Electrical, optical, and mechanical properties of amorphous hydrogenated carbon obtained under various deposition conditions

Visible Raman spectroscopy of carbon films synthesized by ion-plasma sputtering of graphite

“…18 Additional information about the structure using method of visible Raman spectroscopy can be obtained by applying the excitation with energy approximately equal to the energy gap in the local sp 2 C sites, and which is about 2 eV. 14 Figure 4 shows the Raman spectra for excitation at 633 nm (1.96 eV). In case of films synthesized at 250°C, one can observe the emergence of one broad band with two maxima.…”

“…The distribution of density of allowed electronic states, formed by r-and p-bonds, will determine the value of energy gap. 16 There are various determination methods of sp n bond hybridization, such as nuclear magnetic resonance, electron energy loss spectroscopy (EELS), x-ray photoelectron spectroscopy, 12,14,16,17 but these are time-consuming and destructive methods. Therefore, more and more researchers pay attention to the method of Raman spectroscopy.…”

“…7,8 The interest of no small importance is attracted by such structures as amorphous carbon (a-C), tetragonal amorphous carbon (ta-C) and others. [9][10][11][12][13][14][15] Production of various forms and molecular structures of carbon depends on the conditions and methods of their synthesis. Structural modification of carbon films is defined by different ratios of sp 1 , sp 2 and sp 3 hybridized bonding.…”

“…Raman spectroscopy method with laser excitation in the visible region does not lead to destruction of the structure; it is considered as an important tool in the evaluation of sp 3 sites, and it also gives the opportunity to explore and identify the molecular structure of the synthesized film. 12, [14][15][16][17][18][19] Method of magnetron ion-plasma sputtering is widely used in industry for the synthesis of thin films. This method is useful in the production of modified structures with impurities or nanoclusters of different chemical natures.…”

Amorphous Hydrogenated Carbon Films with Diamond-Like and Polymer-Like Properties

“…Ellipsometric studies have shown that the a-C:H films can have a high refractive index and transparent in the UV-visible range in [16,17]. The dependences of the optical constants of a-C:H films on the parameters of the condensation process have been established by ellipsometry in [18][19][20][21]. The optical constants for the wavelength of 632.8 nm of the a-C:H films obtained by the method described above were determined using LEF-3M ellipsometer (Russia) [21].…”