Theoretical Investigation of Fluorinated and Hydrocenated Diamond <100> Films


To investigate some of the fundamental differences between halogen and hydrogen assisted diamond film growth we have performed several calculations related to the <100> diamond surface. The models used in these investigations include ten-layer periodic slabs of free standing fluorinated diamond films as well as isolated clusters [C21F6H20]. For purposes of comparison, we have also performed calculations on models of the hydrogenated <100> surface. The calculations are performed within the density-functional framework using LCAO and LAPW computational methods. We have considered two geometries of a monofluoride surface. The first surface, best described as an ideal l×l surface with a monolayer of ionically bonded fluorines, exhibits a metallic density of states in contrast to a 2×l reconstructed surface with chemically bonded fluorines that is found to be insulating. We compare theoretical carbon core level shifts with experimental values and discuss growth models based on these surface calculations.

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This work was supported in part by SDIO/IST contract N00014-92-WX-2C024. The computational work was performed on Naval Research Laboratory and the Primary Oceanographic Prediction System CRAY computers.

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Correspondence to Mark R. Pederson or Warren E. Pickett.

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Pederson, M.R., Pickett, W.E. Theoretical Investigation of Fluorinated and Hydrocenated Diamond <100> Films. MRS Online Proceedings Library 270, 389–394 (1992).

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