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Investigations of the co-doping of boron and lithium into CVD diamond thin films

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)115-122
Number of pages8
JournalDiamond and Related Materials
Volume76
Early online date3 May 2017
DOIs
DateAccepted/In press - 2 May 2017
DateE-pub ahead of print - 3 May 2017
DatePublished (current) - Jun 2017

Abstract

Lithium has been incorporated into heavily boron-doped single-crystal (SCD), microcrystalline (MCD) and nanocrystalline diamond (NCD) films at concentrations up to ~2 × 1020 cm-3 using Li3N as a solid-state Li source for in-diffusion and diborane as the B source. The quality, morphology, electrical resistance and concentration of B and Li dopants present in a range of B+Li co-doped SCD, MCD and NCD films have been studied. Analysis of the SIMS depth profiles for Li enabled the diffusion constants, D, to be measured (in units of cm2 s-1) as: 2.5 × 10-15, 1.3 × 10-14 and 7.0 × 10-14 for SCD, MCD and NCD, respectively, at 1100 K. The value for D for SCD agrees closely with that in the literature, while the much larger values for the polycrystalline films provide direct evidence that Li can diffuse rapidly along or through diamond grain boundaries at elevated temperatures. If prolonged diffusion allows the Li to reach the Si substrate, the Si acts as a sink for Li absorbing large quantities and reducing its concentration in the diamond film.

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