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Temperature-dependent vibrational spectroscopy to study order-disorder transitions in charge transfer complexes

Charge-transfer (CT) complexes are a promising class of materials for the semiconductor industry because of their versatile properties. This class of compounds shows a variety of phase transitions, which are of interest because of their potential impact on the electronic characteristics. Here temper...

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Hauptverfasser: Isaac, Rohan (VerfasserIn) , Goetz, Katelyn (VerfasserIn) , Roberts, Drew (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 16 February 2018
In: AIP Advances
Year: 2018, Jahrgang: 8, Heft: 2
ISSN:2158-3226
DOI:10.1063/1.5018731
Online-Zugang:Verlag, Volltext: https://doi.org/10.1063/1.5018731
Verlag, Volltext: https://aip.scitation.org/doi/10.1063/1.5018731
Volltext
Verfasserangaben:Rohan Isaac, Katelyn P. Goetz, Drew Roberts, Oana D. Jurchescu, L.E. McNeil

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520 |a Charge-transfer (CT) complexes are a promising class of materials for the semiconductor industry because of their versatile properties. This class of compounds shows a variety of phase transitions, which are of interest because of their potential impact on the electronic characteristics. Here temperature-dependent vibrational spectroscopy is used to study structural phase transitions in a set of organic CT complexes. Splitting and broadening of infrared-active phonons in the complex formed between pyrene and pyromellitic dianhydride (PMDA) confirm the structural transition is of the order-disorder type and complement previous x-ray diffraction (XRD) results. We show that this technique is a powerful tool to characterize transitions, and apply it to a range of binary CT complexes composed of polyaromatic hyrdocarbons (anthracene, perylene, phenanthrene, pyrene, and stilbene) and PMDA. We extend the understanding of transitions in perylene-PMDA and pyrene-PMDA, and show that there are no order-disorder transitions present in anthracene-PMDA, stilbene-PMDA and phenanthrene-PMDA in the temperature range investigated here. 
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