Radiation Damage Effects on Optical, Electrical, and Thermophysical Properties of CVD Diamond Films

Хомич, А. А.; Хмельницкий, Р. А.; Hu, Xiaojun; Khomich, А.А.; Попович, А. Ф.; Власов, И. И.; Dravin, V. A.; Chen, Y. G.; Kar’kin, A. E.; Ralchenko, V.G.

doi:10.1007/s10812-013-9830-4

Cited by 16 publications

(12 citation statements)

References 33 publications

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“…A further increase in the neutron fluence (to 1 × 10 19 cm −2 and higher) leads to the disappearance of the diamond peak, notwithstanding that these fluences are two orders of magnitude below the critical dose of graphitization. In part, this is explained by the fact that the Raman cross-section in diamond is much lower than that in other allotropic forms of carbon [13,27].…”

Section: Raman Spectra Of Neutron-irradiated Diamondsmentioning

confidence: 99%

Probing the Nanostructure of Neutron-Irradiated Diamond Using Raman Spectroscopy

2020

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Disordering of crystal lattice induced by irradiation with fast neutrons and other high-energy particles is used for the deep modification of electrical and optical properties of diamonds via significant nanoscale restructuring and defects engineering. Raman spectroscopy was employed to investigate the nature of radiation damage below the critical graphitization level created when chemical vapor deposition and natural diamonds are irradiated by fast neutrons with fluencies from 1 × 1018 to 3 × 1020 cm−2 and annealed at the 100–1700 °C range. The significant changes in the diamond Raman spectra versus the neutron-irradiated conditions are associated with the formation of intrinsic irradiation-induced defects that do not completely destroy the crystalline feature but decrease the phonon coherence length as the neutron dose increases. It was shown that the Raman spectrum of radiation-damaged diamonds is determined by the phonon confinement effect and that the boson peak is present in the Raman spectra up to annealing at 800–1000 °C. Three groups of defect-induced bands (first group = 260, 495, and 730 cm−1; second group = 230, 500, 530, 685, and 760 cm–1; and third group = 335, 1390, 1415, and 1740 cm−1) were observed in Raman spectra of fast-neutron-irradiated diamonds.

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Section: Raman Spectra Of Neutron-irradiated Diamondsmentioning

confidence: 99%

Probing the Nanostructure of Neutron-Irradiated Diamond Using Raman Spectroscopy

2020

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“…This possible interpretation of the local mode peaks on the 580-nm ZPL phonon band was supported by the fact that HI9 centers were observed simultaneously with the characteristic features in Raman spectra 3 and 4 (Fig. 4) in diamonds irradiated with neutrons [17,39] or implanted with ions [39] at doses close to the graphitization level. Also, the band structure in the region of H19 center phonon repetitions allows other interpretations.…”

Section: Vacancy Defects In Covalent Crystals Loosen the Lattice Conversely Interstitial Defects Strengthen The Force Constants Of Vibratmentioning

confidence: 76%

“…Spectra of diamonds irradiated by neutrons and annealed at T a = 1680°C with strong PL lines at 580 nm changed shape at excitation beam (A, ex = 532 nm) powers from 0.1 to 20 mW. Also, several Raman bands characteristic of natural diamond and CVD diamond with extensive radiation damage were recorded in the short-wavelength part of the spectrum [17]. Their spectral positions changed in concert with the excitation wavelength ( The activation energy £ H 19 f°r the increase of integrated intensity /HI9 of an HI9 center (ZPL at 580 nm) of CVD diamond irradiated by neutron fluxes 2-10 19 and 2-10 20 cm" 2 relative to that of the diamond peak /R(Dia) in Raman spectra as a function of annealing temperature T a was £H19 = 1 -7 ± 0.1 eV (Fig.…”

mentioning

confidence: 97%

“…Six implantation areas (0.7 x 1.5 mm, dose from 2-10 16 to 1.2-10 17 cm" 2 ) separated by areas of undamaged diamond were formed on each plate of natural and CVD diamond. Another group of natural and CVD diamonds was irradiated in the water channel of an IVV-2M nuclear reactor in a fast neutron beam of ~ 10 14 cm" 2^"1 (neutron kinetic energy >0.1 MeV, flux from 2-10 19 to 2-10 20 cm" 2 ) [ 17]. Implanted (irradiated) samples were vacuum annealed in a graphite furnace (residual gas pressure 1 mPa) sequentially at T a = 200-1650°C (60 min at fixed temperature).…”

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confidence: 99%

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Photoluminescence Spectra of the 580-nm Center in Irradiated Diamonds

et al. 2019

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The formation mechanisms of the zero-phonon line optical center at 580 nm (H19 center) in photoluminescence spectra of irradiated natural diamonds and those deposited from the vapor phase were studied after their hightemperature vacuum annealing. The photoluminescence band intensity of the H19 center was shown to increase exponentially as the annealing temperature increased. Temperature dependences of photoluminescence spectra and local mechanical stress effects on the position and full width at half-height of the 580-nm zero-phonon line optical peak led to the conclusion that the H19 optical center was a complex intrinsic vacancy defect.

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“…Wide bands in the vicinity of 400 cm -1 and 1230 cm -1 and series of narrow lines in the area of 1400-1900 cm -1 refers to Raman scattering in diamond. Wide bands at 400 cm -1 and 1230 cm -1 were observed in Raman spectra of diamonds irradiated by ions [3,4,[24][25][26] and neutrons [26,27]. It is assumed that they are associated with amorphous sp 3 bonded carbon clusters along the ion tracks i.e.…”

Section: Resultsmentioning

confidence: 99%