Accession Number : AD0675333

Title :   PHOTO-ENHANCED EMISSION CURRENTS FROM ALKALI AND ALKALINE-EARTH METAL CONTACTS INTO ANTHRACENE.

Descriptive Note : Final technical rept. Jun 67-May 68,

Corporate Author : HEBREW UNIV JERUSALEM (ISRAEL)

Personal Author(s) : Many,A. ; Levinson,J. ; Teucher,I.

Report Date : JUN 1968

Pagination or Media Count : 33

Abstract : Dark- and photo-current measurements are used to study trap characteristics and optical de-trapping processes in anthracene samples provided with alkali and alkaline-earth metal contacts. The spectral response of the photocurrent yield in the entire photon-energy range studied (0.9 - 3.3 eV) originates from optical excitation of electrons from a single discrete set of traps which is filled by electron injection from the active metal contact. The traps are 0.95 eV deep and are present with a density of about 3x10 to the 13th power/cu cm. De-trapping appears to occur by direct photo-excitation into the conduction band at long wavelengths and by interaction of occupied traps with triplet and singlet excitons at shorter wavelengths. The spectral yield curve exhibits considerable structure which can be advantageously used to study the various electronic-vibronic states in anthracene. (Author)

Descriptors :   (*ANTHRACENES, *PHOTOELECTRIC EFFECT), ELECTRODES, ALKALI METALS, ALKALINE EARTH METALS, PHOTONS, PHONONS, EXCITONS, BAND THEORY OF SOLIDS, SPECTROSCOPY, ISRAEL

Subject Categories : Radiation and Nuclear Chemistry
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE