SINGLE CRYSTAL SYNTHETIC DIAMOND MATERIAL

• Main Authors: MARKHAM MATTHEW LEE, COLARD PIERRE-OLIVIER FRANCOIS MARC, EDMONDS ANDREW MARK
• Format: Patent
• Language: Chinese; English
• Published: 21.09.2021
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; METALLURGY; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

Single crystal CVD diamond material comprising a total nitrogen concentration of at least 5 ppm and a neutral single substitutional nitrogen, Ns 0, to total single substitutional nitrogen, Ns, ratio of at least 0.7. Such a diamond is observed to have a relatively low amount of brown colouration despite the relatively high concentration of nitrogen. A method of making the single crystal diamond is also disclosed, the method including growing the CVD diamond in process gases comprising 60 to 200 ppm nitrogen, in addition to a carbon-containing gas,and hydrogen, wherein the ratio of carbon atoms in the carbon-containing gas to hydrogen atoms in the hydrogen gas is 0.5 to 1.5%. 单晶CVD金刚石材料，包含至少5ppm的总氮浓度和至少0.7的中性单一替位氮Ns0与总单一替位氮Ns之比。尽管氮的浓度相对高，但观察到这样的金刚石具有相对少量的棕色着色。还公开了制造单晶金刚石的方法，该方法包括在工艺气体中生长CVD金刚石，所述工艺气体除含碳气体和氢之外还包含60至200ppm氮，其中含碳气体中的碳原子与氢气中的氢原子之比为0.5至1.5％。