Spin-dependent recombination probed through the dielectric polarizability

Sam L. Bayliss, Neil C. Greenham, Richard H. Friend, Hélène Bouchiat and Alexei D Chepelianskii ()
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Sam L. Bayliss: Cavendish Laboratory, University of Cambridge
Neil C. Greenham: Cavendish Laboratory, University of Cambridge
Richard H. Friend: Cavendish Laboratory, University of Cambridge
Hélène Bouchiat: LPS, Université Paris-Sud, CNRS
Alexei D Chepelianskii: Cavendish Laboratory, University of Cambridge

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Despite residing in an energetically and structurally disordered landscape, the spin degree of freedom remains a robust quantity in organic semiconductor materials due to the weak coupling of spin and orbital states. This enforces spin-selectivity in recombination processes which plays a crucial role in optoelectronic devices, for example, in the spin-dependent recombination of weakly bound electron-hole pairs, or charge-transfer states, which form in a photovoltaic blend. Here, we implement a detection scheme to probe the spin-selective recombination of these states through changes in their dielectric polarizability under magnetic resonance. Using this technique, we access a regime in which the usual mixing of spin-singlet and spin-triplet states due to hyperfine fields is suppressed by microwave driving. We present a quantitative model for this behaviour which allows us to estimate the spin-dependent recombination rate, and draw parallels with the Majorana–Brossel resonances observed in atomic physics experiments.

Date: 2015
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DOI: 10.1038/ncomms9534

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