RT Journal Article
T1 The fluorination effect: the importance of backbone planarity in achieving high performance ambipolar field effect transistors
A1 Gámez-Valenzuela, Sergio
A1 Comí, Marc
A1 González, S. R.
A1 Delgado, M. C. R
A1 Al-Hashimi, Mohammed
A1 Ortiz, R. P.
K1 Fluoración
AB We report here the synthesis and physico-chemical characterization of a series of donor–acceptor (D–A) copolymers consisting of 4,7-di(2-thienyl)-2,1,3-benzothiadiazole and isoindigo building blocks, which have been progressively fluorinated with the aim of enhancing intrachain interactions and thus increasing their electrical performances in organic field effect transistors (OFETs). The effect of the polymeric partially locked conformations, upon fluorination, on the material properties has been comprehensively analyzed by means of spectroscopic (UV-vis-NIR and Raman) and electrochemical techniques and density functional theory (DFT) calculations. Raman spectroscopy highlights that the impact of gradual fluorination on the molecular and electronic properties is highly dependent on the building blocks into which the fluorine atoms are introduced, being a much more efficient strategy to add them in the isoindigo unit. Electrical characterization of OFETs also shows that fluorination progressively increases the polymer coplanarity and electron affinity, varying the electrical performance from low hole dominated charge transport in the unfluorinated polymer to balanced ambipolar charge transport in the fluorinated ones. The best field-effect mobilities were recorded when fluorine atoms were added to the isoindigo unit, with values of 0.1 cm2 V−1 s−1 for both hole and electron transports.
PB RSC
YR 2022
FD 2022-01-12
LK https://hdl.handle.net/10630/26533
UL https://hdl.handle.net/10630/26533
LA eng
NO Gámez-Valenzuela, S., Comi, M., González, S. R., Delgado, M. C. R., Al-Hashimi, M., & Ortiz, R. P. (2023). The Fluorination Effect: Importance of Backbone Planarity in Achieving High Performance Ambipolar Field Effect Transistors. Journal of Materials Chemistry C.
NO The work at the University of Málaga was supported by the MICINN (project PID2019-110305GB-I00) and by Junta de Andalucía (project P18-FR-4559). S. G.-V. thanks the MINECO for an FPU predoctoral fellowship (FPU17/04908). The authors would like to thank the computer resources, technical expertise and assistance provided by the SCBI (Supercomputing and Bioinformatics) centre of the University of Málaga. The Vibrational spectroscopy (EVI), XRD and AFM labs of the Research Central Services (SCAI) of the University of Málaga are also gratefully acknowledged. Al-Hashimi likes to acknowledge the financial support from the Qatar National Research Fund, Project Number NPRP12S-0304-190227.Notes and references   //   Funding for open access charge: Universidad de Málaga
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026