Switching Device Based on a Thin Film of an Azo-Containing Polymer for Application in Memory Cells

Attianese, D.; Petrosino, Mario; Vacca, Paolo; Concilio, Simona; Iannelli, Pio; Rubino, Alfredo; Bellone, Salvatore

doi:10.1109/led.2007.910792

Cited by 35 publications

(28 citation statements)

References 20 publications

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“…Although this field is still controversial, researchers have proposed several well-established switching mechanisms based on theoretical simulations, experimental results and advanced analytical techniques. [33][34][35][36][37][38][39][40][41] In this review, we summarize the mechanisms that are used most widely in HPP resistive Scheme 3 Chemical structures of triphenylamine-based polyamides.…”

Section: Mechanismmentioning

confidence: 99%

Solution-processable triarylamine-based high-performance polymers for resistive switching memory devices

Yen

Liou

2015

Polym J

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This review summarizes the most widely used mechanisms in high-performance polymeric resistive memory devices, such as charge transfer, space charge trapping and filament conduction. In addition, recent studies of functional high-performance polymers for memory device applications are reviewed, compared and differentiated based on the mechanisms and structural design methods used. By carefully designing the polymeric structure based on these systematically investigated switching mechanisms, almost all types of current memory characteristics can be reproduced, and these memory properties show extremely high endurance during long-term operation, which makes polyimides very suitable materials for memory applications. INTRODUCTION High-performance polymersToday, life without polymers is unimaginable. Polymers have become the major synthetic materials of the 21st century. High-performance polymers (HPPs) are particularly desirable. The synthesis and development of HPPs over the past 30 years have drawn the attention of many polymer scientists and investigators. These polymers generally possess excellent physical deformation resistance and chemical deterioration resistance at high temperatures over long periods of time. The quest for HPPs began in the late 1950s to meet the demands of the military, aerospace, machine-building and electronics industries, among many other industrial applications.Hill and Walker 1 first noted that the incorporation of aromatic segments into a polymer generally results in a notable increase in its thermal stability. For this reason, much of the research work has been directed toward aromatic compositions. Hence, HPPs usually tend to contain large numbers of aromatic units in their structures. Several of these aromatic HPPs have been used for commercial applications, such as aromatic polyamides, polyimides, polyesters, polysulfones, polytriphenylamine and heterocyclic polymers (Scheme 1). Aromatic polyamides (aramids) and polyimides, such as DuPont's Kevlar fiber and Kapton film, respectively, have been well known for a long time and constantly attract more interest than other HPPs for their useful properties, such as excellent thermal and oxidative stabilities, high mechanical strengths, low flammabilities and good chemical and radiation resistances. [2][3][4][5][6][7][8][9][10][11][12][13] However, the rigidity of the backbone and strong hydrogen bonding of these HPPs result in high melting or glass-transition

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Section: Mechanismmentioning

confidence: 99%

Solution-processable triarylamine-based high-performance polymers for resistive switching memory devices

Yen

Liou

2015

Polym J

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“…For example, E th ASE = 200-390 µJ cm −2 for 5, 10, 90, and 95 wt% F8BT blends pumped at 337 nm with 3 ns, 10 Hz, N 2 laser pulses but there is no ASE for 25, 50, and 75 wt% blends even when pumped at up to 15 mJ cm −2 . [22] This is despite efficient FRET being evident for all photoluminescence (PL) spectra ( Figure S1, Supporting Information). A similar situation arises for other blue (fluorenebased) hosts, including arylaminecon taining holeinjection copolymers.…”

Section: Introductionmentioning

confidence: 98%

Host Exciton Confinement for Enhanced Förster‐Transfer‐Blend Gain Media Yielding Highly Efficient Yellow‐Green Lasers

Zhang

Liu

Wei

et al. 2018

Adv Funct Materials

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This paper reports state-of-the-art fluorene-based yellow-green conjugated polymer blend gain media using Förster resonant-energy-transfer from novel blue-emitting hosts to yield low threshold (≤7 kW cm −2 ) lasers operating between 540 and 590 nm. For poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) (15 wt%) blended with the newly synthesized 3,6-bis(2,7-di([1,1′-biphenyl]-4-yl)-9-phenyl-9H-fluoren-9-yl)-9-octyl-9H-carbazole (DBPhFCz) a highly desirable more than four times increase (relative to F8BT) in net optical gain to 90 cm −1 and 34 times reduction in amplified spontaneous emission threshold to 3 µJ cm −2 is achieved. Detailed transient absorption studies confirm effective exciton confinement with consequent diffusionlimited polaron-pair generation for DBPhFCz. This delays formation of host photoinduced absorption long enough to enable build-up of the spectrally overlapped, guest optical gain, and resolves a longstanding issue for conjugated polymer photonics. The comprehensive study further establishes that limiting host conjugation length is a key factor therein, with 9,9-dialkylfluorene trimers also suitable hosts for F8BT but not pentamers, heptamers, or polymers. It is additionally demonstrated that the host highest occupied and lowest unoccupied molecular orbitals can be tuned independently from the guest gain properties. This provides the tantalizing prospect of enhanced electron and hole injection and transport without endangering efficient optical gain; a scenario of great interest for electrically pumped amplifiers and lasers.

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“…Additionally, many device applications demonstrated to date in covalent systems that benefit from photoresponsive azopolymers, such as photonic components, 67,164 organic lasers 165,166 and conductivity switching, [167][168][169] could benefit from employing the supramolecular materials for optimizing, e.g., the azobenzene content for the described application. Ionic bonding, on the other hand, is generally more stable thermally and temporally, whereas hydrogen-and halogenbonded small molecules are more susceptible to partial loss at higher temperatures or under vacuum drying.…”

Section: Concluding Remarks and Outlookmentioning

confidence: 99%

Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

2018

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a Noncovalent binding of azobenzenes to polymers allows harnessing light-induced molecular-level motions (photoisomerization) for inducing macroscopic effects, including photocontrol over molecular alignment and self-assembly of block copolymer nanostructures, and photoinduced surface patterning of polymeric thin films. In the last 10 years, a growing body of literature has proven the utility of supramolecular materials design for establishing structure-property-function guidelines for photoresponsive azobenzene-based polymeric materials. In general, the bond type and strength, engineered by the choice of the polymer and the azobenzene, influence the photophysical properties and the optical response of the material system. Herein, we review this progress, and critically assess the advantages and disadvantages of the three most commonly used supramolecular design strategies:hydrogen, halogen and ionic bonding. The ease and versatility of the design of these photoresponsive materials makes a compelling case for a paradigm shift from covalently-functionalized side-chain polymers to supramolecular polymer-azobenzene complexes.

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Switching Device Based on a Thin Film of an Azo-Containing Polymer for Application in Memory Cells

Cited by 35 publications

References 20 publications

Solution-processable triarylamine-based high-performance polymers for resistive switching memory devices

Solution-processable triarylamine-based high-performance polymers for resistive switching memory devices

Host Exciton Confinement for Enhanced Förster‐Transfer‐Blend Gain Media Yielding Highly Efficient Yellow‐Green Lasers

Supramolecular design principles for efficient photoresponsive polymer–azobenzene complexes

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