Dependence of the Properties of Epitaxial Gallium Arsenide on the Temperature of AsCl3

Abstract
The following varieties of electrical properties were obtained on the GaAs crystals grown epitaxially by using an open flow system of AsCl3-Ga-H2: (i) The carrier-concentration in the layers grown on Cr-doped semi-insulating substrates was varied from 2.5×1014 cm-3 to 2×1015 cm-3, while the temperature of AsCl3 varied from 20°C to 0°C, (ii) A high-resistance region at the epitaxial layer-(Sn-doped low-resistivity) substrate interface was observed when the temperature of AsCl3 was lowered prior to the epitaxial deposition, whereas a low-resistance region appeared while decreasing the temperature of AsCl3 during growth. Pyramid formation appeared on the epitaxial surface grown under higher temperature of AsCl3. It was eliminated by using a substrate cut five degrees off the (100) plane.