HOMO/LUMO Alignment at PTCDA/ZnPc and PTCDA/ClInPc Heterointerfaces Determined by Combined UPS and XPS Measurements

Autor:	Bruce A. Parkinson, Rudy Schlaf, Kenneth W. Nebesny, Paul A. Lee, Neal R. Armstrong
Rok vydání:	1999
Předmět:	Chemistry Analytical chemistry Heterojunction Electronic structure Surfaces Coatings and Films chemistry.chemical_compound Band bending X-ray photoelectron spectroscopy Materials Chemistry Phthalocyanine Molecular orbital Physical and Theoretical Chemistry Thin film HOMO/LUMO
Zdroj:	The Journal of Physical Chemistry B. 103:2984-2992
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp982834y
Popis:	The offsets between the highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO) at the 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)/chloroindium phthalocyanine (ClInPc) and PTCDA/zinc phthalocyanine (ZnPc) organic heterojunctions were estimated from a combination of X-ray and ultraviolet photoemission (XPS,UPS) measurements. This combined method allows an improved determination of the electronic structure of such organic/organic‘ interfaces due to the separate determination of the band bending (charge redistribution) following heterojunction formation. Both interfaces have large offsets in the onset for photoemission from their HOMO levels (PTCDA/ZnPc: 0.88 eV; PTCDA/CnlInPc: 0.93 eV). Using thin film absorbance data, the corresponding offsets in LUMO levels were estimated to be 0.66 eV (PTCDA/ZnPc) and 0.34 (PTCDA/ClInPc). The ZnPc/PTCDA interface showed a significant interface dipole (0.25 eV) while the ClInPc/PTCDA contact was essentially dipole free.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fe2c63e3b1b6c331bdf212d9ba042200 https://doi.org/10.1021/jp982834y Zobrazit plný text záznamu