Abstract
Large, partly faceted ZnSe single crystals have been grown in the closed tube system by the unseeded sublimation travelling heater method (STHM) at 1100°C and undercooling Δ T less than 10°C. As-grown crystals are highly transparent and have very good optical homogeneity by sight. High quality of the crystals was confirmed by double crystal X-ray diffraction which showed the full-width at half-maximum (FWHM) of the rocking curves to be less than 20 arcsec on the (2 2 0) ZnSe diffraction planes of the crystals. Selective chemical etching showed a dislocation density of these faces to be less than 5×10 4 cm −2. The room-temperature photoluminescence (PL) spectrum under pulse excitation consists of only one near-band-edge line. Free and bound exciton as well as donor–acceptor pair recombination are observable at 13 K.
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