All‐additive ink‐jet‐printed display backplanes: Materials development and integration

Arias, Ana Claudia; Daniel, Jürgen; Krusor, B. S.; Ready, S. E.; Sholin, Veronica; Street, R. A.

doi:10.1889/1.2759554

Cited by 48 publications

(48 citation statements)

References 23 publications

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“…Abdou et al [43] studied the interaction of oxygen with conjugated polymers and observed that oxygen forms a reversible charge transfer complex (CTC) with the polymer. It was suggested that CTC is largely responsible for the generation of charge carriers in semiconducting π-conjugated polymers when exposed to air, which modulated the electronic properties of the polymer.…”

Section: N-type Semiconductorsmentioning

confidence: 99%

“…Analysis of P3HT OTFTs under increasing pressures of oxygen revealed that the formation of CTC resulted in an increase in carrier concentration, increase in conductivity, and decrease in charge carrier mobility. With prolonged or higher intensity exposure of oxygen, the proper transistor behavior was lost [43]. The degree of carrier generation by oxidative doping upon air exposure is expected to increase as the ionization potential (IP) of the polymer is lowered.…”

Section: N-type Semiconductorsmentioning

confidence: 99%

“…Researchers at Palo Alto Research Center (PARC) reported jet printed polythiophene OTFTs with mobility (0.1 cm 2 /V-s) comparable to spin-coated devices [43]. Thus, with technological optimization and precise control of the printing parameters, high performance inkjet printed OTFTs can be delivered.…”

Section: Hybrid Photolithography-inkjet Printing Scheme For Fullypattmentioning

confidence: 99%

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Organic Thin Film Transistor Integration

Li¹

2011

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This thesis examines strategies to exploit existing materials and techniques to advance organic thin film transistor (OTFT) technology in device performance, device manufacture, and device integration. To enhance device performance, optimization of plasma enhanced chemical vapor deposited (PECVD) gate dielectric thin film and investigation of interface engineering methodologies are explored. To advance device manufacture, OTFT fabrication strategies are developed to enable organic circuit integration. Progress in device integration is achieved through demonstration of OTFT integration into functional circuits for applications such as active-matrix displays and radio frequency identification (RFID) tags.OTFT integration schemes featuring a tailored OTFT-compatible photolithography process and a hybrid photolithography-inkjet printing process are developed. They enable the fabrication of fully-patterned and fully-encapsulated OTFTs and circuits. Research on improving device performance of bottom-gate bottom-contact poly(3,3′′′-dialkyl-quarterthiophene) (PQT-12) OTFTs on PECVD silicon nitride (SiN x ) gate dielectric leads to the following key conclusions: (a) increasing silicon content in SiN x gate dielectric leads to enhancement in field-effect mobility and on/off current ratio; (b) surface treatment of SiN x gate dielectric with a combination of O 2 plasma and octyltrichlorosilane (OTS) selfassembled monolayer (SAM) delivers the best OTFT performance; (c) an optimal O 2 plasma treatment duration exists for attaining highest field-effect mobility and is linked to a "turnaround" effect; and (d) surface treatment of the gold (Au) source/drain contacts by 1-octanethiol SAM limits mobility and should be omitted. There is a strong correlation between the electrical characteristics and the interfacial characteristics of OTFTs. In particular, the device mobility is influenced by the interplay of various interfacial mechanisms, including surface energy, surface roughness, and chemical composition.Finally, the collective knowledge from these investigations facilitates the integration of OTFTs into organic circuits, which is expected to contribute to the development of new generation of all-organic displays for communication devices and other pertinent applications. A major outcome of this work is that it provides an economical means for organic transistor and circuit integration, by enabling use of the well-established PECVD infrastructure, yet not compromising the performance of electronics.iv

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Section: N-type Semiconductorsmentioning

confidence: 99%

Section: N-type Semiconductorsmentioning

confidence: 99%

Section: Hybrid Photolithography-inkjet Printing Scheme For Fullypattmentioning

confidence: 99%

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Organic Thin Film Transistor Integration

Li¹

2011

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“…Printed electronics are gaining attention as a technology that enables various electric devices such as organic thin film transistors (OTFTs) [1,2,3], RF-ID tags [4] and sensors [5] to be fabricated using printing process. Printing method has potential of low cost, low environmental impact and large area fabrication.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of All-printed Organic TFT Array on Flexible Substrate

Suzuki¹,

Yutani²,

Nakashima³

et al. 2011

J. Photopol. Sci. Technol.

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The surface energy controlled ink-jet printing with ultraviolet (UV) irradiation on a novel polyimide film was developed for high-resolution electrode patterning. Minimum linewidth of electrode was 15 µm and minimum space between two electrodes was 2 µm respectively. 160 ppi and 200 ppi all-printed organic thin film transistor (OTFT) backplanes were fabricated by the surface energy controlled ink-jet printing for electrodes, conventional ink-jet printing for organic semiconductor (OSC) and several printing methods on plastic substrate. We have also fabricated a 300 ppi all-printed OTFT array on plastic substrate. Flexible electrophoretic displays (EPDs) driven by 200 ppi all-printed OTFT backplanes were also successfully demonstrated.

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“…This is evident also as thick rings at the edges of the drop, commonly referred to as the "coffee-stain" effect [14,15]. The starting point is the research done by research groups [11][12][13][14]16,17] to solve this problem by use of a mixed solvent system. By using a mixed solvent system besides the existence of a convective flow in the drying droplet, there is the creation of a Marangoni flow due to the difference in boiling points and surface tension of the solvents.…”

Section: Introductionmentioning

confidence: 99%

Homogeneous Crystallization of Micro-DispensedTIPS-Pentacene Using a Two-Solvent System toEnable Printed Inverters on Foil Substrates

et al. 2015

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Abstract:We report on a micro-dispensing system for 6,13-Bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) to enable homogenous crystallization and uniform film morphology of the dispensed droplets using a two-solvent mixture along with the use of an insulating binder. This solution composition results in a controlled evaporation of the droplet in ambient air such that the Marangoni flow counteracts the outward convective flow to enable uniform radial crystal growth from the edge towards the center of the drops. The consequence of this process is the high degree of uniformity in the crystallization of the drops, which results in a reduction in the performance spread of the organic field effect transistors (OFET) created using this process. The addition of the insulating binder further improves the reduction in the spread of the results as a trade-off to the reduction in mobility of the transistors. The transfer curves of the OFETs show a tight grouping due to the controlled self-alignment of the TIPS-pentacene crystals; this repeatability was further highlighted by fabricating p-type inverters with driver to load ratios of 8:1, wherein the output inverter curves were also grouped tightly while exhibiting a gain of greater than 4 in the switching region. Therefore, the reliability and repeatability of this process justifies its use to enable large area solution-processed printed circuits at the cost of reduced mobility. OPEN ACCESSElectronics 2015, 4 566

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All‐additive ink‐jet‐printed display backplanes: Materials development and integration

Cited by 48 publications

References 23 publications

Organic Thin Film Transistor Integration

Organic Thin Film Transistor Integration

Fabrication of All-printed Organic TFT Array on Flexible Substrate

Homogeneous Crystallization of Micro-DispensedTIPS-Pentacene Using a Two-Solvent System toEnable Printed Inverters on Foil Substrates

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