Photoinduced Volume Changes of Obliquely and Flatly Deposited Amorphous AsSe Films Universal Description of the Kinetics

Lukács, Rozália; Kugler, S.

doi:10.7567/jjap.50.091401

Cited by 4 publications

(1 citation statement)

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“…Due to their remarkable transparency in the infrared domain and their ability to be deposited in thin-film form, chalcogenide materials are of great interest for optoelectronic and computer science applications [1][2][3]. Some chalcogenide systems are classically studied, such as As-S [4,5], As-Se [6,7], or Ge-As-Se [8,9], although their transmission domain is limited in the long infrared wavelengths. Telluride materials have received an increased attention in the last years because this transmission domain can be extended up to 20 μm [10][11][12], and as some applications require microcomponents being able to work in an extended infrared domain such as spatial interferometry [13], biosensing, or environmental metrology [14], different Te-based systems have become particularly attractive, such as Te-Ge-I [1], Ge-As-Se-Te [15], Te-As-Se [16], or Ge-Ga-Te [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of concentration in Ge-Te liquids: A combined density functional and neutron scattering study

et al. 2014

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International audienceThe structural properties of three compositions of Ge-Te liquids (Ge10Te90,Ge15Te85,Ge20Te80) are studied from a combination of density functional based molecular dynamics simulations and neutron scattering experiments. We investigate structural properties including structure factors, pair distribution functions, angular distributions, coordination numbers, neighbor distributions and compare our results with experimental findings. Most noticeable is the good agreement found in the reproduction of the structure in real and reciprocal space, resulting from the incorporation of dispersion forces in the simulation. This leads to Ge and Te coordination numbers which are lower than in previous studies and which can now be followed with temperature, while also strongly depending on the chosen cutoff distance. Results show a gradual conversion of higher coordinated species (TeIV, GeV) into lower coordinated ones at lower temperature, while leaving anticipated coordinations from the octet rule (TeII and GeIV) nearly unchanged. Structural correlations are characterized as a function of temperature and composition. The vibrational density of states is also measured from inelastic neutron scattering for different compositions and temperatures, and compared to the simulated counterpart which exhibits a reasonable agreement at low frequency

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