Abstract:
Copper aluminium oxide (CuAlO2
) thin films were deposited on Si (100) by reactive
dc magnetron co-sputtering technique under substrate temperature of 200 °C for 60 minutes.
After the deposition, specimens were annealed at temperature of 800, 900 and 1000 °C in the air
ambience for 60 minutes. The effect of annealing temperature on properties of CuAlO2
thin films
were studied. Crystal structure, roughness, elemental composition and surface morphology were
determined by using XRD, AFM, EDX,FE-SEM and Four-point probe techniques, respectively.
The XRD results indicated that as-deposited films were amorphous while postannealling films
showed that 2H-CuAlO2 peaks at (100) and (101), 3R-CuAlO2 peak at (0111). In addition, the
peak of CuAl2O4
, CuO and Al2O3
can be detected as well. The film thickness increases with
increasing annealing temperature. The roughness of thin films were in the range of 2.63 -5.97
nm. Elemental composition of the as-deposited film and postannealed films at temperature of 800
and 900 °C have a similar propotion, but when the annealing temperature was increase to 1000 °C
affect the elemental composition has changed dramatically and the average grain size increases
with increase of annealing temperature. Resistivity of the as-deposited film is the lowest in the
range of 2.81-3.57 Ω∙cm.