The interactions between metal and III-V compound semiconductors have
been under increasingly more intensive investigation since the early 1
980's. Over the years rather significant progress in understanding the
interactions has been made by various laboratories. In this discussio
n, we emphasize solid state reactions that are pertinent to the format
ion of non-spiking contacts to n- and p-type AlGaAs and GaAs, as well
as those that could induce compositional disordering in III-V superlat
tice structures. Examples are given to illustrate the diverse applicat
ion of simple reactions to microelectronics and optoelectronics.