Mohan, A and Anil, AG and Ramamurthy, PC and Menon, R (2022) Charge transport in cross-linked PEDOT:PSS near metal-insulator transition. In: Journal of Applied Physics, 131 (15).
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Abstract
The charge transport in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) cross-linked with divinyl sulfone (c-PEDOT:PSS) is compared with pristine PEDOT:PSS from conductivity, electric field, and frequency studies. In a cross-linked sample, the room temperature conductivity increased from 0.8 to 630 S/cm. The temperature dependence of conductivity, down to 4.2 K, is significantly weakened in a cross-linked sample. This cross-linking induced metal-insulator transition in PEDOT:PSS, as inferred from conductivity ratios (σ r = σ 300 K / σ 4.2 K), shows the role of modified nanomorphology in charge transport. The values of σ r for PEDOT:PSS and c-PEDOT:PSS are 6441 and 4.6, respectively. The temperature dependence of the electric-field effect on conductivity indicates that the nanoscale barriers for transport have been substantially reduced by cross-linking. Impedance spectroscopy studies suggest that the relaxation frequency in c-PEDOT:PSS is shifted to a higher frequency, and the real part decreases sharply at higher frequencies, indicating enhanced connectivity and weakened barriers between conductive PEDOT regions. © 2022 Author(s).
| Item Type: | Journal Article |
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| Publication: | Journal of Applied Physics |
| Publisher: | American Institute of Physics Inc. |
| Additional Information: | The copyright for this article belongs to Authors |
| Keywords: | Carrier transport; Conducting polymers; Electric field effects; Metal insulator boundaries; Metal insulator transition; Temperature distribution, Conductivity ratio; Cross linking; Divinyl sulfone; Electric frequency; Ethylenedioxythiophenes; High frequency HF; PEDOT/PSS; Poly(styrene sulfonate); Room-temperature conductivity; Temperature dependence, Semiconductor insulator boundaries |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 18 May 2022 11:10 |
| Last Modified: | 18 May 2022 11:10 |
| URI: | https://eprints.iisc.ac.in/id/eprint/72036 |
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