Ge-doped p-type epitaxial GaAs for microwave device application

Abstract
GaAs p‐n junctions were grown by liquid‐phase epitaxy using Ge as the acceptor and Sn as the donor. Abrupt junctions with well‐controlled carrier concentrations in both the n and the p layers were produced. High‐quality varactors and double‐drift GaAs IMPATT diodes were fabricated. cw output power of 3.0 W with 15.8% efficiency at 8.9 GHz and pulse output power of 4.1 W with 20.7% efficiency at 10.56 GHz were observed.