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Microtexture and Grain Boundaries in Freestanding CVD Diamond Films: Growth and Twinning Mechanisms
Authors:Tao Liu  Dierk Raabe  Weimin Mao  Stefan Zaefferer
Affiliation:1. Max‐Planck‐Institut für Eisenforschung Abteilung Mikrostrukturphysik und Umformtechnik 40237 Düsseldorf (Germany);2. Department of Materials University of Science and Technology Beijing 100083 Beijing (P. R. China)
Abstract:Three groups of free‐standing chemical vapor deposition (CVD) diamond films formed with variations in substrate temperature, methane concentration, and film thickness are analyzed using high‐resolution electron back‐scattering diffraction. Primarily {001}, {110}, and {111} fiber textures are observed. In addition, corresponding primary and higher order twinning components are found. As interfaces, high angle, low angle, primary twin, and secondary twin boundaries are observed. A growth and a twinning model are proposed based on the sp3 hybridization of the bond in the CH4 molecule that is used as the deposition medium.
Keywords:Chemical vapor deposition  Diamond  Thin films
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