Accession Number : AD0634032

Title :   THE INFLUENCE OF OXYGEN IN THE ULTRAHIGH VACUUM RANGE ON ELECTRICAL PROPERTIES OF CDS.

Descriptive Note : Technical rept.,

Corporate Author : DELAWARE UNIV NEWARK DEPT OF PHYSICS

Personal Author(s) : Boer,Karl W. ; Schubert,R.

Report Date : MAY 1966

Pagination or Media Count : 17

Abstract : Undoped CdS single crystals are kept in a vacuo of p < 10 to the -9th power torr. Adsorption of different gases (O2, H, CO2) was allowed by backfilling the system up to a pressure in the 0.00001 torr range through a sensitive leak valve; crystal conductance is monitored simultaneously. Changes of the photocurrent up to 0.000003 amperes and sensitivity to changes in the partial pressure of oxygen as small as 10 to the -10th power torr are reported for different temperatures. Gases are desorbed by a time linear increase of temperature from 80K to 600;K. The desorption is monitored with a mass spectrometer locked in the investigated mass number. Simultaneous changes of electrical properties are studied using TSC curves. Consequent desorption show, in general, more than one desorption peak, indicating multisite adsorption. (Author)

Descriptors :   (*CADMIUM COMPOUNDS, SULFIDES), (*SULFIDES, ELECTRICAL PROPERTIES), SINGLE CRYSTALS, ADSORPTION, OXYGEN, HYDROGEN, CARBON DIOXIDE, VACUUM, TEMPERATURE, PHOTOCONDUCTIVITY, MASS SPECTRA, PRESSURE, SEMICONDUCTORS

Subject Categories : Crystallography
      Electricity and Magnetism
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE