Physics

Research on solid state physics described by scientists at Kemerovo State University

  2009 NOV 17 - (VerticalNews.com) -- "The phonon spectra and densities of states of AgInSe2 and AgInTe2 semiconductor crystals with a chalcopyrite structure have been calculated from first principles by the linear response method. The frequencies calculated at the center of the Brillouin zone are in agreement with the experimental data obtained using IR and Raman spectroscopy," researchers in Russia report.

  "According to the atomic contributions to the vibrational modes, the spectra of the AgInSe2 and AgInTe2 crystals exhibit three groups of bands: the vibrations in the low- and medium-frequency ranges are mixed in character with approximately identical contributions of all sublattices, and the bands at higher frequencies are associated with the contributions of Ag, C-VI and In, C-VI (C-VI = Se, Te) atoms. The position of these bands allows us to make the inference that, in the crystals under investigation, the In," wrote A.V. Kopytov and colleagues, Kemerovo State University.

  The researchers concluded: "CVI bonding is stronger than the Ag-C-VI bonding."

  Kopytov and colleagues published their study in Physics of the Solid State (Ab Initio Calculations of the Vibrational Spectra of AgInSe2 and AgInTe2. Physics of the Solid State, 2009;51(10):2115-2120).

  For additional information, contact A.V. Kopytov, Kemerovo State University, Ul Krasnaya 6, Kemerovo 650043, Russia.

  Publisher contact information for the journal Physics of the Solid State is: Maik Nauka, Interperiodica, Springer, 233 Spring St., New York, NY 10013-1578, USA.

  Keywords: Electronics, Semiconductor, Physics, Kemerovo State University.

  This article was prepared by VerticalNews Physics editors from staff and other reports. Copyright 2009, VerticalNews Physics via VerticalNews.com.