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Applicability of one‐dimensional diffusion model for step coverage analysis—Comparison with a simple Monte Carlo method

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2 Author(s)
Akiyama, Y. ; Institute of Advanced Material Study, Kyushu University, Kasuga, Fukuoka 816, Japan ; Imaishi, N.

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Applicability of a one‐dimensional reaction‐diffusion model (ORDM) as a tool for analyzing the gas–solid phase transition rate process during chemical vapor deposition is tested by comparing its results with those predicted by a simple Monte Carlo method. The results reveal that the ORDM is applicable when the conditions of Knudsen number (Kn)≪0.03, aspect ratio (As)≳1.0, and reactive sticking coefficient (η)≪0.1 are fulfilled. At large Kn and large η, the ORDM gives quite an erroneous result. The ORDM is also applicable to predict the grown film shape when η≪0.1, Kn ≫1.0, and As≳2.0. © 1995 American Institute of Physics.

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Applied Physics Letters  (Volume:67 ,  Issue: 5 )