Poly(α-methyl styrene) polymer additive for organic thin film transistors

Zhang, Ziyang; Asare‐Yeboah, Kyeiwaa; Bi, Sheng; He, Zhengran

doi:10.1007/s10854-021-07586-8

Cited by 6 publications

(3 citation statements)

References 121 publications

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“…Due to the carbon-carbon triple bonds, the TIPS pentacene's bulky side group is forced away from the backbones, resulting in face-to-face interaction π-π stacking. When compared to pentacene, the π-π stacking of TIPS pentacene molecules significantly improves charge transport [6]. The fabrication method is important because it affects mobility values.…”

Section: Fig 3 Benchmark Mq2 Gas Sensor Performance [5]mentioning

confidence: 99%

Experimental Characterisation of BGBC OTFT for Indoor CO<sub>2</sub> Gas Sensing

Zailan,

Ismail,

Syaripuddin

et al. 2024

KEM

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Global warming is a concern nowadays due to excessive release of harmful gasses to the environment, leading to greenhouse effect phenomena worldwide. Based on the data provided by global pollution agencies, the release of greenhouse gasses to the atmosphere is the main cause of pollution and the increase in atmospheric temperature due to warming. Greenhouse gasses (GHGs) contents released to the environment is worrying, with carbon dioxide (CO2) is reported at the highest concentration compared to other gasses. There are many studies conducted to develop and evaluate the performance of harmful gas sensors incorporating inorganic and organic semiconductive materials. Organic semiconductors (OSCs) are environmentally friendly materials, relatively cheaper technology, and comprised of a wide range of materials with good carrier mobility. Therefore, in this work, Organic Thin Film Transistor (OTFT) is developed for gas sensor application. As global warming is becoming more serious, this solution is instead a sustainable solution to the environment, as organic molecules which are held together via Van der Waals bond are easily processed via low-temperature deposition and solution processing as compared to more complicated processes involved in conventional inorganic counterpart. In addition, the developed sensor is generally robust due to the ability to withstand high humidity conditions and can be fabricated on flexible substrates. In this work, suitable materials are identified in basic OTFT construction, which are the electrodes, dielectric and substrate. The scope is mainly focusing on the development of bottom gate OTFT construction, incorporating p-type active material which are Trisisopropylsilylethynyl Pentacene (TIPS Pentacene), Aluminium (Al) as drain and source electrodes, PEDOT: PSS as gate electrode and Polyvinyl alcohol (PVA) as gate dielectric. The materials in bottom gate bottom contact (BGBC) configuration, fabricated via screen printing technique is experimentally tested towards CO2 detection. CO2 is initially detected at 1618 ppm with contact resistance of 15 kΩ, and at 10 ml/minute flow rate, the developed configuration is demonstrated able to achieve sensitivity of 2.069 Ω/ppm. In conclusion, the studied BGBC OTFT has demonstrated suitability and applicability in CO2 gas sensing for sustainable environmental condition monitoring, that could lead to safer environment for the living things on earth. With the proposed dimensions, in the future it is possible to proceed with this work to be fabricated by using more advanced techniques such as photolithography and many others.

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Section: Fig 3 Benchmark Mq2 Gas Sensor Performance [5]mentioning

confidence: 99%

Experimental Characterisation of BGBC OTFT for Indoor CO<sub>2</sub> Gas Sensing

Zailan,

Ismail,

Syaripuddin

et al. 2024

KEM

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“…One successful pathway to obtain a desirable morphology is to mix organic semiconductors with polymer additives. 56,57 Amorphous polymers including poly(a-methylstyrene) (PaMS), [58][59][60][61][62] poly(methyl methacrylate) (PMMA), [63][64][65][66][67][68] polystyrene (PS), [69][70][71][72][73][74] and poly(triaryl)amine (PTAA) [75][76][77][78][79] can both improve the semiconductor film uniformity and induce a vertically phase-separated active layer structure. This further forms a semiconductor sublayer with an elevated semiconductor concentration at the dielectric layer interface, 80,81 and/or a polymer encapsulation layer at the air interface, 82,83 which favors the charge transport and air stability of the transistor device.…”

Section: Background and Challengesmentioning

confidence: 99%

Binary solvent engineering for small-molecular organic semiconductor crystallization

Zhang

Asare‐Yeboah

et al. 2023

Mater. Adv.

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“…In recent years, research in solution-processed small-molecular organic semiconductors has gained rapid progress in both charge carrier mobilities [1][2][3][4][5][6][7] and ambient air stabilities. [8][9][10] By means of polymer additive [11][12][13][14][15][16][17][18][19] or dielectric layer engineering, [20][21] various solution processed semiconducting small molecules, such as diketopyrrolopyrrole based organic semiconductors, [22][23][24] 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene), [25][26][27][28][29][30] and 2,7-dioctyl [1] benzothieno [3,2-b] [1] benzothiophene (C 8 -BTBT), [31][32][33][34][35][36] have been reported with mobilities that reach or even transcend the mobility of amorphous silicon. [37][38] Besides, the thin film transistors comprising these organic semiconductors as active layers have shown remarkable enhancement in both electrical and operational stability during prolonged exposure to bias stress, [39][40] ambient environment,…”

Section: Introductionmentioning

confidence: 99%

A Green Binary Solvent Method to Control Organic Semiconductor Crystallization

Sun

Zhou

et al. 2023

ChemistrySelect

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While solution‐processed small‐molecular organic semiconductors have been reported with significant research progress, their random crystal orientations and abundant defects at grain boundaries remain as a major obstacle to achieving high performance in organic electronic devices. In this paper, we demonstrate a binary solvent method that comprises a green solvent to manipulate the crystal alignment, morphology and charge transport of organic semiconductors. 6,13‐bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) was studied as an example to showcase the enlargement of grain width and millimeter‐scale alignment of organic crystals based on the toluene/n‐amyl acetate binary solvents. At an optimized volume ratio of 3 : 1, the toluene/n‐amyl acetate binary solvent gave rise to a 4‐fold reduction in misorientation angle and approximately 40 % increase in the grain width. UV‐visible spectroscopy confirmed strong H‐aggregations with more favorable intrachain interaction and charge transport in TIPS pentacene. X‐ray diffraction showed enhanced peak intensities in (00 l) type of reflections and improved film crystallinity. Finally, thin film transistors were demonstrated to test the charge transport in the TIPS pentacene organic crystals. This work demonstrates the binary green solvent method can effectively regulate the organic semiconductor crystallization and alignment even in the absence of external alignment techniques such as solution shearing, and thereby sheds light on advancing facile organic electronic applications.

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Poly(α-methyl styrene) polymer additive for organic thin film transistors

Cited by 6 publications

References 121 publications

Experimental Characterisation of BGBC OTFT for Indoor CO<sub>2</sub> Gas Sensing

Experimental Characterisation of BGBC OTFT for Indoor CO<sub>2</sub> Gas Sensing

Binary solvent engineering for small-molecular organic semiconductor crystallization

A Green Binary Solvent Method to Control Organic Semiconductor Crystallization

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