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Electronic Structure Tunability by Periodic meta-Ligand Spacing in One-Dimensional Organic Semiconductors.
Piquero-Zulaica, Ignacio; Garcia-Lekue, Aran; Colazzo, Luciano; Krug, Claudio K; Mohammed, Mohammed S G; Abd El-Fattah, Zakaria M; Gottfried, J Michael; de Oteyza, Dimas G; Ortega, J Enrique; Lobo-Checa, Jorge.
Afiliação
  • Piquero-Zulaica I; Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center , Paseo Manuel de Lardizabal 5 , E-20018 San Sebastián , Spain.
  • Garcia-Lekue A; Donostia International Physics Center (DIPC) , Paseo Manuel de Lardizabal 4 , E-20018 Donostia-San Sebastián , Spain.
  • Colazzo L; Ikerbasque, Basque Foundation for Science , 48011 Bilbao , Spain.
  • Krug CK; Donostia International Physics Center (DIPC) , Paseo Manuel de Lardizabal 4 , E-20018 Donostia-San Sebastián , Spain.
  • Mohammed MSG; Fachbereich Chemie , Philipps-Universität Marburg , Hans-Meerwein-Str. 4 , 35032 Marburg , Germany.
  • Abd El-Fattah ZM; Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center , Paseo Manuel de Lardizabal 5 , E-20018 San Sebastián , Spain.
  • Gottfried JM; Donostia International Physics Center (DIPC) , Paseo Manuel de Lardizabal 4 , E-20018 Donostia-San Sebastián , Spain.
  • de Oteyza DG; ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Castelldefels, Barcelona , Spain.
  • Ortega JE; Physics Department, Faculty of Science , Al-Azhar University , Nasr City , E-11884 Cairo , Egypt.
  • Lobo-Checa J; Fachbereich Chemie , Philipps-Universität Marburg , Hans-Meerwein-Str. 4 , 35032 Marburg , Germany.
ACS Nano ; 12(10): 10537-10544, 2018 Oct 23.
Artigo em Inglês | MEDLINE | ID: mdl-30295463
ABSTRACT
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.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: ACS Nano Ano de publicação: 2018 Tipo de documento: Artigo País de afiliação: Espanha