Nitrogen Desorption and Positron Sensitive Defect of CVD Diamond  

作　　者：Kasey R. Lund Kelvin G. Lynn Marc H. Weber Chao Liu Elgin Eissler 

机构地区：[1]National Superconducting Cyclotron Laboratory Michigan State University, East Lansing, MI, USA [2]Center for Materials Research, Department of Physics, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, USA [3]Center for Materials Research, Washington State University, Pullman, WA, USA [4]II-VI Incorporated, Saxonburg, PA, USA

出　　处：《Journal of Modern Physics》2017年第5期770-785,共16页现代物理（英文）

摘　　要：The chemical vapor deposition (CVD) process can produce single or poly-crystalline diamond samples of high purity or with controlled doping concentrations. The defect type in the CVD diamonds can be changed by heating the samples. Controlling the defect type can be used to create devices for quantum diamond switches that could be used in radiation sensors and quantum information technology. Eight samples of CVD diamonds were analyzed with Doppler broadening of positron annihilation radiation (DBAR) before and after annealing in high vacuum with an electron gun. Between temperatures of 1700 - 1850 K, nitrogen was liberated from the diamond sample. At these high temperatures, the surface was graphitized and a change in the color and transparency of the diamond was observed. Some of the samples were analyzed with DBAR during periods with and without light. The defect properties were observed to change depending on the time exposure to the positron beam and were then regenerated by exposure to light. The DBAR data is compared to photoluminescence data and a time varying defect state is discussed for detector and optical grade type II CVD diamonds.The chemical vapor deposition (CVD) process can produce single or poly-crystalline diamond samples of high purity or with controlled doping concentrations. The defect type in the CVD diamonds can be changed by heating the samples. Controlling the defect type can be used to create devices for quantum diamond switches that could be used in radiation sensors and quantum information technology. Eight samples of CVD diamonds were analyzed with Doppler broadening of positron annihilation radiation (DBAR) before and after annealing in high vacuum with an electron gun. Between temperatures of 1700 - 1850 K, nitrogen was liberated from the diamond sample. At these high temperatures, the surface was graphitized and a change in the color and transparency of the diamond was observed. Some of the samples were analyzed with DBAR during periods with and without light. The defect properties were observed to change depending on the time exposure to the positron beam and were then regenerated by exposure to light. The DBAR data is compared to photoluminescence data and a time varying defect state is discussed for detector and optical grade type II CVD diamonds.

关 键 词：CVD DIAMOND Detectors POSITRON ANNIHILATION Spectroscopy DIVACANCY 

分 类 号：R73[医药卫生—肿瘤]