Composition Dependence of Raman Bands in Amorphous As_xSe_100−x

Abstract

Raman scattering spectra are studied for Se-rich amorphous semiconductors As-Se. By comparing peak width, peak position, and Raman intensity in the range of bond modes it is derived that the changes occur not monotonically with increasing As content. The change of the spectra is explained as due to cross linking Se chains.

Thermal transport and grain boundary conductance in ultrananocrystalline diamond thin films

“…The former is attributed to As-Se-As stretching vibration in the AsSe 3 pyramids and the latter to As-S-As in AsS 3 pyramids. 18,23,73,[76][77][78][79][80][81][82][83][84][85][86] The relative intensity change of these two broad bands ͑shown in Fig. 2͒ is consistent with the change of the relative ratio of Se/ S in these glasses.…”

Structural, dynamic, electronic, and vibrational properties of flexible, intermediate, and stressed rigid As-Se glasses and liquids from first principles molecular dynamics

“…Support for the pyramidal local structure in glasses and liquids have been obtained from neutron, [12][13][14][15][16][17][18] X-ray diffraction, [19][20][21][22][23][24] extended absorption x-ray diffraction [25][26][27][28][29] (EXAFS), anomalous X-ray scattering, 30,31 and Nuclear Magnetic Resonance (NMR). [32][33][34][35] In addition, Raman spectroscopy, [36][37][38][39][40][41][42][43][44][45][46] infrared absorbance 9,37,40,[47][48][49] have shown that the spectrum of elemental Se which consists of several modes typical of Se-Se bond vibrations is affected as the As content is changed. New peaks associated with the formation of pyramidal AsSe 3/2 units appear, and these seem to indicate that the addition of As proceeds in a stochastic fashion for compositions lower than 15%, whereas a non-stochastic addition sets in for larger As content.…”

Selective light-induced mass transport in amorphous As x Se 100−x films driven by the composition tuning: Effect of temperature on maximum acceleration

“…It is also obvious that the existing methods of structural studies (e.g. micro-Raman studies) do not reveal significant differences between As4Se96 and As5Se95 compounds [31].…”