Di Pietro, Riccardo
Carey, Remington L.
McNeill, Christopher R.
McNellis, Erik R.
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Embargo End Date2019-07-01
Permanent link to this recordhttp://hdl.handle.net/10754/656373
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AbstractPolymeric semiconductors exhibit exceptionally long spin lifetimes, and recently observed micrometre spin diffusion lengths in conjugated polymers demonstrate the potential for organic spintronics devices. Weak spin–orbit and hyperfine interactions lie at the origin of their long spin lifetimes, but the coupling mechanism of a spin to its environment remains elusive. Here, we present a systematic study of polaron spin lifetimes in field-effect transistors with high-mobility conjugated polymers as an active layer. We demonstrate how spin relaxation is governed by the charges’ hopping motion at low temperatures, whereas an Elliott–Yafet-like relaxation due to a transient localization of the carrier wavefunctions is responsible for spin relaxation at high temperatures. In this regime, charge, spin and structural dynamics are intimately related and depend sensitively on the local conformation of polymer backbones and the crystalline packing of the polymer chains.
CitationSchott, S., Chopra, U., Lemaur, V., Melnyk, A., Olivier, Y., Di Pietro, R., … Sirringhaus, H. (2019). Polaron spin dynamics in high-mobility polymeric semiconductors. Nature Physics. doi:10.1038/s41567-019-0538-0
SponsorsFunding from ERC Synergy grant SC2 (no. 610115), the Alexander von Humboldt Foundation and the Transregional Collaborative Research Center (SFB/TRR) 173 SPIN+X is acknowledged. S.S. thanks the Winton Programme for the Physics of Sustainability and the Engineering and Physical Sciences Research Council (EPSRC) for funding as well as Z.-G. Yu for discussions, R. Chakalov for assistance with sample fabrication and S.-i. Kuroda, H. Tanaka and S. Watanabe for training and discussions. U.C. is a recipient of a DFG-funded position through the Excellence Initiative by the Graduate School Materials Science in Mainz (GSC 266). The work in Mons was supported by the European Commission/Région Wallonne (FEDER–BIORGEL project), the Consortium des Équipements de Calcul Intensif (CÉCI), funded by the Fonds National de la Recherche Scientifique (FRS-FNRS) under grant no. 2.5020.11 as well as the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by the Walloon Region under grant agreement n1117545, and FRS-FNRS. D.B. is FNRS Research Director. This research was undertaken in part on the SAXS/WAXS beamline at the Australian Synchrotron, part of ANSTO.
RelationsIs Supplemented By:
Schott, S., Chopra, U., Lemaur, V., Melnyk, A., Olivier, Y., DiPietro, R., Carey, R., Romanov, I., Jiao, X., Jellett, C., Little, M., Marks, A., McNeill, C. R., McCulloch, I., McNellis, E. R., Andrienko, D., Beljonne, D., Sinova, J., & Sirringhaus, H. (2019). Research data supporting "Polaron spin dynamics in high-mobility polymeric semiconductors" [Data set]. Apollo - University of Cambridge Repository. https://doi.org/10.17863/CAM.34786. DOI: 10.17863/cam.34786 Handle: 10754/664745
Title: OE-FET/customxepr: Instrument control suite for Bruker E500, MercuryiTC and Keithley 2600.. Publication Date: 2018-07-10. github: OE-FET/customxepr Handle: 10754/666989