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Title:Modulation of charge transfer exciton dynamics in organic semiconductors using different structural arrangements
Authors:ID Soncini, Cristian (Author)
ID Kumar, Abhishek (Author)
ID Bondino, Federica (Author)
ID Magnano, Elena (Author)
ID Stupar, Matija (Author)
ID Ressel, Barbara (Author)
ID De Ninno, Giovanni (Author)
ID Papadopoulos, Antonis (Author)
ID Serpetzoglou, Efthymis (Author)
ID Stratakis, Emmanuel (Author)
ID Pedio, Maddalena (Author)
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:In devices based on organic semiconductors, aggregation and inter-molecular interactions play a key role in affecting the photo-physical and dynamical carrier properties of the material, potentially becoming a limiting factor to achieving high efficiency. As a consequence, a detailed understanding of the interplay between the film molecular structure and the material properties is essential to properly design devices with optimized performance. Here we demonstrate how different molecular structural arrangements modulate the charge transfer (CT) dynamics in cobalt phthalocyanine (CoPc) thin films. By transient absorption spectroscopy and time-resolved photoemission spectroscopy, we study the influence of different CoPc structures on the dynamical electronic properties, the CoPc intra and inter- molecular de-excitation pathways up to 7 ns. We rationalize the ultrafast formation of triplet states in the CoPc through an electron exchange process between the single-occupied Co3dz2 orbital and p orbitals of the macrocycle, which obviate for an energetically unfavourable spin-flip. We found enhanced CT exciton lifetime in the case of the herringbone structure with respect to the brickwork one, possibly explainable by a more efficient CT exciton delocalization along the stacking axis.
Keywords:charge transfer, organic molecules, time resolved spectroscopies
Publication date:01.01.2023
Year of publishing:2023
Number of pages:str. 10266-10273
Numbering:Vol. 11, issue 30
PID:20.500.12556/RUNG-8278-a567ec85-0b81-7de5-262c-f4175d8f67e7 New window
COBISS.SI-ID:157361923 New window
ISSN on article:2050-7526
DOI:10.1039/D3TC00734K New window
Publication date in RUNG:30.06.2023
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Record is a part of a journal

Title:Journal of materials chemistry. Materials for optical and electronic devices
Shortened title:J. mater. chem. C
Publisher:RSC Publications
COBISS.SI-ID:16529430 New window