Optical and electrical properties of vapour phase grown Zn1−xCrxTe crystals

The optical and electrical properties of vapour phase grown crystals of diluted magnetic semiconductor Zn 1 − x Cr x Te were investigated for 0 ≤ x ≤ 0.005. The diffuse reflectance spectra exhibited an increase in the fundamental absorption edge ( E 0 ) with composition x and were also dominated by a broad absorption band around 5200 cm − 1 arising from 5 T 2 → 5 E transition. The 5 T 2 and 5 E levels originate from the crystal field splitting of the 5 D free ion in the ground state. The electrical resistivity measurements revealed semiconducting behaviour of the samples with p-type conductivity in the temperature range of 200–450 K.