On the Feasibility of Observing Photoemission from Metal Contacts into Anthracene.
Abstract
This work completes the study of the two processes which can mask, partly or completely, photoemission from metal contacts into anthracene: carrier photoexcitation out of surface traps which are occupied under thermal equilibrium, and photoexcitation out of bulk traps which are continuously being filled by carrier injection from the contact under study. The first process is studied by photoconductivity measurements in the absence of contact effects. The photocurrents are shown to originate from hole photoexcitation out of surface traps. They are greatly influenced by surface treatments but even under the most optimal treatment the spectral yield is similar both in magnitude and threshold to yield curbes obtained by several workers and attributed to photoemission. For the second process, the arguments presented suggest that with contacts of alkali and alkaline-earth metals (electron injectors) and gold (Hole injector) the reported yield curves are probably associated with photo-enhanced space-charge-limited current. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1973
- Accession Number
- AD0768409
Entities
People
- A. Many
- J. Levinson
- Z. Burshtein
Organizations
- Hebrew University of Jerusalem