ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

Lampert triangle formation and relaxation behavior in doped poly(3,4-ethylenedioxythiophene) devices

Roy, AP and Mandal, SD and Menon, R (2021) Lampert triangle formation and relaxation behavior in doped poly(3,4-ethylenedioxythiophene) devices. In: Journal of Applied Physics, 129 (19).

[img] PDF
jou_app_phy_129-19_2021.pdf - Published Version
Restricted to Registered users only

Download (2MB) | Request a copy
Official URL: https://doi.org/10.1063/5.0042737


The current density-voltage (J-V) characteristics in stainless steel/poly(3,4-ethylenedioxythiophene)/Ag devices show the formation of the complete Lampert triangle (�ABC) bounded by three limiting curves: Ohmic, trap-limited/filling space charge limited conduction, and trap-free/trap-filled space charge limited conduction. From the analysis of the Lampert triangle, values for carrier density (p0) -0.72 � 1013/cm3, mobility (μp) -77.47 � 10-4 cm2/V s, and transit time (tt) -10-12 s are obtained and also the transition voltages for different conduction mechanisms are estimated. The relaxation processes in bulk and interface are observed to be different from temperature-dependent impedance measurements. Estimated values of relaxation times are interface (�1) -10-3 s and bulk (�2) -10-6 s. Two parallel RQ (Q: constant phase element) circuits in series are used to fit the impedance data; however, the model varies for data at 110 and 120 K (two parallel CQ circuits in series). Since the samples have doped carriers, the activation energies are low (< 70 meV), and relaxation times follow Arrhenius behavior. © 2021 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 American Institute of Physics Inc.
Keywords: Hall mobility; Hole mobility; Relaxation time, 3 ,4-ethylenedioxythiophene; Constant phase element; Current density-voltage characteristics; Impedance measurement; Poly-3 ,4-ethylenedioxythiophene; Relaxation behaviors; Space charge limited conduction; Temperature dependent, Activation energy
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 23 Aug 2021 09:29
Last Modified: 23 Aug 2021 09:29
URI: http://eprints.iisc.ac.in/id/eprint/69250

Actions (login required)

View Item View Item