Strong modification of the transport level alignment in organic materials after optical excitation
| Autor: | Mirko Cinchetti, Dominik Jungkenn, Norman Haag, Steffen Eich, Benjamin Stadtmüller, Martin Aeschlimann, Sebastian Emmerich, Stefan Mathias, M. Maniraj, Markus Rollinger |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Fullerene optoelectronic devices organic materials optical excitation Exciton Science General Physics and Astronomy 02 engineering and technology General Biochemistry Genetics and Molecular Biology Article 03 medical and health sciences Condensed Matter::Materials Science Molecule Thin film lcsh:Science Multidisciplinary business.industry Photovoltaic system General Chemistry 021001 nanoscience & nanotechnology Organic semiconductor 030104 developmental biology Optoelectronics lcsh:Q 0210 nano-technology business Ultrashort pulse Excitation |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-9 (2019) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Organic photovoltaic devices operate by absorbing light and generating current. These two processes are governed by the optical and transport properties of the organic semiconductor. Despite their common microscopic origin—the electronic structure—disclosing their dynamical interplay is far from trivial. Here we address this issue by time-resolved photoemission to directly investigate the correlation between the optical and transport response in organic materials. We reveal that optical generation of non-interacting excitons in a fullerene film results in a substantial redistribution of all transport levels (within 0.4 eV) of the non-excited molecules. As all observed dynamics evolve on identical timescales, we conclude that optical and transport properties are completely interlinked. This finding paves the way for developing novel concepts for transport level engineering on ultrafast time scales that could lead to novel functional optoelectronic devices. Correlating the optoelectronic properties in organic semiconductors is vital to realizing devices with high performance and new functionalities. Here, the authors report the role of optically excited charge transfer excitons on energy level alignment of the transport levels in organic thin films. |
| Databáze: | OpenAIRE |
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