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Co thermal or plasma enhanced atomic layer deposition (ALD) using a metal organic precursor,Co(MeCp)2 were investigated from metal organic precursor,Co(MeCp)2,and NH3 or H2 reactant.The deposition characteristics,electrical and microstructural properties were investigated.Especially,we observed Co columnar structure formation at low substrate temperature when plasma enhanced ALD is applied with NH3 reactant.However,film growth of Co has a normal performance at the high substrate temperature.