Stencil mask defined doctor blade printing of organic single crystal arrays for high-performance organic field-effect transistors

Xi, Yue; Wang, Tao; Mu, Qi; Huang, Congcong; Duan, Shuming; Ren, Xiaochen; Hu, Wenping

doi:10.1039/d1qm00097g

Cited by 12 publications

(28 citation statements)

References 61 publications

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“…As for the statistics of the ON/OFF ratio (Figure S26, Supporting Information), the values are in the narrow range of 10 7 –10 8 which is on par with the reported printed C6‐DPA‐based FET array. [ 2d ] As shown in Figure 3e, mobility is almost independent of the gate voltage, indicating the negligible influence of contact resistance and interface traps on device performance (the corresponding transfer curve is shown in Figure S27 in the Supporting Information). [ 14 ] Apart from that, the off‐state current of the device is as low as picoamperes, indicating that the leakage current in the MMC device is negligible compared with the channel current.…”

Section: Resultsmentioning

confidence: 99%

“…[ 1 ] In particular, organic single crystals based on small molecules, which have low density of defects, low structural disorder, and free‐of grain boundaries, bring a bright future to resolve the device‐to‐device variation problem in their integrations at large scale. [ 2 ] However, there are still significant challenges for the utilization of organic single crystals for electronic integrations and circuits. For example, the efficient patterning of molecular crystals is of particular importance for the fabrication of integrated electronic circuits based on organic single‐crystal field‐effect transistors (FETs).…”

Section: Introductionmentioning

confidence: 99%

“…For example, the efficient patterning of molecular crystals is of particular importance for the fabrication of integrated electronic circuits based on organic single‐crystal field‐effect transistors (FETs). [ 2g,h,3 ] Well‐patterned molecular crystals can avoid unwanted leakage current and reduce off‐state current, thereby reducing the variation in device performance, as well as the crosstalk between adjacent devices. The past several decades have witnessed their tremendous progress in the optimization of controllable growth of organic single‐crystalline arrays, and periodic distribution of the crystal pattern was successfully achieved.…”

Section: Introductionmentioning

confidence: 99%

“…The past several decades have witnessed their tremendous progress in the optimization of controllable growth of organic single‐crystalline arrays, and periodic distribution of the crystal pattern was successfully achieved. [ 2c,4 ] However, nonuniform morphology of the single‐crystal patterns with different thicknesses results in fluctuant bulk resistance and unpredictable interfacial defects and contact quality, which lead to poor uniformity in device performance. This nonuniformity becomes a bottleneck for their large‐scale integrated application, such as display drivers, radio‐frequency identification tags, and logic circuits.…”

Section: Introductionmentioning

confidence: 99%

“…This nonuniformity becomes a bottleneck for their large‐scale integrated application, such as display drivers, radio‐frequency identification tags, and logic circuits. [ 2a,d,g,3e,h,i,5 ]…”

Section: Introductionmentioning

confidence: 99%

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Capillary‐Confinement Crystallization for Monolayer Molecular Crystal Arrays

Liu

et al. 2022

Advanced Materials

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Organic single‐crystalline semiconductors are highly desired for the fabrication of integrated electronic circuits, yet their uniform growth and efficient patterning is a huge challenge. Here, a general solution procedure named the “soft‐template‐assisted‐assembly method” is developed to prepare centimeter‐scale monolayer molecular crystal (MMC) arrays with precise regulation over their size and location via a capillary‐confinement crystallization process. It is remarkable that the field‐effect mobility of the array is highly uniform, with variation less than 4.4%, which demonstrates the most uniform organic single‐crystal arrays ever reported so far. Simulations based on fluid dynamics are carried out to understand the function mechanism of this method. Thanks to the ultrasmooth crystalline orientation surface of MMCs, high‐quality p–n heterojunction arrays can be prepared by weak epitaxy growth of n‐type material atop the MMC. The p–n heterojunction field‐effect transistors show ambipolar characteristics and the corresponding inverters constructed by these heterojunctions exhibit a competitive gain of 155. This work provides a general strategy to realize the preparation and application of logic complementary circuits based on patterned organic single crystals.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Capillary‐Confinement Crystallization for Monolayer Molecular Crystal Arrays

Liu

et al. 2022

Advanced Materials

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Structures, Properties, and Device Applications for [1]Benzothieno[3,2‐b]Benzothiophene Derivatives

Xie

Liu

Sun

et al. 2022

Adv Funct Materials

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1]benzothieno[3,2-b]benzothiophene (BTBT), with two benzene rings as the outermost rings, is referred to as diacene-fused ladder-type π-conjugated thienothiophenes. During the last three decades, derivatives based on BTBT core have been extensively studied due to their tremendous application prospects in organic field-effect transistors (OFETs) and organic optoelectronic devices. In order to further advance the development of organic electronics, new materials are constantly being synthesized and new methods are constantly evolving. This review mainly focuses on the crystal and electronic structures of BTBT derivatives, the soluble and thermal properties, the fabrication methods, as well as the strategies for performance improvement and optoelectronic applications including OFETs, photodetectors, synaptic devices, and organic light-emitting transistors. As one of the most promising organic materials, the insight into BTBT-based molecules will accelerate their potential application and provide important reference value for the development toward commercialized and industrialized organic semiconducting products.

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Organic Semiconductor Crystal Engineering for High‐Resolution Layer‐Controlled 2D Crystal Arrays

et al. 2021

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2D organic semiconductor crystals (2DOSCs) have extraordinary charge transport capability, adjustable photoelectric properties, and superior flexibility, and have stimulated continuous research interest for next‐generation electronic and optoelectronic applications. The prerequisite for achieving large‐area and high‐throughput optoelectronic device integration is to fabricate high‐resolution 2DOSC arrays. Patterned substrate‐ and template‐assisted self‐assembly is an effective strategy to fabricate OSC arrays. However, the film thickness is difficult to control due to the complicated crystallization process during solvent evaporation. Therefore, the manufacturing of 2DOSC arrays with high‐resolution and controllable molecular‐layer numbers through solution‐based patterning methods remains a challenge. Herein, a two‐step strategy to produce high‐resolution layer‐controlled 2DOSC arrays is reported. First, large‐scale 2DOSCs with well‐defined layer numbers are obtained by a solution‐processed organic semiconductor crystal engineering method. Next, the high‐resolution layer‐controlled 2DOSC arrays are fabricated by a polydimethylsiloxane mold‐assisted selective contact evaporation printing technique. The organic field‐effect transistors (OFETs) based on 2DOSC arrays have high electrical performance and excellent uniformity. The 2,6‐bis(4‐hexylphenyl)anthracene 2DOSC arrays‐based OFETs have a small variation of 12.5% in mobility. This strategy can be applied to various organic semiconductors and pattern arrays. These demonstrations will offer more opportunities for 2DOSCs for integrated optoelectronic devices.

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Stencil mask defined doctor blade printing of organic single crystal arrays for high-performance organic field-effect transistors

Abstract: Organic field-effect transistor (OFET) is one of the promising candidates for next generation electronics due to its solution processability and good performance superior to amorphous Si devices. Patterning the organic...

Cited by 12 publications

References 61 publications

Capillary‐Confinement Crystallization for Monolayer Molecular Crystal Arrays

Capillary‐Confinement Crystallization for Monolayer Molecular Crystal Arrays

Structures, Properties, and Device Applications for [1]Benzothieno[3,2‐b]Benzothiophene Derivatives

Organic Semiconductor Crystal Engineering for High‐Resolution Layer‐Controlled 2D Crystal Arrays

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