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Influence of the relative molecular orientation on interfacial charge-transfer Excitons at donor/acceptor Nanoscale heterojunctions
Aghamohammadi, Mahdieh (Institut de Ciència de Materials de Barcelona)
Fernández, Anton (Institut de Ciència de Materials de Barcelona)
Schmidt, Malte (Institut de Ciència de Materials de Barcelona)
Pérez-Rodríguez, Ana (Institut de Ciència de Materials de Barcelona)
Goñi, Alejandro (Institut de Ciència de Materials de Barcelona)
Fraxedas, Jordi (Institut Català de Nanociència i Nanotecnologia)
Sauthier, Guillaume (Institut Català de Nanociència i Nanotecnologia)
Paradinas Aranjuelo, Marcos (Institut de Ciència de Materials de Barcelona)
Ocal García, Carmen (Institut de Ciència de Materials de Barcelona)
Barrena, Esther (Institut de Ciència de Materials de Barcelona)

Date: 2014
Abstract: We address the impact of the relative orientation between donor (D) and acceptor (A) molecules at the D/A heterojunction on the exciton dissociation. For this purpose, two-dimensional heterojunctions of diindenoperylene (DIP) and N,N'-dioctyl-3,4,9,10-perylene tetracarboxylicdiimide (PTCDI-C) deposited onto SiO/Si are grown, which exemplify two model interfaces with the π-staking direction either perpendicular or parallel to the interface. Aspects related to the morphology of the heterojunctions and charge photogeneration are studied by scanning probe force methods and photoluminescence (PL) spectroscopy. Results from PL spectroscopy indicate that the exciton dissociation is influenced by the different relative molecular orientations of A and D. For the configuration with stronger orbital overlap between A and D at the interface, the exciton dissociation is dominated by recombination from an interfacial charge-transfer state. © 2014 American Chemical Society.
Grants: Ministerio de Ciencia e Innovación MAT2010-20020
Ministerio de Educación y Ciencia CSD2007-00041
Rights: Tots els drets reservats.
Language: Anglès
Document: Article ; recerca ; Versió acceptada per publicar
Subject: Charge photogeneration ; Charge transfer state ; Exciton dissociation ; Model interface ; Orbital overlap ; PL spectroscopy ; Relative orientation ; Scanning probes
Published in: Journal of physical chemistry. C, Vol. 118, Num. 27 (June 2014) , p. 14833-14839, ISSN 1932-7455

DOI: 10.1021/jp5041579


Postprint
28 p, 654.8 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2023-06-01, last modified 2023-06-17



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