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New fluorene-based bipolar charge transporting materials
Aistė Jegorovė1, Marytė Daškevičienė1, Kristina Kantminienė2
1Department of Organic Chemistry, Kaunas University of Technology Radvilėnų pl. 19 Kaunas 50254 Lithuania.
RSC Advances
|January 19, 2024
Summary
New fluorene-based bipolar charge transporting materials (CTMs) offer air stability and solution processability for electronic applications. These materials show promising charge transport properties, with hole mobilities reaching 10-4 cm2 V-1 s-1.
Area of Science:
- Materials Science
- Organic Electronics
- Photochemistry
Background:
- Developing stable and processable organic semiconductors is crucial for advancing electronic devices.
- Fluorene-based materials are widely explored due to their unique optoelectronic properties.
Purpose of the Study:
- To design and synthesize novel fluorene-based bipolar charge transporting materials (CTMs).
- To investigate the structure-property relationships and charge transport characteristics of these CTMs.
Main Methods:
- Molecular design and organic synthesis of fluorene-based CTMs incorporating anthraquinone, 9-fluorenone, and 9-dicyanofluorenylidine groups.
- Characterization of film formation properties for solution processing.
- Computational quantum chemistry simulations to analyze molecular conformations and charge transfer.
- Optical absorption measurements.
- Charge mobility measurements (hole and electron mobility).
Main Results:
- Synthesized air-stable and solution-processable fluorene-based CTMs with good film-forming capabilities.
- Quantum chemistry simulations and optical data confirmed stable conformers and intramolecular charge transfer complexes.
- Achieved hole mobilities in the range of 10-4 to 10-5 cm2 V-1 s-1.
- Electron mobility was observed to be approximately one order of magnitude lower than hole mobility in specific compounds.
Conclusions:
- The designed fluorene-based CTMs demonstrate potential for use in organic electronic devices owing to their stability and processability.
- The molecular structure significantly influences charge transport properties.
- Further optimization could lead to balanced charge transport for enhanced device performance.
