THERMODYNAMIC ANALYSIS OF THE VAPOR GROWTH OF ZN1-XCDXSE SINGLE-CRYSTALS

The growth of Zn1-xCdxSe single crystals by hydride chemical transport and by physical transport in a helium atmosphere was analyzed thermod ynamically for a geometry in which nutrient species (sublimates of ZnS e and CdSe) are placed into separate source chambers and delivered thr ough calibrated outlets to the growth zone containing a single-crystal seed. Three principal steps of the process were considered: evaporati on of nutrient components in the source chambers, transport of vapor s pecies to the growth zone, and deposition of the constituents componen ts on the seed. Transport from the source to the growth zone was assum ed to be the limiting step, with the rate determined by the source-zon e geometry. The compositions of Zn1-xCdxSe single crystals grown in th is geometry agreed well with the calculated values.