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Electron Spin Polarization and Rectification Driven by Chiral Perylene Diimide-Based Nanodonuts
Chih-Hung Ko1, Qirong Zhu2, George Bullard1
1Department of Chemistry, Duke University, Durham, North Carolina 27708, United States.
The Journal of Physical Chemistry Letters
|November 8, 2023
Summary
Chiral perylene diimide nanostructures exhibit spin-diode behavior. These chiral nanostructures demonstrate significant spin polarization and current rectification, paving the way for nanoscale spin current rectifiers.
Area of Science:
- Organic electronics
- Nanotechnology
- Spintronics
Background:
- Chirality-induced spin selectivity (CISS) enables chiral molecules to act as spin filters.
- Thin-film layers of chiral conjugated molecules are key for ambient temperature spin filtering.
Purpose of the Study:
- To investigate spin-diode behavior in chiral nanostructures.
- To explore the potential of perylene diimide (PDI) nanostructures for nanoscale spin current rectification.
Main Methods:
- Solvent-modulated dropcasting of chiral l- and d-perylene diimide (PDI) monomers.
- Fabrication of nanofiber and nanodonut aggregate morphologies.
- Magnetic conductive atomic force microscopy (mC-AFM) for current-voltage measurements.
Main Results:
- Nanodonut structures exhibited clear spin-diode behavior.
- Measured spin polarizations and spin current rectification ratios exceeded 10.
- Asymmetric molecular junctions in nanodonuts were crucial for observed effects.
Conclusions:
- Chiral nanostructures with asymmetric molecular junctions can function as effective CISS-based nanoscale spin current rectifiers.
- PDI nanostructures show promise for advanced spintronic applications.
- The study highlights the tunability of nanostructure morphology for spin filtering.
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