Charge Mobility and Dynamics in Spin-Crossover Nanoparticles Studied by Time-Resolved Microwave Conductivity
| Autor: | Wiel H. Evers, Mónica Giménez-Marqués, Julien Dugay, Eugenio Coronado, Ramón Torres-Cavanillas, Herre S. J. van der Zant |
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| Rok vydání: | 2018 |
| Předmět: |
Length scale
Materials science Condensed Matter - Mesoscale and Nanoscale Physics Phonon Transition temperature FOS: Physical sciences Thermal fluctuations 02 engineering and technology Activation energy Liquid nitrogen 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Spin crossover Chemical physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Charge carrier Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry Letters |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.8b02267 |
| Popis: | We use the electrode-less time-resolved microwave conductivity (TRMC) technique to characterize spin-crossover (SCO) nanoparticles. We show that TRMC is a simple and accurate mean for simultaneously as-sessing the magnetic state of SCO compounds and charge transport information on the nanometre length scale. In the low-spin state from liquid nitrogen temperature up to 360 K the TRMC measurements present two well-defined regimes in the mobility and in the half-life times, possessing similar transition tempera-tures TR near 225 K. Below TR, an activation-less regime associated with short lifetimes of the charge carri-ers points at the presence of shallow-trap states. Above TR, these states are thermally released yielding a thermally activated hopping regime where longer hops increases the mobility and, concomitantly, the barrier energy. The activation energy could originate from intricate contributions such as polaronic self-localizations, but also from dynamic disorder due to phonons and/or thermal fluctuations of SCO moieties. Comment: 9 pages, 5 figures, Supplementary Information |
| Databáze: | OpenAIRE |
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