GROWTH OF ZNSE CRYSTALS BY NONSTOICHIOMETRIC ANNEALING

The grain growth of polycrystalline ZnSe by nonstoichiometric annealing has been studied. It has been found that grains grew from 10 μm to 10 mm in diameter by annealing in selenium atmosphere for two weeks at 1000°C, while samples annealed under a zinc ambient grew up to 2 mm. The color of the crystals changed markedly; the selenium annealed sample became pure green, whereas those annealed under a zinc ambient remained yellow. The residual impurity concentrations in the annealed samples have been found to be less than those in boules obtained by other techniques. © 1990.