The authors have developed a low-temperature Pd bonding technique for
integrating InP structures onto GaAs substrates. The solid phase react
ions of Pd with both InP and GaAs allows Pd to be used as a sandwiched
ohmic contact between two dissimilar materials. The InP-Pd-GaAs inter
faces have been characterised by scanning electron microscopy, optical
reflectance, and electrical transport measurement.