3. Results and discussion
Three sets of films, prepared at different postdeposition oxygen annealing times (ta=30, 60 and 90 min), were characterized by X-ray diffraction measurement. Fig. 1shows the XRD pattern of the CuAlO2 thin film, annealed for 60 min. The substrate was Si (400). The pattern shows a strong (006) orientation. Similar orientations had also been observed previously [19,21]. Other peaks at (003) and (018)have also been observed. This pattern closely reflects the rhombohedral crystal structure with R3m space group [24].Films deposited at other annealing times (ta), 30 and 90 min,show identical peaks and are therefore not shown here. This indicates that postdeposition annealing time has no effect on the structural properties of the films. This is probably because, in all three cases, the annealing temperature was kept fixed (at 473 K).
Fig. 2 represents the temperature variation (from 300 to 575 K) of the conductivity (r) of the films for ta=30, 60 and 90 min. The thicknesses of the films were around 500 nm,estimated from cross-sectional SEM. An increase in the room-temperature conductivity (rRT) was observed with the
increase in annealing times (ta). (For example, films with
3. Results and discussionThree sets of films, prepared at different postdeposition oxygen annealing times (ta=30, 60 and 90 min), were characterized by X-ray diffraction measurement. Fig. 1shows the XRD pattern of the CuAlO2 thin film, annealed for 60 min. The substrate was Si (400). The pattern shows a strong (006) orientation. Similar orientations had also been observed previously [19,21]. Other peaks at (003) and (018)have also been observed. This pattern closely reflects the rhombohedral crystal structure with R3m space group [24].Films deposited at other annealing times (ta), 30 and 90 min,show identical peaks and are therefore not shown here. This indicates that postdeposition annealing time has no effect on the structural properties of the films. This is probably because, in all three cases, the annealing temperature was kept fixed (at 473 K).Fig. 2 represents the temperature variation (from 300 to 575 K) of the conductivity (r) of the films for ta=30, 60 and 90 min. The thicknesses of the films were around 500 nm,estimated from cross-sectional SEM. An increase in the room-temperature conductivity (rRT) was observed with theincrease in annealing times (ta). (For example, films with
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