Tuning the effective spin-orbit coupling in molecular semiconductors

Sam Schott, Erik R. McNellis, Christian B. Nielsen, Hung-Yang Chen, Shun Watanabe, Hisaaki Tanaka, Iain McCulloch, Kazuo Takimiya, Jairo Sinova and Henning Sirringhaus ()
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Sam Schott: Cavendish Laboratory, University of Cambridge
Erik R. McNellis: Institute of Physics, Johannes Gutenberg-Universität
Christian B. Nielsen: Imperial College London
Hung-Yang Chen: Imperial College London
Shun Watanabe: The University of Tokyo, 5-1-5 Kashiwanoha
Hisaaki Tanaka: Nagoya University
Iain McCulloch: Imperial College London
Kazuo Takimiya: RIKEN Center for Emergent Matter Science
Jairo Sinova: Institute of Physics, Johannes Gutenberg-Universität
Henning Sirringhaus: Cavendish Laboratory, University of Cambridge

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract The control of spins and spin to charge conversion in organics requires understanding the molecular spin-orbit coupling (SOC), and a means to tune its strength. However, quantifying SOC strengths indirectly through spin relaxation effects has proven difficult due to competing relaxation mechanisms. Here we present a systematic study of the g-tensor shift in molecular semiconductors and link it directly to the SOC strength in a series of high-mobility molecular semiconductors with strong potential for future devices. The results demonstrate a rich variability of the molecular g-shifts with the effective SOC, depending on subtle aspects of molecular composition and structure. We correlate the above g-shifts to spin-lattice relaxation times over four orders of magnitude, from 200 to 0.15 μs, for isolated molecules in solution and relate our findings for isolated molecules in solution to the spin relaxation mechanisms that are likely to be relevant in solid state systems.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15200

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DOI: 10.1038/ncomms15200

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