Low-lying valence band states and intrinsic photoconductivity in crystalline anthracene and tetracene

N. Geacintov, M. Pope

Research output: Contribution to journalArticlepeer-review

Abstract

The wavelength dependence of the intrinsic photoconductivity of anthracene and tetracene single crystals has been measured with photon energies up to 6.5 eV. Both materials exhibit three peaks or shoulders in the 3.0-6.5-eV range. The photoconductivity spectra are interpreted by comparing them to the kinetic energy distributions of external photoemitted electrons. The energy sequence of the photoconductivity peaks is in good agreement with characteristic energy losses suffered by the externally emitted photoelectrons. The decreases in the photocurrent, as the photon energy is increased, are shown to arise at energies at which transitions from lower-lying valence states set in. When transitions from lower-lying valence states are involved, the energy of the final state may be below the photoconductivity threshold energy and the current decreases. The energy sequences of the valence states are compared to theoretical HMO and extended-Hückel-method calculations. Finally, the absorption spectra of these crystals are related to the photoconductivity action spectra.

Original languageEnglish (US)
Pages (from-to)627-631
Number of pages5
JournalThe Journal of Chemical Physics
Volume50
Issue number2
DOIs
StatePublished - 1969

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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