/correlation studies of pits, hall effect and van der pauw CHARACTERIZATIONS OF GaAs SUBSTRATES J by MQHELE E. H. DLODLO B.S.E.E., Geneva College, 1980 Beaver Falls, PA, U. S. A. A MASTER'S THESIS submitted in partial fulfillment of the requirements for the degree MASTER OF SCIENCE Department of Electrical and Computer Engineering KANSAS STATE UNIVERSITY Manhattan, Kansas 1989 Approved by: Ma] pox