title: Ion bombardment induced buried lateral growth: the key mechanism for the synthesis of single crystal diamond wafers.
abstract: A detailed mechanism for heteroepitaxial diamond nucleation under ion bombardment in a microwave plasma enhanced chemical vapour deposition setup on the single crystal surface of iridium is presented. The novel mechanism of Ion Bombardment Induced Buried Lateral Growth (IBI-BLG) is based on the ion bombardment induced formation and lateral spread of epitaxial diamond within a ~1 nm thick carbon layer. Starting from one single primary nucleation event the buried epitaxial island can expand laterally over distances of several microns. During this epitaxial lateral growth typically thousands of isolated secondary nuclei are generated continuously. The unique process is so far only observed on iridium surfaces. It is shown that a diamond single crystal with a diameter of ~90 mm and a weight of 155 carat can be grown from such a carbon film which initially consisted of 2 · 1013individual grains.
authors.affiliation: Universität Augsburg, Institut für Physik, D-86135 Augsburg, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Schreck
authors.affiliation: Universität Augsburg, Institut für Physik, D-86135 Augsburg, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Gsell
authors.affiliation: Universität Augsburg, Institut für Physik, D-86135 Augsburg, Germany.
authors.forename: Rosaria
authors.initials: R
authors.lastname: Brescia
authors.affiliation: Universität Augsburg, Institut für Physik, D-86135 Augsburg, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Fischer