Interdiffusion of molecular acceptors through organic layers to metal substrates mimics doping-related energy level shifts
| Autor: | Steffen Duhm, Norbert Koch, Ingo Salzmann, Benjamin Bröker, Hendrik Glowatzki, Robert L. Johnson |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Physics and Astronomy (miscellaneous) Chemistry Doping Fermi level Analytical chemistry Substrate (electronics) Electron acceptor Charge-transfer complex Triphenylamine Overlayer Metal symbols.namesake chemistry.chemical_compound Chemical physics visual_art symbols visual_art.visual_art_medium ddc:530 |
| Zdroj: | Applied physics letters 95, 093305 (2009). doi:10.1063/1.3213547 |
| DOI: | 10.1063/1.3213547 |
| Popis: | Photoemission measurements reveal energy level shifts toward the Fermi level when a strong electron acceptor (tetrafluoro-tetracyanoquinodimethane, F4-TCNQ) is deposited on pristine layers of 4,4′,4″-tris(N,N-diphenyl-amino)triphenylamine (TDATA) or 4,4′-bis(N-carbazolyl)biphenyl (CBP). The shifts of the TDATA and CBP energy levels toward the Fermi level of the Au substrate could, in principle, arise from p-type doping of the intrinsic organic layers. While this indeed takes place in TDATA, doping of CBP by F4-TCNQ, i.e., charge transfer complex formation, does not occur. The shifts observed in CBP arise from the diffusion of F4-TCNQ toward the Au substrate, which modifies the buried metal surface potential, leading to a realignment of the energy levels of the organic overlayer. |
| Databáze: | OpenAIRE |
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