Photoemission spectroscopy of LiF coated Al and Pt electrodes

Autor:	Bruce A. Parkinson, Neal R. Armstrong, Nasser Peyghambarian, Ghassan E. Jabbour, Kenneth W. Nebesny, Paul A. Lee, Bernard Kippelen, Rudy Schlaf
Rok vydání:	1998
Předmět:	chemistry.chemical_compound Band bending Materials science chemistry X-ray photoelectron spectroscopy Photoemission spectroscopy Electrode Analytical chemistry General Physics and Astronomy Lithium fluoride Work function Heterojunction Overlayer
Zdroj:	Journal of Applied Physics. 84:6729-6736
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.369000
Popis:	Thin lithium fluoride (LiF) interlayers between the low work function electrode and the electron transport layer in organic light emitting diodes (OLED) result in improved device performance. We investigated the electronic structure of LiF coated Al and Pt electrodes by x-ray photoemission spectroscopy (XPS) and ultraviolet photoemission spectroscopy (UPS). Thin LiF films were grown in several steps onto Ar+ sputtered Al and Pt foils. After each growth step the surfaces were characterized in situ by XPS and UPS measurements. After evaluating band bending, work function and valence band offset for both samples, their band lineups were determined. Our measurements indicate that despite the insulating character of LiF in both samples, band bending is present in the LiF layer. The difference in band bending between the samples allows the conclusion that the driving force for the development of the band bending results from the contact potential between the metal and the LiF overlayer. The band bending is most...
Databáze:	OpenAIRE
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