Influence of relative humidity on the electrical response of PEDOT:PSS based organic field-effect transistor

Zafar, Qayyum and Abdullah, Shahino Mah and Azmer, Mohamad Izzat and Najeeb, Mansoor Ani and Qadir, Karwan Wasman and Sulaiman, Khaulah (2018) Influence of relative humidity on the electrical response of PEDOT:PSS based organic field-effect transistor. Sensors and Actuators B: Chemical, 255. pp. 2652-2656. ISSN 0925-4005, DOI

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We have investigated the influence of relative humidity on the electrical response of a bottom gate organic field-effect transistor (OFET) with poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) (PEDOT:PSS) as an active channel material. For sensor fabrication, the organic polymer PEDOT:PSS has been spun-cast on highly doped n-Si wafer with preliminary thermally deposited gold, source and drain electrodes. The structural characterization and surface morphology study of active layer has been performed by XRD and FESEM, respectively. From the transfer characteristic curve, the p-type hole conductivity in PEDOT:PSS thin film is confirmed. Whereas from the output current-voltage (I–V) characteristic of the OFET, the Ion/Ioff ratio has been measured to be ∼2.6, when operated at relative humidity (RH) ∼60%. The humidity sensing characteristics of the OFET have further been investigated by exposing the proposed OFET to varied RH levels (40–80% RH) at room temperature (26.2 °C). Within the humidity range examined, the channel current has been observed to amplify by nearly 29.4 times of its magnitude.

Item Type: Article
Funders: Ministry of Education: the financial support under High Impact Research (HIR) grant UM.S/625/3/HIR/MOE/26, University Malaya Research Grant (UMRG) under grant number RP007A-13AFR
Uncontrolled Keywords: Conductive polymer PEDOT:PSS; Humidity adsorption-desorption kinetics; Organic field effect transistor; Humidity sensor; Physisorption and chemisorption
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Jan 2019 02:35
Last Modified: 30 Jan 2019 02:35

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