Article ID Journal Published Year Pages File Type
9697398 Diamond and Related Materials 2005 5 Pages PDF
Abstract
The incorporation of ≈1019 B-cm−3 has several effects in the cathodoluminescence spectra of homoepitaxial MPCVD film: (1) the TO free exciton and all the boron-bound excitons' peaks broaden and shift downward in energy (“electronic” effect). Plasma post-hydrogenation (P-H) destroys all of them. (2) It induces a low concentration of several species of defects (“structural” effect): (i) a broad band around 4.99 eV with a shoulder around 4.86 eV, small bands on a broad 4.68 eV band, peaks and bands between 2.9 and 4.5 eV, the “2.8 eV” A band. They originate from B-induced species of defects only existing when [B]≥≈1019 cm−3. Most of them disappear after P-H. (ii) broad bands around 3.65, 4.1 and 4.68 eV. They originate from B-induced species of defects already existing when [B]<1017 cm−3. P-H prevents the formation of free exciton, doesn't induce any new defect giving radiative recombination above 2.6 eV, heals some structural defects of diamond.
Related Topics
Physical Sciences and Engineering Engineering Electrical and Electronic Engineering
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