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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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
16 February 2018
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| In: |
AIP Advances
Year: 2018, Volume: 8, Issue: 2 |
| ISSN: | 2158-3226 |
| DOI: | 10.1063/1.5018731 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1063/1.5018731 Verlag, Volltext: https://aip.scitation.org/doi/10.1063/1.5018731 
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| Author Notes: | Rohan Isaac, Katelyn P. Goetz, Drew Roberts, Oana D. Jurchescu, L.E. McNeil |
| Summary: | 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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| Item Description: | Gesehen am 18.02.2020 |
| Physical Description: | Online Resource |
| ISSN: | 2158-3226 |
| DOI: | 10.1063/1.5018731 |