EFFECT OF SULFUR DOPING ON OPTICAL ANISOTROPY OF CDSIAS2

Polarization dependent photoluminescence and photocurrent measurements were carried out on undoped and sulfur doped single crystals of CdSiA s2. For undoped crystal the interband transition A shows a 40 meV blue shift under perpendicular light polarization with respect to the paral lel one. This shift is about twice as large for sulfur doped crystal. A pronounced photoabsorption band at 1.53 eV, related to the sulfur do nor, is observed in the low temperature photocurrent spectrum. A signi ficant enhancement of the optical anisotropy of donor-acceptor transit ion is seen in the low temperature photoluminescence spectra of CdSiAs 2 doped with sulfur. (C) 1996 American Institute of Physics.