Properties of Cleaned Germanium Surfaces

Field effect and conductivity measurements were made on cleaned (111) and (100) germanium surfaces. The surfaces were cleaned by an argon bombardment technique similar to that developed by Farnsworth. The cleaned surfaces were exposed to a modified Brattain-Bardeen ambient cycle and the change in surface properties measured. The cleaned surface data showed that a (100) surface is more highly $p$ type than a (111) surface, and these results are interpreted qualitatively by an atomistic model.