First evidence for vibrational excitations of large atomic clusters in amorphous semiconductors
Contributors: Robert J. Nemanich, S.A. Solin, and G. Lucovsky
ABSTRACT
Raman and depolarization spectra of GeSe2 alloyed with Se or As2Se reveal a sharp vibrational doublet, only one component of which can be attributed to a vibrational excitation of the GeSe2 local atomic cluster. The composition dependence of the intensity and polarization of the second feature identify it as an excitation involving a substantially larger cluster with high symmetry. The large cluster is a ring of Ge atoms inter-connected through single Se atoms