Multifunctional sensor based on organic field-effect transistor and ferroelectric poly(vinylidene fluoride trifluoroethylene)

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Hannah, Stuart and Davidson, Alan and Glesk, Ivan and Uttamchandani, Deepak and Dahiya, Ravinder and Gleskova, Helena (2018) Multifunctional sensor based on organic field-effect transistor and ferroelectric poly(vinylidene fluoride trifluoroethylene). Organic Electronics, 56. pp. 170-177. ISSN 1566-1199 (https://doi.org/10.1016/j.orgel.2018.01.041)

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Abstract

A multifunctional sensor that responds to all – static/quasi-static or dynamic temperature or force – is reported. The sensor is based on a ferroelectric poly(vinylidene fluoride trifluoroethylene) (P(VDF-TrFE)) capacitor connected to the gate of organic field-effect transistor (OFET). Both, the P(VDF-TrFE) capacitance and the output voltage of the P(VDF-TrFE)/OFET sensor exhibit a logarithmic response to static compressive force, leading to higher sensitivity for small forces. In addition, both the P(VDF-TrFE) capacitance and the output voltage of the P(VDF-TrFE)/OFET sensor exhibit a linear dependence on the static/constant temperature. Response to static force or temperature is observed irrespective of whether P(VDF-TrFE) is in ferroelectric or paraelectric states, confirming that piezo/pyroelectricity is not essential when monitoring static events. The piezo/pyroelectricity become activated during dynamic events (dynamic force or temperature) when the ferroelectric P(VDF-TrFE)/OFET sensor is used. The obtained results indicate different sensing mechanisms for static and dynamic stimuli. Consequently, by choosing P(VDF-TrFE) layers in ferroelectric or paraelectric states a route for differentiating between the static and dynamic stimuli may exist.

ORCID iDs

Hannah, Stuart ORCID logoORCID: https://orcid.org/0000-0001-5620-9899, Davidson, Alan ORCID logoORCID: https://orcid.org/0000-0003-0510-0185, Glesk, Ivan ORCID logoORCID: https://orcid.org/0000-0002-3176-8069, Uttamchandani, Deepak ORCID logoORCID: https://orcid.org/0000-0002-2362-4874, Dahiya, Ravinder and Gleskova, Helena ORCID logoORCID: https://orcid.org/0000-0001-7195-9639;
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