Evidence for Primal sp2 Defects at the Diamond Surface: Candidates for Electron Trapping and Noise Sources

Alastair Stacey, Nikolai Dontschuk, Jyh-Pin Chou, David A. Broadway, Alex K. Schenk, Michael J. Sear, Jean-Philippe Tetienne, Alon Hoffman, Steven Prawer, Chris I. Pakes, Anton Tadich, Nathalie P. de Leon, Adam Gali, Lloyd C. L. Hollenberg

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Many advanced applications of diamond materials are now being limited by unknown surface defects, including in the fields of high power/frequency electronics and quantum computing and quantum sensing. Of acute interest to diamond researchers worldwide is the loss of quantum coherence in near-surface nitrogen-vacancy (NV) centers and the generation of associated magnetic noise at the diamond surface. Here for the first time is presented the observation of a family of primal diamond surface defects, which is suggested as the leading cause of band-bending and Fermi-pinning phenomena in diamond devices. A combination of density functional theory and synchrotron-based X-ray absorption spectroscopy is used to show that these defects introduce low-lying electronic trap states. The effect of these states is modeled on band-bending into the diamond bulk and it is shown that the properties of the important NV defect centers are affected by these defects. Due to the paramount importance of near-surface NV center properties in a growing number of fields, the density of these defects is further quantified at the surface of a variety of differently-treated device surfaces, consistent with best-practice processing techniques in the literature. The identification and characterization of these defects has wide-ranging implications for diamond devices across many fields.
Original languageEnglish
JournalAdvanced Materials Interfaces
Volume6
Issue number3
DOIs
Publication statusPublished - 2019 Feb 8

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