Accession Number : AD0697002

Title :   EFFECTIVE WORK FUNCTION OF METAL CONTACTS TO VACUUM-CLEAVED PHOTOCONDUCTING CdS FOR HIGH PHOTOCURRENTS.

Descriptive Note : Technical rept.,

Corporate Author : DELAWARE UNIV NEWARK DEPT OF PHYSICS

Personal Author(s) : Stirn,Richard J. ; Boer,Karl W.

Report Date : NOV 1969

Pagination or Media Count : 14

Abstract : Stationary cathode-adjacent high-field domains which occur in a range of negative differential conductivity have been used to determine the electron density at the cathode for various metals deposited on vacuum-cleaved photoconducting CdS. Measurements were taken in bandgap light at various intensities and at temperatures ranging from 155 to 300 degrees K. These crystals (doped with Ag and Al) consistently have gains greater than 10 even with metal contacts of Au or Pt. The analysis shows that the 'effective barrier heights' are essentially independent of the metal work function, are dependent on the light intensity and temperature, and are generally lower in magnitude by about 40% as compared to values obtained from photoresponse measurements on CdS with negligible photocurrent. (Author)

Descriptors :   (*CADMIUM SULFIDES, NEGATIVE RESISTANCE CIRCUITS), (*ELECTRIC TERMINALS, WORK FUNCTIONS), ELECTRON DENSITY, CARRIERS(SEMICONDUCTORS), PHOTOCONDUCTIVITY, LOW TEMPERATURE

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE