Impact of molecular orientation on energy level alignment at C60/pentacene interfaces
| Autor: | Florian von Wrochem, Gabriele Nelles, Miki Kuribayashi, Shigetaka Tomiya, Shinnosuke Hattori, Hajime Kobayashi, Masato Kanno, Yasuyo Nishida, Toshio Nishi, Vadim Rodin |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Graphene business.industry 02 engineering and technology Substrate (electronics) Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Acceptor 0104 chemical sciences law.invention Pentacene chemistry.chemical_compound chemistry law Optoelectronics Vacuum level 0210 nano-technology Polarization (electrochemistry) business Ultraviolet photoelectron spectroscopy |
| Zdroj: | Applied Physics Letters. 113:163302 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.5051421 |
| Popis: | The molecular orientation and the electronic structure at molecular donor/acceptor interfaces play an important role in the performance of organic optoelectronic devices. Here, we show that graphene substrates can be used as templates for tuning the molecular orientation of pentacene (PEN), selectively driving the formation of either face-on or edge-on arrangements by controlling the temperature of the substrate during deposition. The electronic structure and morphology of the two resulting C60/PEN heterointerfaces were elucidated using ultraviolet photoelectron spectroscopy and atomic force microscopy, respectively. While the C60/PEN (edge-on) interface exhibited a vacuum level alignment, the C60/PEN (face-on) interface exhibited a vacuum level shift of 0.2 eV, which was attributed to the formation of an interface dipole that resulted from polarization at the C60/PEN boundary.The molecular orientation and the electronic structure at molecular donor/acceptor interfaces play an important role in the performance of organic optoelectronic devices. Here, we show that graphene substrates can be used as templates for tuning the molecular orientation of pentacene (PEN), selectively driving the formation of either face-on or edge-on arrangements by controlling the temperature of the substrate during deposition. The electronic structure and morphology of the two resulting C60/PEN heterointerfaces were elucidated using ultraviolet photoelectron spectroscopy and atomic force microscopy, respectively. While the C60/PEN (edge-on) interface exhibited a vacuum level alignment, the C60/PEN (face-on) interface exhibited a vacuum level shift of 0.2 eV, which was attributed to the formation of an interface dipole that resulted from polarization at the C60/PEN boundary. |
| Databáze: | OpenAIRE |
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