Electronic Structure Tunability by Periodic meta-Ligand Spacing in One-Dimensional Organic Semiconductors

Piquero-Zulaica, I. ; Garcia-Lekue, A. ; Colazzo, L. ; Krug, C.K. ; Mohammed, M.S.G. ; Abd El-Fattah, Z.M. ; Gottfried, J.M. ; De Oteyza, D.G. ; Ortega, J.E. ; Lobo-Checa, J. (Universidad de Zaragoza)

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.

Idioma: Inglés

DOI: 10.1021/acsnano.8b06536

Año: 2018

Publicado en: ACS Nano 12, 10 (2018), 10537-10544
ISSN: 1936-0851

Factor impacto JCR: 13.903 (2018)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 9 / 148 = 0.061 (2018) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 9 / 94 = 0.096 (2018) - Q1 - T1
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 14 / 172 = 0.081 (2018) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 18 / 293 = 0.061 (2018) - Q1 - T1

Factor impacto SCIMAGO: 6.214 - Engineering (miscellaneous) (Q1) - Physics and Astronomy (miscellaneous) (Q1) - Nanoscience and Nanotechnology (Q1) - Materials Science (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/RASMIA Project
Financiación: info:eu-repo/grantAgreement/EC/H2020/635919/EU/Functional materials from on-surface linkage of molecular precursors/SURFINK
Financiación: info:eu-repo/grantAgreement/EUR/INTERREG V-A/EFA 194-16-TNSI
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2016-78293-C6

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)