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- Title
Intra‐Island Coulomb Correlations in PEDOT:PSS Thin Films; Saturation of Spin Polarization Magnetoresistance.
- Authors
Nikiforov, Daniel; Tessler, Nir; Ehrenfreund, Eitan
- Abstract
Magnetic field and temperature dependence of the magneto‐conductance (MC) of thin films made of self‐p‐doped poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) having room temperature conductivity of ≈200 S cm−1 in the range of fields B = 0–14 T and temperatures T = 1.8–300 K are reported. At B = 0 and for current parallel to the film surface, the conductance follows a variable range hopping mechanism in two dimensions. It is shown that the finite Coulomb correlations, U, within the nano‐crystalline PEDOT islands dominates MC at low temperatures and high fields. At T = 1.8 K, the intra‐island Coulomb correlation spin polarization mechanism is already saturated for B > 10 T establishing a finite minimum of ≈2 meV for U. This small value of U is in line with the delocalized nature of the holes within the PEDOT islands and the relatively high conductivity that makes it essential in organic opto‐electronics.
- Subjects
SPIN polarization; THIN films; ENHANCED magnetoresistance; LOW temperatures; MAGNETIC fields; LEAD titanate
- Publication
Advanced Electronic Materials, 2021, Vol 7, Issue 4, p1
- ISSN
2199-160X
- Publication type
Article
- DOI
10.1002/aelm.202001033