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Influence of the relative molecular orientation on interfacial charge-transfer Excitons at donor/acceptor Nanoscale heterojunctions
Authors
Mahdieh Aghamohammadi
Esther Barrena
+8 more
Anton Fernández
Jordi Fraxedas
Alejandro Goñi
Carmen Ocal García
Marcos Paradinas Aranjuelo
Ana Pérez-Rodríguez
Guillaume Sauthier
Malte Schmidt
Publication date
1 January 2014
Publisher
Doi
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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
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Last time updated on 04/08/2023