Electric field and temperature dependent conductivity in PEDOT:PSS/PVA

The charge transport in conducting polymer blends of poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) [PEDOT:PSS] and polyvinyl alcohol (PVA) at 75, 50, 25, and 12 vol. % of PEDOT:PSS is investigated in the temperature range of 300–4.2 K. The scaling fit to percolative transport [σ ∝ |f − fc...

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Bibliographic Details
Published in:Journal of applied physics 2023-08, Vol.134 (5)
Main Authors: Mohan, Arya, Menon, Reghu
Format: Article
Language:English
Subjects:
Charge transport
Conducting polymers
Electric fields
Metal-insulator transition
Polymer blends
Polystyrene resins
Polyvinyl alcohol
Temperature dependence
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Summary:The charge transport in conducting polymer blends of poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) [PEDOT:PSS] and polyvinyl alcohol (PVA) at 75, 50, 25, and 12 vol. % of PEDOT:PSS is investigated in the temperature range of 300–4.2 K. The scaling fit to percolative transport [σ ∝ |f − fc|t] shows that fc is around 10% and t = 2. The temperature dependent conductivity varies from the critical regime of metal–insulator transition to variable range hopping, along with the alterations in the networks of PEDOT:PSS in PVA. The variation in the exponent (n) in electric field dependent conductivity is more significant as the volume fraction of PEDOT:PSS decreases. The value of n decreases as the thermal contribution to transport dominates, showing the competing roles of both field and temperature.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0151116