Low temperature Raman study on the site symmetry of ZnSe : P

摘要

Raman spectra of phosphorous doped ZnSe are recorded from 9 to 300 K. In addition to TO mode at 208 cm(-1) and LO mode at 253 cm(-1), a new mode around 240 cm(-1) is observed between 55 and 270 K. The spectra at lower and higher temperatures do not show the new mode. This new mode confirms that there is a reduction of (Se site) symmetry from T-d to C-3v when P substitutes for Se. This is due to Jahn Teller distortion. (c) 2006 Elsevier Ltd. All rights reserved.