A Comparative Study of the Gas Sensing Behavior in P3HT- and PBTTT-Based OTFTs: The Influence of Film Morphology and Contact Electrode Position

Manoli, Kyriaki; Dumitru, Liviu Mihai; Mulla, Mohammad Yusuf; Magliulo, Maria; Franco, Cinzia Di; Santacroce, Maria Vittoria; Scamarcio, Gaetano; Torsi, Luisa

doi:10.3390/s140916869

Cited by 38 publications

(44 citation statements)

References 28 publications

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“…The hole transporting semiconducting polymer regioregular poly(3-hexyl)thiophene (rrP3HT) was purchased from Aldrich (Cat No 698989, electronic grade 99.995% trace metal basis), dissolved at 4 mg/mL in toluene solution, heated gently at 75 °C for ≈ 10 min, and spin cast onto contact substrates at 2000 rpm for 60 s. After casting, films were dried under dynamic vacuum at 120 °C for 1 h. The semicrystalline morphology of rrP3HT films used in sensors has been studied in detail before, e.g. [27][28][29]. Zinc oxide films were prepared by spraying 3 'puffs' of 100 mM ZnCl 2 solution in DI water onto similar TFT substrates heated to 400 °C o on a hotplate, which leads to the formation of semiconducting ZnO films('spray pyrolysis', more processing details in [30]).…”

Section: Methodsmentioning

confidence: 99%

Comparing electron- and hole transporting semiconductors in ion sensitive water- gated transistors

Baroot

Grell

2019

Materials Science in Semiconductor Processing

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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 capacitive amplification/attenuation effect. Our study suggests that the optimum semiconductor material for ion-selective WGTFTs would be a precursor-route inorganic hole transporting semiconductor.

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Section: Methodsmentioning

confidence: 99%

Comparing electron- and hole transporting semiconductors in ion sensitive water- gated transistors

Baroot

Grell

2019

Materials Science in Semiconductor Processing

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“…1) are two of the most studied semiconductor polymers having a wide range of applications ranging from organic thin-film transistors (OTFTs), solar cells, light emitting diodes to biosensors. [1][2][3][4][5][6] In particular, they are successfully used as the organic semiconductor layer (OSL) in the OTFTs. The performances of OTFTs are typically evaluated in terms of the mobility of charge carriers and are strongly affected by the morphology and the molecular order of the OSL.…”

Section: Introductionmentioning

confidence: 99%

Morphological and charge transport properties of amorphous and crystalline P3HT and PBTTT: insights from theory

Alberga

Perrier

Ciofini

et al. 2015

Phys. Chem. Chem. Phys.

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We explore the relation between the morphological and the charge transport properties of poly(3-hexylthiophene) (P3HT) and poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) semiconductor polymers in both amorphous and crystalline phases. Using molecular dynamics to simulate bulk supercells and the Marcus theory to analyze the transport properties we found that amorphous systems display a reduced hole mobility due to the loss of nematic order and π-π stacking leading to a reduction in the electronic coupling between two chains. In the crystal phase, PBTTT displays a larger charge mobility than P3HT due to the interdigitation of the side chains enhancing the stability of the conjugated rings on the backbones. This more stable π-π stacking reduces the energetic disorder with respect to P3HT and increases the electronic coupling. In contrast, in the amorphous phase, PBTTT displays a reduced charge mobility with respect to P3HT due to the absence of side chains attached to the thienothiophenes, which increases their fluctuations and the energetic disorder. In addition, we show that it is possible to calculate the reorganization energy neglecting the side chains of the polymers and thus saving computational time. Within this approximation, we obtained mobility values matching the experimental measurements, thus confirming that the side chains are crucial to shape the morphology of the polymeric systems but are not involved in the charge transport process.

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“…pBTTT has recently attracted attention as another promising solution-processed semiconducting polymer. pBTTT shows better performances than P3HT (hole mobility up to 1.0 cm 2 /Vs for pBTTT versus 0.1 cm 2 /Vs for P3HT [97,98]), less electrochemical doping and much better stability in aqueous environment [53,99].…”

Section: Poly(25-bis(3-alkylthiophen-2-yl)thieno[32-b]-thiophene) (mentioning

confidence: 99%

Electrolytic Gated Organic Field-Effect Transistors for Application in Biosensors—A Review

2016

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Electrolyte-gated organic field-effect transistors have emerged in the field of biosensors over the last five years, due to their attractive simplicity and high sensitivity to interfacial changes, both on the gate/electrolyte and semiconductor/electrolyte interfaces, where a target-specific bioreceptor can be immobilized. This article reviews the recent literature concerning biosensing with such transistors, gives clues to understanding the basic principles under which electrolyte-gated organic field-effect transistors work, and details the transduction mechanisms that were investigated to convert a receptor/target association into a change in drain current.

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A Comparative Study of the Gas Sensing Behavior in P3HT- and PBTTT-Based OTFTs: The Influence of Film Morphology and Contact Electrode Position

Cited by 38 publications

References 28 publications

Comparing electron- and hole transporting semiconductors in ion sensitive water- gated transistors

Comparing electron- and hole transporting semiconductors in ion sensitive water- gated transistors

Morphological and charge transport properties of amorphous and crystalline P3HT and PBTTT: insights from theory

Electrolytic Gated Organic Field-Effect Transistors for Application in Biosensors—A Review

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