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Exploring the Critical Thickness of Organic Semiconductor Layer for Enhanced Piezoresistive Sensitivity in Field-Effect Transistor Sensors

Abstract : Organic semiconductors (OSCs) are promising transducer materials when applied in organic field-effect transistors (OFETs) taking advantage of their electrical properties which highly depend on the morphology of the semiconducting film. In this work, the effects of OSC thickness (ranging from 5 to 15 nm) on the piezoresistive sensitivity of a high-performance p-type organic semiconductor, namely dinaphtho [2,3-b:2,3-f] thieno [3,2-b] thiophene (DNTT), were investigated. Critical thickness of 6 nm thin film DNTT, thickness corresponding to the appearance of charge carrier percolation paths in the material, was demonstrated to be highly sensitive to mechanical strain. Gauge factors (GFs) of 42 ± 5 and −31 ± 6 were measured from the variation of output currents of 6 nm thick DNTT-based OFETs engineered on top of polymer cantilevers in response to compressive and tensile strain, respectively. The relationship between the morphologies of the different thin films and their corresponding piezoresistive sensitivities was discussed.
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https://hal.archives-ouvertes.fr/hal-02524574
Contributor : Damien Thuau Connect in order to contact the contributor
Submitted on : Thursday, December 3, 2020 - 12:33:38 PM
Last modification on : Friday, December 11, 2020 - 3:07:29 PM
Long-term archiving on: : Thursday, March 4, 2021 - 7:05:16 PM

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Damien Thuau, Katherine Begley, Rishat Dilmurat, Abduleziz Ablat, Guillaume Wantz, et al.. Exploring the Critical Thickness of Organic Semiconductor Layer for Enhanced Piezoresistive Sensitivity in Field-Effect Transistor Sensors. Materials, MDPI, 2020, 13, pp.1583. ⟨10.3390/ma13071583⟩. ⟨hal-02524574⟩

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