Luminescent 2D single crystals of thiophene–phenylene co-oligomers for field-effect devices

Fedorenko, R.S.; Kuevda, A.V.; Trukhanov, V.A.; Sosorev, A.Y.; Bakirov, A.V.; Dorokhov, A.I.; Surin, N.M.; Borshchev, O.V.; Ponomarenko, S.A.; Paraschuk, D.Y.

Авторы: Fedorenko Roman S., Kuevda Alexey V., Trukhanov Vasiliy A., Sosorev Andrey Yu, Bakirov Artem V., Dorokhov Artem I., Surin Nicolay M., Borshchev Oleg V., Ponomarenko Sergey A., Paraschuk Dmitry Yu
Журнал: Materials Chemistry Frontiers
Год издания: 2022
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d2qm00768a
Аннотация: Two-dimensional (2D) organic semiconductor macroscopic single crystals have recently demonstrated their excellent charge-transport properties competing with their 3D counterparts. However, the combination of efficient charge transport and prominent luminescent properties in an organic 2D material is still a challenge. Here, we report on 2D emissive semiconductor single crystals based on four and fivering thiophene–phenylene co-oligomers with didecyl terminal substituents—DD-PTTP and DD-PTPTP, where P and T stand for phenylene and thiophene, respectively—and investigate how the insertion of a P-ring in the PTTP conjugated core impacts the molecular and various solid-state properties of the material. DD-PTTP and DD-PTPTP were synthesized and characterized, and then macroscopic 2D single crystals of both oligomers in the form of monolayer and few-layer films were grown from solution and studied by optical interference, photoluminescence (PL), and atomic-force microscopies. Polarizationsensitive PL microscopy revealed the orientation of the conjugated cores in 2D crystals relative to their facets and indicated that the molecules are H-aggregated. 2D organic field-effect transistors (OFETs) based on both oligomers showed good stability, and their performance nicely followed the Shockley model with a charge-carrier mobility of up to 0.2 cm2 V1 s1, which is among the best values for various materials based on linearly conjugated oligomers. The highest charge-carrier mobility was demonstrated for the monolayer devices indicating high molecular order in the monolayer single crystals. 2D organic light-emitting transistors (OLETs) with DD-PTTP and DD-PTPTP active layers were demonstrated, and the DD-PTPTP-based 2D OFETs and OLETs showed higher performance. The latter was assigned to the stronger intermolecular interactions in DD-PTPTP stemming from its longer conjugation length despite the almost equal optical gaps of DD-PTTP and DD-PTPTP. The results obtained show that macroscopic 2D single crystals of thiophene–phenylene co-oligomers are apromising platform for 2D organic optoelectronics.
Добавил в систему: Труханов Василий Андреевич

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Luminescent 2D single crystals of thiophene–phenylene co-oligomers for field-effect devicesстатья

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