Difference between revisions of "Photoelectron Spectrometer XPS and UPS"
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We use high-vacuum surface electron spectroscopies: X-ray photoelectron spectroscopy and UV-photoelectron spectroscopy to provide the elemental, molecular and energetic information we require about these materials. | We use high-vacuum surface electron spectroscopies: X-ray photoelectron spectroscopy and UV-photoelectron spectroscopy to provide the elemental, molecular and energetic information we require about these materials. | ||
XPS uses high energy X-ray photons to excite “core” electrons in the near-surface region UPS uses lower energy photons in the deep UV region to excite valence electrons.[[Image:Surface_electron_spectroscopies.jpg]] | XPS uses high energy X-ray photons to excite “core” electrons in the near-surface region UPS uses lower energy photons in the deep UV region to excite valence electrons.[[Image:Surface_electron_spectroscopies.jpg|thumb||400px |]] | ||
Revision as of 12:49, 21 April 2009
What is the Problem? OLEDs and OPVs consist of thin films of organic materials, sandwiched between contacting electrodes. We need analytical tools which tell us:
- Elemental composition of metal, metal oxide and organic surfaces (top 1-10 nm)
- The molecular state of those elements in that same region
- The frontier orbital energies which control rates of charge transfer, photopotentials, onset voltages, etc.
What is our approach? We use high-vacuum surface electron spectroscopies: X-ray photoelectron spectroscopy and UV-photoelectron spectroscopy to provide the elemental, molecular and energetic information we require about these materials.
XPS uses high energy X-ray photons to excite “core” electrons in the near-surface region UPS uses lower energy photons in the deep UV region to excite valence electrons.
