Al Baroot, A.F. and Grell, M. orcid.org/0000-0003-0714-2039 (2019) Comparing electron- and hole transporting semiconductors in ion sensitive water- gated transistors. Materials Science in Semiconductor Processing, 89. pp. 216-222. ISSN 1369-8001
Abstract
We present a systematic study comparing different solution- processed semiconductors in cation- sensitive water- gated thin film transistors (WGTFTs): A hole transporting semiconducting polymer (rrP3HT), and an electron- transporting precursor- route metal oxide (ZnO). To allow comparison, we used the same ionophore to sensitise the gate contact for both semiconductors. We find both organic hole transporter, and inorganic electron transporter, have their relative merits, and drawbacks, in ion- sensitive WGTFTs. Hole transporting rrP3HT WGTFTs show low hysteresis under water- gating and give super- Nernstian sensitivity. However, rrP3HT responds to ionic strength in water even when WGTFTs are not sensitised, compromising selectivity. Electron transporting ZnO WGTFTs show higher mobility, but also stronger hysteresis, and sub- Nernstian response. However, ZnO WGTFTs show little response to ionic strength when not sensitised. We rationalise the super- versus- sub- Nernstian sensitivities via a capacitative amplification/attenuation effect. Our study suggests that the optimum semiconductor material for ion- selective WGTFTs would be a precursor- route inorganic hole transporting semiconductor.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Crown Copyright © 2018 Elsevier. This is an author produced version of a paper subsequently published in Materials Science in Semiconductor Processing. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Water- gated thin film transistor; rrP3HT; Zinc oxide; Crown ether; Potassium |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Oct 2018 14:12 |
Last Modified: | 27 Sep 2019 00:38 |
Published Version: | https://doi.org/10.1016/j.mssp.2018.09.018 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.mssp.2018.09.018 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:136326 |