ELECTRONIC EFFECTS OF SODIUM IN EPITAXIAL CUIN1-XGAXSE2

Temperature dependent Hall effect measurements were made on Na-contami nated and uncontaminated epitaxial p-type CuIn1-xGaxSe2 films. Na was introduced by diffusion into as-deposited samples using both NaOH and Na2Se as sources. Na concentrations were measured using secondary ion mass spectroscopy by comparison to an implanted standard, Films contam inated with Na from either source were found to have much lower compen sating donor densities than as-deposited films, Oxygen and other impur ities were not found to be necessary to produce this effect although s ome changes with Se content were observed. These were independent of t he Na effect. (C) 1997 American Institute of Physics.