Improving the selectivity to polar vapors of OFET-based sensors by using the transfer characteristics hysteresis response

Lienerth, Peter; Fall, Sadiara; Lévêque, P.; Soysal, Ugur; Heiser, T.

doi:10.1016/j.snb.2015.11.012

Cited by 27 publications

(24 citation statements)

References 23 publications

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“…We have also investigated the selectivity [50,51] of the porous OFET sensors. A porous OFET was tested upon exposure to different chemical vapors, ranging from 1 ppm NH 3 sensing responses.…”

Section: Resultsmentioning

confidence: 99%

Porous Organic Field‐Effect Transistors for Enhanced Chemical Sensing Performances

Lü

Liu

Zhou

et al. 2017

Adv Funct Materials

136

143

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1 of 7) 1700018 vious studies, these optimizations were usually achieved based on continuous and compact OSC thin-films, which actually limited the sensor sensitivity. The sensing response of an OFET-based sensor is usually due to the interactions of analytes with the charge carriers in OSCs conduction channel and the electrodes, such as doping or quenching induced charge carrier density variation, dipole-induced trapping and retarding of charges, and change in charge injection energy barriers. [24][25][26][27][28] These interactions lead to changes in the threshold voltage, charge mobility and output source-drain current. However, the conduction channel of an OFET is usually concentrated within a few molecular layers at the bottom of the semiconductor film, close to the dielectric/semiconductor interface, [29][30][31][32] so that the device structure of conventional OFET-based sensors with continuous and compact OSC thin-films often restricts their sensing performance. Analyte molecules have to diffuse through the organic semiconductor films before they can interact with charge carriers in the conduction channel, [33][34][35] which limits the sensor sensitivity and response speed. Although OFETs based on organic semiconductor nanowire structures have been developed, [36][37][38] the fabrication of those devices requires rather complicated techniques, and the device performances of nanowire OFETs can be quite different from batches to batches, which is not desirable for sensing applications.In this work, we have developed a general strategy with a simple and effective method to overcome this limitation. Our strategy involves incorporating ultrathin porous OSC films into OFET chemical sensors. The ultrathin micro-porous OSC films were fabricated by a versatile template method. The porous OSC structure provides additional and direct pathways for analytes to interact with charge carriers in conduction channel. As a demonstration of this strategy, OFET chemical sensors with ultrathin porous OSC films were tested upon exposure to diluted NH 3 vapors, and showed much higher sensitivity than the pristine OFET with the same OSC thickness. The porous OFET also exhibited higher sensitivity to NH 3 than any previously reported OFET sensors, [39][40][41][42][43][44][45] to the best of our knowledge, along with decent selectivity and stability. This strategy is general and simple, which can be applied to nearly all OFET chemical sensors.The thin-film structures of chemical sensors based on conventional organic field-effect transistors (OFETs) can limit the sensitivity of the devices toward chemical vapors, because charge carriers in OFETs are usually concentrated within a few molecular layers at the bottom of the organic semiconductor (OSC) film near the dielectric/semiconductor interface. Chemical vapor molecules have to diffuse through the OSC films before they can interact with charge carriers in the OFET conduction channel. It has been demonstrated that OFET ammonia sensors with porous OSC films can be fabricated by a si...

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Section: Resultsmentioning

confidence: 99%

Porous Organic Field‐Effect Transistors for Enhanced Chemical Sensing Performances

Lü

Liu

Zhou

et al. 2017

Adv Funct Materials

136

143

View full text Add to dashboard Cite

show abstract

“…19 Electrical circuits based on organic thin films and polymers are electronic devices retrieving some of their properties from the electronic structure of the molecules and they have been used for sensing applications. Polyaniline (PANI) based gas and vapor sensors 20 and poly(3hexylthiophene) (P3HT) based volatile organic compound sensors 21 are examples using this class of molecules. The sensing action in such thin film devices can have multiple origins such as changes of the conductivity of the polymer thin film by gases adsorbing onto grain boundaries, change of the spacing between polymer chains in the presence of gases or charge transfer between the gas and the molecule.…”

mentioning

confidence: 99%

A sub 20 nm metal-conjugated molecule junction acting as a nitrogen dioxide sensor

et al. 2019

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“…Polythiophene is one of the important polymer semiconductors and has received increasing attention owing to their excellent mechanical flexibility and solution processability, as well as the expressive performance in optoelectronic application. P3HT is one of the earliest semiconductor polymer materials applied in gas sensors, and it's still being studied by many research groups Majority of the research indicated that the P3HT film had good response to NH 3 , with obvious decrement of the current and shifts of the threshold voltage.…”

Section: π‐Conjugated Materials For Gas Sensorsmentioning

confidence: 99%

“…P3HT is one of the earliest semiconductor polymer materials applied in gas sensors, and it's still being studied by many research groups. [50][51][52][53][78][79][80] Majority of the research indicated that the P3HT film had good response to NH 3 , with obvious decrement of the current and shifts of the threshold voltage. The sensitivity varied with the film morphology, device structure and dielectric layer.…”

Section: Polythiophenementioning

confidence: 99%

Gas‐Sensing Performance and Operation Mechanism of Organic π‐Conjugated Materials

et al. 2019

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Organic π‐conjugated materials, which have advantages of tailorable chemical structures, solution processability, and mechanical flexibility, are promising candidates for applications in low‐cost, portable gas sensors that operate at room temperature. Nevertheless, there are still challenging issues in the development of organic semiconductor gas sensors because of issues such as relatively poor sensitivity, slow response, and low recovery. Herein, we summarize the recent progress of gas sensors based on organic conjugated materials and discuss the critical factors related to the sensor performance and the operation mechanism. We highlight six types of typical materials from small molecule to polymer semiconductors with respect to their performance in detecting different gas species through morphology control and molecular engineering. Critical factors from gas kinetics to sensor‐analyte interaction are briefly discussed, together with an examination of sensing mechanisms.

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Improving the selectivity to polar vapors of OFET-based sensors by using the transfer characteristics hysteresis response

Cited by 27 publications

References 23 publications

Porous Organic Field‐Effect Transistors for Enhanced Chemical Sensing Performances

Porous Organic Field‐Effect Transistors for Enhanced Chemical Sensing Performances

A sub 20 nm metal-conjugated molecule junction acting as a nitrogen dioxide sensor

Gas‐Sensing Performance and Operation Mechanism of Organic π‐Conjugated Materials

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