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Electric field induced negative capacitance in semiconducting polymer

Mandal, S and Menon, R (2023) Electric field induced negative capacitance in semiconducting polymer. In: Journal of Applied Physics, 133 (9).

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Official URL: https://doi.org/10.1063/5.0139079


Electric field dependent capacitance and dielectric loss in poly(3-hexylthiophene) are measured by precision capacitance bridge. Carrier mobility and density are estimated from fits to current-voltage and capacitance data. The capacitance varies largely at lower frequency, and it decreases at higher electric fields. The negative capacitance at low frequency and high field is due to the negative phase angle between the dipole field and the ac signal. The intrinsic carrier density is calculated from fits to the Mott-Schottky equation, and this is consistent with I-V data analysis. At higher frequency, the carriers do not follow the ac signal and their density drops; and the flatband potential increases mainly due to the build-in potentials within ordered and amorphous regions in the sample. © 2023 Author(s).

Item Type: Journal Article
Publication: Journal of Applied Physics
Publisher: American Institute of Physics Inc.
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Dielectric losses; Electric fields, AC signals; Capacitance bridge; Current-voltage; Electric field induced; High electric fields; Low-high; Lower frequencies; Negative capacitance; Poly (3-hexylthiophene); Precision capacitance, Capacitance
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 20 Mar 2023 07:32
Last Modified: 20 Mar 2023 07:32
URI: https://eprints.iisc.ac.in/id/eprint/81013

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