Projects per year
Abstract
Organic water-gated thin-film transistors (WG-TFTs) are of great interest in developing low-cost and high-performance biosensors. The device's sensitivity to changes in measurement conditions can impair long-term operation, and care must be taken to ensure that the WG-TFT sensor response is due to an actual biorecognition event occurring on the sensing electrode. This work aims to clarify the long-term stability of a poly-3-hexylthiophene (P3HT) WG-TFT operated intermittently over two months during 5750 measurement cycles. We have evaluated the device figures of merit (FOM), such as threshold voltage, mobility, and trap density, during the whole measurement period. Short-term changes in the FOM are mainly attributed to work function changes on the gate electrode, whereas long-term changes are consistent with an increase in the semiconductor trap density. The shift in threshold voltage and decrease in mobility are found to be linear as a function of measurement cycles and caused by electrical stress, with time immersed in water having a negligible effect on the device. The trap density-of-states estimated using the subthreshold slope is similar to earlier reported values for P3HT OFETs and exhibits a gradual increase during device use and a partial recovery after rest, indicating the formation of shorter- and longer-lived traps.
Original language | English |
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Article number | 106844 |
Number of pages | 6 |
Journal | Organic Electronics |
Volume | 120 |
DOIs | |
Publication status | Published - Sept 2023 |
MoE publication type | A1 Journal article-refereed |
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Åbo Akademi Functional Printing Center
Toivakka, M. (PI), Rosenholm, J. (PI), Anttu, N. (PI), Bobacka, J. (PI), Huynh, T. P. (PI), Peltonen, J. (PI), Wang, X. (PI), Wilen, C.-E. (PI), Xu, C. (PI), Zhang, H. (PI) & Österbacka, R. (PI)
Faculty of Science and EngineeringFacility/equipment: Facility
Projects
- 2 Finished
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SIMBIT: Single molecule bio-electronic smart system array for clinical testing
Österbacka, R. (Principal Investigator), Björkström, K. (Co-Investigator), Tewari, A. (Co-Investigator) & Macchia, E. (Co-Investigator)
01/01/19 → 31/12/22
Project: EU
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SPACE: Spatiotemporal Control of Cell Functions
Österbacka, R. (Principal Investigator), Sahlgren, C. (Co-Principal Investigator), Torsi, L. (Co-Principal Investigator) & Ghafarihashjin, A. (Co-Investigator)
01/09/18 → 31/08/22
Project: Research Council of Finland/Other Research Councils