Polaron spin dynamics in high-mobility polymeric semiconductors

Sam Schott, Uday Chopra, Vincent Lemaur, Anton Melnyk, Yoan Olivier, Riccardo Di Pietro, Igor Romanov, Remington L. Carey, Xuechen Jiao, Cameron Jellett, Mark Little, Adam Marks, Christopher R. McNeill, Iain McCulloch, Erik R. McNellis, Denis Andrienko, David Beljonne, Jairo Sinova, Henning Sirringhaus

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Abstract

Polymeric 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.
Original languageEnglish (US)
Pages (from-to)814-822
Number of pages9
JournalNature Physics
Volume15
Issue number8
DOIs
StatePublished - Jun 3 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Funding 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.

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    Schott, S. (Creator), Chopra, U. (Creator), Lemaur, V. (Creator), Melnyk, A. (Creator), Olivier, Y. (Creator), Di Pietro, R. (Creator), Romanov, I. (Creator), Carey, R. L. (Creator), Jiao, X. (Creator), Jellett, C. (Creator), Little, M. (Creator), Marks, A. (Creator), McNeill, C. R. (Creator), McCulloch, I. (Creator), McNellis, E. R. (Creator), Andrienko, D. (Creator), Beljonne, D. (Creator), Sinova, J. (Creator), Sirringhaus, H. (Creator), Schott, S. (Creator), Chopra, U. (Creator), Lemaur, V. (Creator), Melnyk, A. (Creator), Olivier, Y. (Creator), Di Pietro, R. (Creator), Romanov, I. (Creator), Carey, R. L. (Creator), Jiao, X. (Creator), Jellett, C. (Creator), Little, M. (Creator), Marks, A. (Creator), McNeill, C. R. (Creator), McNellis, E. R. (Creator), Andrienko, D. (Creator), Beljonne, D. (Creator), Sinova, J. (Creator) & Sirringhaus, H. (Creator), Apollo - University of Cambridge Repository, Jun 3 2019

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