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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/3319

Title: Incorporation of lithium in single crystal diamond: diffusion profiles and optical and electrical properties
Authors: te Nijenhuis, J
Cao, GZ
Smits, PCHJ
van Enckevort, WJP
Giling, LJ
Alkemade, P.F.A.
NESLADEK, Milos
REMES, Zdenek
Issue Date: 1997
Publisher: ELSEVIER SCIENCE SA LAUSANNE
Citation: DIAMOND AND RELATED MATERIALS, 6(11). p. 1726-1732
Abstract: Doping of diamond by in-diffusion of lithium in natural type Ia and IIa single crystal diamond plates has been investigated. The lithium incorporation was realized by direct in-diffusion from a Li2O source at temperatures between 400 and 650 degrees C. Using secondary ion mass spectroscopy (SIMS) depth profiling, high concentrations of lithium, up to a level of 8.0 x 10(21) cm(-3) and gradually decreasing to 1.0 x 10(19) cm(-3) at a depth of 0.5 mu m below the surface, were measured. From these profiles the diffusion constant of lithium in diamond was determined to be D-Li(T)=2 x 10(-10) exp (-0.9 eV/kT) cm(2) s(-1). The activation energy for diffusion of 0.9+/-0.3 eV is in agreement with the theoretical Literature value of 0.85 eV. Cathodoluminescence spectroscopy showed that the blue band-A luminescence, which is characteristic for natural type IIa diamond, is largely quenched by the presence of lithium. A shift of the maximum luminescence intensity towards higher energy values has been found. From photothermal deflection spectroscopy and optical transmission measurements no new optically active defect is observed after lithium in-diffusion. However, these measurements indicated the occurrence of a large concentration of light scattering centres, the size of which is IO nm or less. This suggests that lithium is clustered in the crystal volume just below the specimen surface and therefore is not electrically active.
Notes: DELFT UNIV TECHNOL,DEPT APPL PHYS,DIMES NS,NL-2628 CJ DELFT,NETHERLANDS. LIMBURGS UNIV CTR,DIV MAT PHYS,INST MAT RES,B-3590 DIEPENBEEK,BELGIUM. ACAD SCI CZECH REPUBL,INST PHYS,CZ-16200 PRAGUE,CZECH REPUBLIC.
URI: http://hdl.handle.net/1942/3319
DOI: 10.1016/S0925-9635(97)00133-7
ISI #: A1997YB15800022
ISSN: 0925-9635
Type: Journal Contribution
Appears in Collections: Research publications

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