Abstract
The ultraviolet photoemission spectroscopy (UPS) technique coupled with contact potential difference measurements was used to investigate the possibility of nonequilibrium conditions in doped organic molecular thin films. Zinc phthalocyanine (ZnPc) and N,Ń-diphenyl-N,ń-bis(1-naphthyl)-1, 1́biphenyl-4,4″ diamine (α-NPD) p-doped with the acceptor molecule were investigated as samples. An upward movement of the vacuum level away from the metal surface with respect to the Fermi level was observed. The results indicate towards the photovoltage being an unsignificant factor in these doped films, during UPS.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1488-1492 |
| Number of pages | 5 |
| Journal | Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films |
| Volume | 22 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jul 2004 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films