Accession Number : AD0890043

Title :   An Observation of Surface State Emission in the Energy Distribution of Electrons Field Emitted from Ge(100).

Descriptive Note : Technical rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS PHYSICAL ELECTRONICS LAB

Personal Author(s) : Shepherd, William B.

Report Date : OCT 1971

Pagination or Media Count : 133

Abstract : A discussion of the use of a differential energy analyzer for field emission energy distribution measurements is given. Data obtained from the central (100) facet of a clean, well-characterized Ge field emission tip is presented. Comparison of the measurements with theory is made, showing that the energy distributions originate from the valence band and an overlapping band of surface states. The total number of surface states is found to be 6.3 x 10 to the -12th power states/sq.cm. on the clean, annealed emitter. Adsorption of contamination from the vacuum system ambient or geometric alteration of the surface is seen to cause a reduction in the number of surface states. (Author)

Descriptors :   *FIELD EMISSION), (*SEMICONDUCTORS, SURFACE PROPERTIES), (*GERMANIUM, BAND THEORY OF SOLIDS, SPUTTERING, TUNGSTEN, ANNEALING.

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE