원자층 진공 증착 장비(Atomic Layer Deposition)
타 증착 장비간 비교
CVD | ALD | |
---|---|---|
Step coverage | Good(~70%) | Excellent(~95%) |
Deposition temp | < 400℃ | < 400℃ |
Deposition reaction | surface reaction + Gas phase reaction | surface reaction |
Particle | · | Good |
Contamination | 5~3 at%(C,O) | < 1at% |
Thickness control | Depend on Gas flow rate, temp, Time, etc | Good(Depend on # of Cycle) |
Repeatability | OK | Good |
Compostion | Bad | Good |
ALD 기술 개요