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Título: | Electronic structure tunability by periodic meta-ligand spacing in one-dimensional organic semiconductors |
Autor: | Piquero-Zulaica, Ignacio CSIC ORCID; Garcia-Lekue, Aran CSIC ORCID; Colazzo, Luciano; Krug, Claudio; Mohammed, Mohammed S. G.; Abd El-Fattah, Z. M. CSIC ORCID; Gottfried, J. Michael; Oteyza, Dimas G. de CSIC ORCID; Ortega, J. Enrique CSIC ORCID; Lobo-Checa, Jorge CSIC ORCID | Palabras clave: | Cross-conjugated polymers Electron confinement Electronic structure On-surface synthesis Ultrathin organic films Vicinal surfaces |
Fecha de publicación: | 2018 | Editor: | American Chemical Society | Citación: | ACS Nano 12(10): 10537-10544 (2018) | Resumen: | Designing molecular organic semiconductors with distinct frontier orbitals is key for the development of devices with desirable properties. Generating defined organic nanostructures with atomic precision can be accomplished by on-surface synthesis. We use this “dry” chemistry to introduce topological variations in a conjugated poly(para-phenylene) chain in the form of meta-junctions. As evidenced by STM and LEED, we produce a macroscopically ordered, monolayer thin zigzag chain film on a vicinal silver crystal. These cross-conjugated nanostructures are expected to display altered electronic properties, which are now unraveled by highly complementary experimental techniques (ARPES and STS) and theoretical calculations (DFT and EPWE). We find that meta-junctions dominate the weakly dispersive band structure, while the band gap is tunable by altering the linear segment’s length. These periodic topology effects induce significant loss of the electronic coupling between neighboring linear segments leading to partial electron confinement in the form of weakly coupled quantum dots. Such periodic quantum interference effects determine the overall semiconducting character and functionality of the chains. | Versión del editor: | https://doi.org/10.1021/acsnano.8b06536 | URI: | http://hdl.handle.net/10261/181013 | DOI: | 10.1021/acsnano.8b06536 | ISSN: | 1936-0851 | E-ISSN: | 1936-086X |
Aparece en las colecciones: | (ICMA) Artículos (CFM) Artículos |
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zigzagmainFinal.pdf | 1,17 MB | Adobe PDF | Visualizar/Abrir |
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