Energy-level alignment at metal-organic and organic-organic interfaces
| Autor: | Sjoerd Veenstra, Harry T. Jonkman |
|---|---|
| Přispěvatelé: | Zernike Institute for Advanced Materials |
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
BUCKMINSTERFULLERENE
Materials science Polymers and Plastics Band gap BAND-GAP Electronic structure FILMS Polymer solar cell interfaces Polymer chemistry ULTRAVIOLET PHOTOELECTRON-SPECTROSCOPY Materials Chemistry conjugated polymers SOLID C-60 Physical and Theoretical Chemistry oligomers LIGHT-EMITTING DEVICES Diode PHOTOINDUCED ELECTRON-TRANSFER business.industry SURFACES charge transfer fullerenes POLYMER Condensed Matter Physics Indium tin oxide Organic semiconductor INDIUM-TIN-OXIDE Optoelectronics Vacuum level business Ultraviolet photoelectron spectroscopy |
| Zdroj: | Journal of Polymer Science. Part B: Polymer Physics, 41(21), 2549-2560. Wiley-Blackwell |
| ISSN: | 1099-0488 0887-6266 |
| Popis: | This article reports on the electronic structure at interfaces found in organic semiconductor devices. The studied organic materials are C60 and poly (para-phenylenevinylene) (PPV)-like oligomers, and the metals are polycrystalline Au and Ag. To measure the energy levels at these interfaces, ultraviolet photoelectron spectroscopy has been used. It is shown how the energy levels at interfaces deviate from the bulk. Furthermore, it is demonstrated that the vacuum levels do not align at the studied interfaces. The misalignment is caused by an electric field at the interface. Several effects are presented that influence the energy alignment at interfaces, such as screening effects, dipole layer formation, charge transfer, and chemical interaction. The combination of interfaces investigated here is similar to interfaces found in polymer light-emitting diodes and organic bulk heterojunction photovoltaic devices. The result, the misalignment of the vacuum levels, is expected to influence charge-transfer processes across these interfaces, possibly affecting the electrical characteristics of organic semiconductor devices that contain similar interfaces. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 2549–2560, 2003 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text