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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.57: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

EPR spectroscopic signatures of C₆₀ and C₇₀ fullerene cations — •René Wieczorek, Svetlana Kucher, Sven Berlekamp, and Wolfgang Harneit — Fachbereich Physik, Universität Osnabrück, Deutschland

Due to their relatively high reactivity, spectroscopic data are scarce for fullerene cations in condensed matter. Especially EPR parameters seem to depend greatly on the choosen method of cation preparation.

Nevertheless, there is a growing interest in charged fullerene species within several research fields. For organic solar cells, the role of oxidized fullerene derivatives as possible intermediates in charge carrier transport has been discussed. Correspondingly, magnetic resonance methods (EPR, EDMR) rely on precise spectroscopic signatures to identify the different species taking part in such processes. Similarly, the potential application of endohedral group-V fullerenes, either as qubits or as molecular probes for magnetic fields, requires identification of competing spin carrying derivatives, namely C₆₀ and C₇₀ cations or anions.

We therefore use a reported protocol, oxidation of fullerenes by means of iron(III)-exchanged zeolite NaY, to conduct a systematic study of fullerene cations using EPR spectroscopy. We report on pulsed and cw measurements at different frequency bands (X-, Q-, and W-band). Consequences of our findings for the different research fields are discussed.