Abstract
The material properties and c-Si surface passivation have been investigated for Al 2 O 3 films deposited using thermal and plasma atomic layer deposition (ALD) and plasma-enhanced chemical vapor deposition (PECVD) for temperatures (T dep ) between 25 and 400°C. Optimal surface passivation by ALD Al 2 O 3 was achieved at T dep = 150-250°C with S eff < 3 cm/s for ∼2 Ω cm p-type c-Si. PECVD Al 2 O 3 provided a comparable high level of passivation for T dep = 150-300°C and contained a high fixed negative charge density of ∼6 x 10 12 cm -2 . Outstanding surface passivation performance was therefore obtained for thermal ALD, plasma ALD, and PECVD for a relatively wide range of Al 2 O 3 material properties.
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