| Autor: |
Schultz, T., Bärmann, P., Longhi, E., Meena, R., Geerts, Y., Gogotsi, Y., Barlow, S., Marder, S., Petit, T., Koch, N. |
| Rok vydání: |
2023 |
| Předmět: |
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| Popis: |
Two dimensional MXenes, with Ti3C2Tx being the most prominent member, show properties that make them promising for a manifold of applications, including electrodes in light emitting diodes, solar cells, and field effect transistors based on organic semiconductors. In these cases, the work function of MXenes plays an important role in the energy level alignment to the subsequently deposited organic layer, as it determines the electron and hole injection barriers. Therefore, methods for controlling the Ti3C2Tx work function should be developed. We demonstrate that, by using thin layers of metal organic donor acceptor molecules, the work function of Ti3C2Tx can be tuned over a range of gt;3 eV. This enables tuning the energy level alignment to a subsequently deposited organic semiconductor, all the way from intrinsic Fermi level pinning at the highest occupied molecular energy level minimal hole injection barrier to pinning at the lowest unoccupied level minimal electron injection barrier . Furthermore, it is shown that a predominantly oxygen terminated surface does not lead to an extraordinary high work function, in contrast to theoretical predictions. The proposed strategy may greatly expand the use of MXenes in conjunction with organic hole and electron transport layers in optoelectronic devices |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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