15-18 March 2021
DESY
Europe/Berlin timezone

Surface modifications of ion- irradiated diamonds

16 Mar 2021, 11:15
20m
https://desy.zoom.us/j/95636973549

https://desy.zoom.us/j/95636973549

Oral contribution Disordered Materials, complex crystal structures and aperiodic crystals, diffuse scattering and 3D-PDF Disordered Materials, complex crystal structures and aperiodic crystals, diffuse scattering and 3D-PDF

Speaker

Katja Bunk (Goethe University Frankfurt)

Description

Ion- irradiation is an established technology to change properties of diamonds in a controlled way [1] and has been studied as a function of ion species, energy and fluence for many years [2-4]. However, little is known regarding surface effects for irradiations with high energy ions which penetrate deep into the diamond. Irradiation experiments were carried out on various synthetic diamond samples using 14 MeV Au6+ ions and a maximal fluence of 2.4 ×1015 ions/cm2. The penetration depth of such ions in diamond is about 1.7 μm [5]. The surface of the samples was characterized by atomic force microscopy (AFM), Raman spectroscopy and X-ray reflectometry (XRR).
Due to the irradiation, the formerly transparent samples darkened, which suggests partial amorphisation of the material. Raman spectroscopy revealed significant changes in the lattice dynamics and the formation of sp3 bonded amorphous carbon (Fig. 1). XRR experiments performed at beamline P08 @ PETRA III (Hamburg, Germany) revealed the formation of modified layers near the sample surface (Fig. 2). AFM provided information on changes of the surface topography including increased roughness and swelling. The surface roughness deduced from XRR data compared to AFM results will be discussed for the different diamond materials.

Fig. 1: Raman spectra of pristine (black lines) and irradiated (colored lines) diamonds for a single crystal diamond sample irradiated with 14 MeV Au-ions of different fluences.

Fig. 2: XRR curves for the experimental (black lines) and calculated (red lines) data of a single crystal diamond sample irradiated with 14 MeV Au-ions of fluence 2.4 × 1015 ions/cm2.

References:
[1] R. Kalish, Semiconductors and Semimetals, 76, (2003), 145–181.
[2] R. Kalish and S. Prawer, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 106, (1995), 429.
[3] J. F. Prins, Materials Science Reports 7, (1992), 275.
[4] B. A. Fairchild, S. Rubanov, D. W. Lau, M. Robinson, I. Suarez-Martinez, N. Marks, A. D. Greentree, D. McCulloch, and S. Prawer, Advanced Materials 24, (2012), 2024.
[5] J. F. Ziegler, M. D. Ziegler, and J. P. Biersack, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 268, (2010), 1818-1823.

Primary author

Katja Bunk (Goethe University Frankfurt)

Co-authors

Dr Wolfgang Morgenroth (University of Potsdam) Dr Igor Alencar (Federal University of Santa Catarina) Dr Florian Bertram (Deutsche Elektronen Synchrotron (DESY) (FS-PET-D Fachgruppe P08)) Dr Christian Schmidt (GFZ German Research Center for Geosciences) Peter Gruszka (Goethe University Frankfurt) Prof. Christina Trautmann (GSI Helmholtz Centre for Heavy Ion Research and Technical University of Darmstadt ) Prof. Björn Winkler (Goethe University Frankfurt)

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