Electronic structures of organic/organic heterojunctions: From vacuum level alignment to Fermi level pinning
- 15 March 2007
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 101 (6)
- https://doi.org/10.1063/1.2710297
Abstract
Electronic structures of organic/organic (O/O) heterojunctions have been studied by photoemission spectroscopy. We showed that vacuum level alignment is only valid for certain O/O heterojunctions rather than a general rule for organic junctions. The mode of energy level alignment is found to depend on the Fermi level position in the organic energy gap. In general, when the Fermi level is near the midgap position, vacuum level alignment at the O/O heterojunction is observed, whereas when the Fermi level is close to the edge of the lowest unoccupied or highest occupied molecular orbital level, Fermi level pinning accompanied by molecular orbital level bending is observed at the O/O heterojunction.This publication has 23 references indexed in Scilit:
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