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Published on: March 6, 2017
Charge Mobility and Dynamics in Spin-Crossover Nanoparticles Studied by Time-Resolved Microwave Conductivity
Julien Dugay1,2, Wiel Evers1,3, Ramón Torres-Cavanillas2
1Kavli Institute of Nanoscience , Delft University of Technology , Lorentzweg 1 , 2628 CJ Delft , The Netherlands.
We used electrodeless time-resolved microwave conductivity (TRMC) to study spin-crossover (SCO) nanoparticles. TRMC reveals shallow-trap states below 225 K and thermally activated hopping above, offering insights into charge transport in SCO materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Spin-crossover (SCO) materials exhibit distinct magnetic states.
- Understanding charge transport in SCO nanoparticles is crucial for their applications.
Purpose of the Study:
- To characterize spin-crossover (SCO) nanoparticles using electrodeless time-resolved microwave conductivity (TRMC).
- To simultaneously assess the magnetic state and nanoscale charge transport of SCO compounds.
Main Methods:
- Electrodeless time-resolved microwave conductivity (TRMC) technique.
- Variable temperature measurements from liquid nitrogen temperature up to 360 K.
Main Results:
- TRMC successfully characterized SCO nanoparticles, providing magnetic state and charge transport data.
- Two distinct conductivity regimes were observed around a transition temperature (TR) near 225 K.
- Below TR, shallow-trap states were indicated by an activationless regime and short carrier lifetimes. Above TR, a thermally activated hopping regime with increased mobility and barrier energy was observed.
Conclusions:
- TRMC is a simple and accurate method for probing SCO nanoparticles.
- Charge transport mechanisms in SCO nanoparticles are temperature-dependent, involving shallow traps and thermally activated hopping.
- Activation energy is influenced by polaronic effects, phonons, and SCO moiety fluctuations.
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