 s (red line); (c) annealed in N2 at 550 for 10 s (black line).
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