A double-layered encapsulant for annealing ion-implanted GaAs up to 1100 °C

Abstract
A double‐layered encapsulation consisting of a 1000‐Å plasma‐deposited Si3N4 layer under a 3000‐Å CVD SiO2 layer doped with arsenic has been used to anneal selenium ion‐implanted GaAs at temperatures up to 1100 °C with no signs of mechanical failure when examined with a scanning electron microscope. Significant improvement in electrical activation of implanted layers over simple Si3N4 layer caps has also been observed at lower temperatures.

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