Printed Thin-Film Transistors: Research from China

Tong, Shuang; Sun, Jia; Yang, Junliang

doi:10.1021/acsami.7b16413

Cited by 70 publications

(41 citation statements)

References 226 publications

(382 reference statements)

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“…Decrease in transistor performance is observed, with PDBD‐Se's p‐type/n‐type mobility extracted to be 4.73/2.55 cm 2 V −1 s −1 , respectively (Figure S12, Supporting Information). However, this is the highest performance metrics for inkjet‐printed ambipolar OFETs to date …”

Section: Physical Properties Of Pdbds and Their Dpp Analoguesmentioning

confidence: 99%

Ambipolar Conjugated Polymers with Ultrahigh Balanced Hole and Electron Mobility for Printed Organic Complementary Logic via a Two‐Step CH Activation Strategy

Wang

Zhao

et al. 2019

Advanced Materials

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High mobility ambipolar conjugated polymers are seriously absent regardless their great potential for flexible and printed plastic devices and circuits. Here, ambipolar polymers with ultrahigh balanced hole and electron mobility are developed via a two‐step CH activation strategy. Diketopyrrolopyrrole‐benzothiadiazole‐diketopyrrolopyrrole (DBD) and its copolymers with thiophene/selenophene units (short as PDBD‐T and PDBD‐Se) are used as examples. PDBD‐Se exhibits highly efficient ambipolar transport with hole and electron mobility up to 8.90 and 7.71 cm2 V−1 s−1 in flexible organic field‐effect transistors, presenting a milestone for ambipolar copolymer screening. Based on this performance metrics and good solubility, PDBD‐Se is investigated as inkjet‐printable semiconductor ink for organic complementary logic circuits. Under ambient processing, maximum hole and electron mobilities reach 6.70 and 4.30 cm2 V−1 s−1, respectively. Printed complementary inverter and NAND gates with transition voltages near VDD/2 are fabricated, providing an easy‐handling, general material for printed electronics and logic.

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Section: Physical Properties Of Pdbds and Their Dpp Analoguesmentioning

confidence: 99%

Ambipolar Conjugated Polymers with Ultrahigh Balanced Hole and Electron Mobility for Printed Organic Complementary Logic via a Two‐Step CH Activation Strategy

Wang

Zhao

et al. 2019

Advanced Materials

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“…However, the commonly used printing techniques, including inkjet printing, [ 11 ] gravure printing, [ 12,13 ] and screen printing, [ 14,15 ] have limited scalability and resolution (micro or sub‐micro scale). [ 16,17 ] Directed‐assembly‐based printing, on the other hand, is scalable and can realize high resolution of tens of nanometers. [ 18,19 ] Directed assembly is achieved by applying external fields such as electric, [ 20–22 ] magnetic, [ 23,24 ] optical, [ 25–27 ] and flow fields [ 28–30 ] on nanoelements and guiding the nanoelements to targeted sites to form functional structures.…”

Section: Figurementioning

confidence: 99%

High‐Rate Printing of Micro/Nanoscale Patterns Using Interfacial Convective Assembly

et al. 2020

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Electric-field-directed assembly [31,32] uses electrophoretic and dielectrophoretic forces to direct nanoelements. Although electric-field-directed assembly demonstrates high throughput, high scalability, and high resolution in assembling various nanomaterials, conductive substrates are required to generate electric field, which limits potential applications of printed structures in electronic devices. Fluidicflow-directed assembly such as convective [33][34][35] and capillary [36][37][38] assembly utilizes solvent evaporation-induced convective flow to guide and position nanoelements. Unlike electric-field-directed assembly, fluidic-flow-directed assembly is applicable to all kinds of substrates (both insulating and conductive). However, it takes hours to assemble over centimetersized substrates. Therefore, the scalability and throughput of this assembly process is a major challenge. Photothermally directed assembly uses photothermaleffect-induced Rayleigh-Benard [39] and/or Marangoni [40][41][42] convective flow to direct assembly. Similar to fluidic-flow-directed assembly, photothermally directed assembly suffers from scalability and throughput issues due to its serial processing nature. In addition, photothermally directed assembly has a limited resolution of micro or sub-micro scale. [43,44] Therefore, the development of a broadly applicable, highly scalable, high throughput, and high resolution printing technique is highly desirable.Here, we report a novel fluidic-flow-directed assembly technique, interfacial convective assembly, to rapidly assemble particles in pattern areas on any substrates. In the interfacial convective assembly, a patterned substrate is initially sonicated in isopropyl alcohol (IPA) using a bath type sonicator for a few seconds. With a low surface tension, IPA helps wet as well as remove trapped air in the patterned structures. After sonication, the substrate is removed from the IPA bath, leaving a thin IPA film on the substrate. Afterward, 50 µL aqueous particle suspension is drop casted on the IPA film. The particle suspension immediately mixes with the IPA film, resulting a suspension with ≈20 wt% IPA. Then, a glass slide is covered on the suspension, creating a confined environment with the substrate via a 300 µm thick spacer (Figure 1a). Finally, the setup is placed onto a hot plate with preheated temperatures between 40 and 75 °C. The substrate is heated up, inducing a convective flow. Due to the convective flow, particles are carried toward Printing of electronics has been receiving increasing attention from academia and industry over the recent years. However, commonly used printing techniques have limited resolution of micro-or sub-microscale. Here, a directed-assembly-based printing technique, interfacial convective assembly, is reported, which utilizes a substrate-heating-induced solutal Marangoni convective flow to drive particles toward patterned substrates and then uses van der Waals interactions as well as geometrical confinement to trap the particles in the pattern area...

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“…To date, solution processes have been widely used for fabricating QD films because they involve mild conditions and easy operation, such as contact printing, spin coating, screen printing, roll‐to‐roll coating, blade coating, inkjet printing, and others . However, these approaches normally suffer from the limitations of either high‐cost or low film quality.…”

Section: Summary Of the Performance Of The As‐prepared Qled Devices (mentioning

confidence: 99%

Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High‐Performance QLEDs

Zhang

et al. 2019

Advanced Materials

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Solution processing is widely used for preparing quantum dot (QD) films for fabricating QD light‐emitting diode display (QLED) devices. However, current approaches suffer from either the coffee‐ring effect or a large amount of wasted solution, leading to low performance and high cost. Here, a facile approach guided by a fibrous liquid bridge is developed for the continuous and controllable transfer of QD solution into ultrasmooth films by using a taut fiber with its two ends placed into capillary tubes. Guided along the fiber, a liquid bridge is formed between the horizontal fiber and the substrate, with a large mass of liquid steadily being held within the vertically placed tubes. Directionally moving the liquid bridge generates a high‐quality QD film on the substrate. Particularly, the liquid consumption is quantitative, namely, in proportion to the area of the as‐prepared film. Moreover, multilayered ultrasmooth red/green/blue QD films are prepared by multiple transfers of liquid onto the same targeted area in sequence. The as‐prepared white QLEDs show a rather high performance with a maximum luminance of 57 190 cd m−2 and a maximum current efficiency of 15.868 cd A−1. It is envisioned that this strategy offers new perspectives for the low‐cost fabrication of high‐performance QLED devices.

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Printed Thin-Film Transistors: Research from China

Cited by 70 publications

References 226 publications

Ambipolar Conjugated Polymers with Ultrahigh Balanced Hole and Electron Mobility for Printed Organic Complementary Logic via a Two‐Step CH Activation Strategy

Ambipolar Conjugated Polymers with Ultrahigh Balanced Hole and Electron Mobility for Printed Organic Complementary Logic via a Two‐Step CH Activation Strategy

High‐Rate Printing of Micro/Nanoscale Patterns Using Interfacial Convective Assembly

Continuous and Controllable Liquid Transfer Guided by a Fibrous Liquid Bridge: Toward High‐Performance QLEDs

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