CRYSTAL-GROWTH OF CDTE ALLOYED WITH ZN, SE AND S

Single crystals of CdTe-based quaternary alloys are grown by a vertica l Bridgman method. The lattice constant of the quaternary ingot is pro posed to match that of Cd0.8Zn0.2Te. To compensate the Zn segregation in CdTe, a suitable amount of Se or S was added along with Zn. We foun d that the compensate effect was not significant, particularly for the CdZnTeS alloy. Nevertheless, an ingot with a fairly uniform lattice c onstant was obtained for the CdZnTeSe alloy mainly because the effecti ve segregation coefficient of Se was close to one. A study using doubl e crystal X-ray diffractometry indicated that the addition of Se or S to CdZnTe would degrade the crystal quality. (C) 1997 Elsevier Science S.A.