Vertical gradient freezing (VGF) growth of Hg1-xCdxTe (x=0.19) was studied. Porosity can be eliminated by adjusting temperature program of growth. As expected, subgrain boundaries and etch pit densities can be reduced...Vertical gradient freezing (VGF) growth of Hg1-xCdxTe (x=0.19) was studied. Porosity can be eliminated by adjusting temperature program of growth. As expected, subgrain boundaries and etch pit densities can be reduced considerably if low temperature gradient is used.展开更多
In CdZnTe crystal growth by vertical gradient freezing (VGF) method the porosity control, preventing the inner-wall carbon coating from breakdown and preventing backdiffusion from the melt were studied. The porosity c...In CdZnTe crystal growth by vertical gradient freezing (VGF) method the porosity control, preventing the inner-wall carbon coating from breakdown and preventing backdiffusion from the melt were studied. The porosity can be eliminated by maintaining a proper temperature gradient at the solid/liquid interface during growth. High vapor pressure in the growth chamber sometimes causes expansion of the quartz ampoule and thus breakdown of the inner-wall carbon coating. Backdiffusion can be controlled by reducing the opening size of the reservoir and the volume of the ampoule's free space.展开更多
文摘Vertical gradient freezing (VGF) growth of Hg1-xCdxTe (x=0.19) was studied. Porosity can be eliminated by adjusting temperature program of growth. As expected, subgrain boundaries and etch pit densities can be reduced considerably if low temperature gradient is used.
文摘In CdZnTe crystal growth by vertical gradient freezing (VGF) method the porosity control, preventing the inner-wall carbon coating from breakdown and preventing backdiffusion from the melt were studied. The porosity can be eliminated by maintaining a proper temperature gradient at the solid/liquid interface during growth. High vapor pressure in the growth chamber sometimes causes expansion of the quartz ampoule and thus breakdown of the inner-wall carbon coating. Backdiffusion can be controlled by reducing the opening size of the reservoir and the volume of the ampoule's free space.
