An infrared investigation of the 887 cm(-1) band in Cz-Si

We report on infrared studies of the 887 cm(-1) band arising in silicon, su bjected to neutron irradiation with subsequent thermal anneals. Deconvoluti on of this band indicates the presence of two peaks: a strong one at 887 cm (-1) and a weak one at 884 cm(-1). The 887 cm(-1) peak is, generally, attri buted to the VO2 defect. We have tentatively correlated the 884 cm(-1) peak to a [VO2 + V] defect structure. Theoretical calculations of the vibration al frequencies of the two defects support the above hypothesis. The new pic ture for the 887 cm(-1) band, could account for the exhibited uniaxial-stre ss behaviour. (C) 1999 Elsevier Science B.V. All rights reserved.