EFFECTIVE WORK FUNCTION OF METAL CONTACTS TO VACUUM-CLEAVED PHOTOCONDUCTING CdS FOR HIGH PHOTOCURRENTS.
DELAWARE UNIV NEWARK DEPT OF PHYSICS
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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
- Solid State Physics