Abstract
In the present investigation, a nitrogen-doped multilayer homoepitaxial single crystal diamond is synthesized on a high-pressure high temperature (HPHT) Ib-type diamond substrate using the microwave plasma chemical vapor deposition (MPCVD) method. When 0.15 sccm of nitrogen was added in the gas phase, the growth rate of the doped layer was about 1.7 times that of the buffer layer, and large conical and pyramidal features are formed on the surface of the sample. Raman mapping and photoluminescence imaging of the polished cross sectional slice shows a broadband emission, with a characteristic zero phonon line (ZPL) at 575 nm in the doped layers, and large compressive stress was formed in the nitrogen-doped layers. X-ray topography shows that the defects at the interface can induce dislocation. The pyramid feature is formed at the defect, and more nitrogen-related defects are formed in the pyramid region. Thin nitrogen-doped multilayers were successfully prepared, and the thickness of the nitrogen-doped and buffer layers was about 650 nm each. The indentation measurements reveal that the thin nitrogen-doped multilayers are ultra-tough (at least ~22 MPa m1/2), compared to the Ib-type HPHT seed substrate (~8 MPa m1/2) and the unintentionally doped chemical vapor deposition (CVD) single crystal diamond (~14 MPa m1/2).
Highlights
It is well known that single crystal diamonds can be synthesized at a very high growth rate by microwave plasma chemical vapor deposition (MPCVD) [1,2]
It has been shown that when such a single crystal diamond is heat-treated, a combination of unusual mechanical properties can be obtained [4,5], introducing a novel method to harden the chemical vapor deposition (CVD) single crystal diamonds
We have studied the distribution of nitrogen in the thin nitrogen-doped multilayers by SIMS
Summary
It is well known that single crystal diamonds can be synthesized at a very high growth rate by microwave plasma chemical vapor deposition (MPCVD) [1,2]. These diamonds have already shown excellent mechanical properties, which has opened up new prospects for certain novel applications, such as diamond anvils [3]. It has been shown that when such a single crystal diamond is heat-treated, a combination of unusual mechanical properties can be obtained [4,5], introducing a novel method to harden the chemical vapor deposition (CVD) single crystal diamonds. The multilayered method may provide a new way to expand the application of the single crystal diamonds by optimizing their structures
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