Solution-grown small-molecule organic semiconductor with enhanced crystal alignment and areal coverage for organic thin film transistors

Bi, Sheng; He, Zhengran; Chen, Jihua; Li, Dawen

doi:10.1063/1.4927577

Cited by 47 publications

(27 citation statements)

References 38 publications

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“…The main advantage of this configuration is their efficiency concerning the ratio between the transistor surface and the transistor width [40]. However, such geometry is not entirely satisfactory in terms of performance since great efforts were made to enhance the alignment of OSC crystal perpendicularly along the Drain and Source (D/S) electrodes during the OSC deposition such as undergoing a nitrogen flow, temperature, and varying the solvent nature and ratio [41][42][43]. In order to overcome this limitation and for the sake of fabrication simplicity, OTFTs with circular channel, called Corbino OTFTs, are commonly proposed.…”

Section: Interdigitated and Corbino Otftsmentioning

confidence: 99%

Monotype Organic Dual Threshold Voltage Using Different OTFT Geometries

Arnal

Martínez‐Domingo

Ogier³

et al. 2019

Crystals

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It is well known that organic thin film transistor (OTFT) parameters can be shifted depending on the geometry of the device. In this work, we present two different transistor geometries, interdigitated and Corbino, which provide differences in the key parameters of devices such as threshold voltage (VT), although they share the same materials and fabrication procedure. Furthermore, it is proven that Corbino geometries are good candidates for saturation-mode current driven devices, as they provide higher ION/IOFF ratios. By taking advantage of these differences, circuit design can be improved and the proposed geometries are, therefore, particularly suited for the implementation of logic gates. The results demonstrate a high gain and low hysteresis organic monotype inverter circuit with full swing voltage at the output.

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Section: Interdigitated and Corbino Otftsmentioning

confidence: 99%

Monotype Organic Dual Threshold Voltage Using Different OTFT Geometries

Arnal

Martínez‐Domingo

Ogier³

et al. 2019

Crystals

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“…Whilst the highest charge carrier mobilities in small molecule organic semi-conductors (OSC) have been obtained from single crystal studies [1], the performance of solution grown crystalline thin films have improved dramatically over recent years [2,3]. These improvements in Organic Field Effect Transistor ((OFET) device performance have been brought about in the main by a greater understanding on the role of morphology and molecular alignment in the charge transfer efficiency of thin films [4][5][6][7]. Morphology control strategies for solution processing OSC thin films have recently been reviewed [8], with a focus on three distinct aspects: control of nucleation, crystal growth, and domain alignment, with particular emphasis on methods that exploit the unique characteristics of solution processing.…”

Section: Introductionmentioning

confidence: 99%

The synergistic role of azeotropic solvent mixtures and atactic polystyrene on the morphology, crystallization and field effect mobility of thin film 6,13-bis(triisopropylsilylethynyl)-pentacene based semiconductors

Abdullah

Morrison

et al. 2018

J Mater Sci: Mater Electron

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The effect of anisole / decane binary solvent mixture and the subsequent addition of low wt-% aPS on 6,13-bis(triisopropylsilylethynyl-pentacene (TIPS-pentacene) thin film morphology is investigated by optical microscopy, AFM and UV-vis measurements. We show that, over the composition range anisole/decane of 96/4 to 85/15 wt-%, the solution maintains an azeotropic composition with the boiling point of the binary mixture remaining constant at 152 °C, and the solvent composition remaining constant during evaporation and drying. It was found that addition of up to 20 wt-% decane has little impact on micro-scale crystal morphology but has a significant influence on the growth mode and terrace roughness. The formation of large crystals is explained in terms of the change in solvent, increase in decane content, weakening the solute-solvent interactions and promoting efficient nucleation of the favoured H-aggregates of TIPS-pentacene. The effect of the TIPS-pentacene-aPS ratio up to 20 wt-% for drop-cast thin film was similarly investigated. It is found that addition of aPS has a significant effect on both macroscopic crystal properties such as surface coverage, unity of orientation and long range order. It also changes the surface morphology and layer ordering on the nano-scale.

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“…These effects synergistically attribute to the enhanced crystal alignment, improved film coverage, and enlarged crystal size of TIPS pentacene. Unlike conjugated polymers, which promote π–π interactions and cocrystallization with the organic semiconductor [ 60 , 61 , 62 ], the PFS eliminates such complicated processes, which can be otherwise undesirable for many facile processes. Furthermore, in Table 1 , we summarize miscellaneous properties of PFS [ 63 , 64 , 65 ] and compare them with those of PS.…”

Section: Resultsmentioning

confidence: 99%

Polyferrocenylsilane Semicrystalline Polymer Additive for Solution-Processed p-Channel Organic Thin Film Transistors

Zhang

Asare‐Yeboah

et al. 2021

Polymers

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In this study, we demonstrated for the first time that a metal-containing semicrystalline polymer was used as an additive to mediate the thin film morphology of solution-grown, small-molecule organic semiconductors. By mixing polyferrocenylsilane (PFS) with an extensively-studied organic semiconductor 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene), PFS as a semicrystalline polymer independently forms nucleation and crystallization while simultaneously ameliorating diffusivity of the blend system and tuning the surface energies as a result of its partially amorphous property. We discovered that the resultant blend film exhibited a 6-fold reduction in crystal misorientation angle and a 3-fold enlargement in average grain width. Enhanced crystal orientation considerably reduces mobility variation, while minimized defects and trap centers located at grain boundaries lessen the adverse impact on the charge transport. Consequently, bottom-gate, top-contact organic thin film transistors (OTFTs) based on the TIPS pentacene/PFS mixture yielded a 40% increase in performance consistency (represented by the ratio of average mobility to the standard deviation of mobility). The PFS semicrystalline polymer-controlled crystallization can be used to regulate the thin film morphology of other high-performance organic semiconductors and shed light on applications in organic electronic devices.

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Solution-grown small-molecule organic semiconductor with enhanced crystal alignment and areal coverage for organic thin film transistors

Cited by 47 publications

References 38 publications

Monotype Organic Dual Threshold Voltage Using Different OTFT Geometries

Monotype Organic Dual Threshold Voltage Using Different OTFT Geometries

The synergistic role of azeotropic solvent mixtures and atactic polystyrene on the morphology, crystallization and field effect mobility of thin film 6,13-bis(triisopropylsilylethynyl)-pentacene based semiconductors

Polyferrocenylsilane Semicrystalline Polymer Additive for Solution-Processed p-Channel Organic Thin Film Transistors

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