Nanoscale Film Morphology and n‐Type Digital Memory Characteristics of π‐Conjugated Donor–Acceptor Alternating Copolymer Based on Thiophene and Thiadiazole Units

Lee, Hoyeol; Fukuta, Seijiro; Kim, Hwajeong; Kim, Youngkyoo; Higashihara, Tomoya; Ree, Moonhor

doi:10.1002/marc.201900005

Cited by 4 publications

(4 citation statements)

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“…The I-V data at the OFF-state could be successfully fitted with a combination of Ohmic conduction model [24][25][26][27][28] (for the low voltage region) and trap-limited space charge limited conduction (SCLC) model [29][30][31][32][33][34] (for the relatively high voltage region) (Figure 5b). The I-V data at the ON-state could be fitted well with only Ohmic conduction model [24][25][26][27][28][29] (Figure 5c). Similar fit results are observed for the I-V data of PEM-ES and PVP at the OFF-and ONstates (Figures S11b,c dielectric characteristics rather than electrical memory behaviors.…”

Section: Resultsmentioning

confidence: 99%

“…Second, the current−voltage ( I – V ) data of PEM‐EP device in the OFF‐ and ON‐state have been analyzed by using various models in order to find clues on digital memory mechanism. The I – V data at the OFF‐state could be successfully fitted with a combination of Ohmic conduction model [ 24–28 ] (for the low voltage region) and trap‐limited space charge limited conduction (SCLC) model [ 29–34 ] (for the relatively high voltage region) (Figure 5b). The I – V data at the ON‐state could be fitted well with only Ohmic conduction model [ 24–29 ] (Figure 5c).…”

Section: Resultsmentioning

confidence: 99%

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Newly Found Digital Memory Characteristics of Pyrrolidone‐ and Succinimide‐Based Polymers

Ryu

Jin³

et al. 2021

Macromol. Rapid Commun.

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This study reports for the first time the excellent nonvolatile and volatile digital memory characteristics of polymers bearing 2-pyrrolidone and succinimide moieties. A series of new polymers is synthesized from poly(ethylene-alt-maleic anhydride) and four alcohol derivatives with and without 2-pyrrolidone and succinimide moieties. All polymers, including polyvinylpyrrolidone, are found to be thermally stable up to 195°C or higher, and characterized regarding their molecular orbital energy levels, bandgap, and resistive digital memory behaviors. Excitingly, the polymers bearing either 2-pyrrolidone or succinimide moiety demonstrate p-type digital memory behaviors with high ON/OFF current ratios and long reliabilities. Nonvolatile digital memory performance is achieved over the film thickness range of 10-80 nm, whereas volatile digital memory is demonstrated over a much narrower range of film thickness. All digital memory performances can be originated from the 2-pyrrolidone and succinimide moieties possessing high affinity and stabilization power to charges via charge traps and transformations based on a hopping conduction process. Hence, these new polymers are suitable for the production of high-performance p-type nonvolatile and volatile digital memory devices. Moreover, 2-pyrrolidone and succinimide can be used as new and economical electroactive building blocks for the development of advanced digital memory materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Newly Found Digital Memory Characteristics of Pyrrolidone‐ and Succinimide‐Based Polymers

Ryu

Jin³

et al. 2021

Macromol. Rapid Commun.

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“…For future storage devices, many plausible alternatives have been proposed so far: polymer, molecular, ferroelectric, magnetic, and phase change memories. ,,− In particular, polymer memory has gained much attention for its various advantages including easy processability, structural flexibility, miniaturized dimensions, excellent scalability, low-power operation, three-dimensional stacking capability, light weight, wearability, and low-cost potential. ,− According to chemical structures and constitutions, three different classes of electrical memory polymers have been reported: (i) fully π-conjugated polymers, ,− (ii) partially π-conjugated polymers with and without additional electroactive units, ,− , and (iii) fully non-π-conjugated polymers bearing electroactive units. ,− ,− Overall, the majority of electrical memory polymers reported in the literature are limited to π-conjugated hydrocarbons, nitrogen atoms, and their combinations. Therefore, research and development of high performance digital memory polymers are still in the developing stages.…”

Section: Introductionmentioning

confidence: 99%

Chemically Controlled Volatile and Nonvolatile Resistive Memory Characteristics of Novel Oxygen-Based Polymers

Ree

Isono

Satoh

2020

ACS Appl. Mater. Interfaces

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Materials and SynthesisPoly(ethylene-alt-dibenzyl maleate) (PEM-Bz). PEM (200 mg, 1.59 mmol of anhydride moiety) was mixed with benzyl alcohol (0.821 ml, 7.93 mmol) in dry DMF (30 mL). EDC (912.1 mg, 4.76 mmol), DMAP (581.3 mg, 4.76 mmol), and triethylamine (TEA: 0.221 mL, 1.59 mmol) were then added to the mixture (Scheme 1). The mixture was stirred in room temperature for 72 h. The dry DMF was then removed from the reaction flask through evaporation and the remaining contents were dissolved with dichloromethane (CH2Cl2). The reaction mixture in CH2Cl2 was then precipitated into cold methanol (MeOH) to yield white powder. The cold precipitation step was repeated three times to yield the final product (466.4 mg). Yield: 90.7%. 1 H NMR (400 MHz, CDCl3): δ (ppm) 7.22 (br, aromatic), 4.91 (br, -OCH2-benzyl), 2.80-0.95 (m, -CH2-CH2-CH(COO-benzyl)-CH(COObenzyl)-). Mn,SEC = 168.0 kDa (DMF); Ð = 2.85. Poly(ethylene-alt-di(4-methylbenzyl) maleate) (PEM-BzMe). PEM-BzMe was synthesized from PEM (200 mg, 1.59 mmol of anhydride moiety) and 4-methylbenzyl alcohol (7.93 mmol) in the same manner as PEM-Bz was prepared above (Scheme 1). Yield: 67.4%. 1 H NMR (400

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“…Several inorganic transitional metal oxides, such as CoO, HfO 2 , TiO 2 , NiO, SrTiO 3 , and SiO 2 , etc., − have emerged successfully as active layers for an inorganic resistive random-access memory device. Nevertheless, organic materials also swear to compete over the counterpart with a wide range of polymers − and monomers − exhibiting electrical bistability. Moreover, novel organic–inorganic hybrid materials such as perovskites − are also being explored in the field of two-terminal ReRAM devices.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Naphthalimide Nanoparticles for Nonvolatile ReRAM Devices: An Efficient Approach toward High Performance Solution-Processed and All-Organic Two-Terminal Resistive Memory Devices

Arunagirinathan

Meher

Iyer

2019

ACS Appl. Electron. Mater.

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For almost a decade, organic nonvolatile memory incorporating an inorganic metal/semiconductor nanoparticles in organic polymers have been well-established in fabricating the resistive switching memory devices. In contrast, for the first time, with an aim to develop all-organic and environmentally friendly memory devices, organic small molecule based nanoparticles have been utilized herein to fabricate a high performance resistive random-access memory (ReRAM) device by incorporating them into a polymer matrix. A naphthalimide based small molecule with formyl and multiple fluorine moieties has been strategically utilized, which enhances the intermolecular H-bonding and subsequently strengthens the intermolecular π–π stacking interaction during nanoaggregate formation. To generate a stable monodispersed nanoparticle with an average diameter of 50 nm, a straightforward yet cost-effective reprecipitation technique has been used. The prepared nanoparticles have been embedded into the poly(vinyl alcohol) polymer matrix to serve as a reliable alternative of the conventional inorganic nanoparticles. The fabricated memory device exhibits an error free memory window with an I on/I off ratio of 103 and a very low write/erase voltage of ±2 V, which are effectively comparable to the existing inorganic nanoparticle based memory devices. In addition, theoretical models employed to study the charge transport of the device suggested that the conduction in the device is ultimately a trap-controlled space charge limited current. Furthermore, the endurance, repeatability test and concentration studies are also thoroughly performed on the device to validate its stability. This simple yet potential approach of incorporating organic nanoparticles into an organic insulator polymer is an easy, greener, and powerful technique to develop an all-organic nonvolatile memory device and could offer a premise for the future development of high-performance low-cost electronic memory devices.

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Nanoscale Film Morphology and n‐Type Digital Memory Characteristics of π‐Conjugated Donor–Acceptor Alternating Copolymer Based on Thiophene and Thiadiazole Units

Cited by 4 publications

References 24 publications

Newly Found Digital Memory Characteristics of Pyrrolidone‐ and Succinimide‐Based Polymers

Newly Found Digital Memory Characteristics of Pyrrolidone‐ and Succinimide‐Based Polymers

Chemically Controlled Volatile and Nonvolatile Resistive Memory Characteristics of Novel Oxygen-Based Polymers

Self-Assembled Naphthalimide Nanoparticles for Nonvolatile ReRAM Devices: An Efficient Approach toward High Performance Solution-Processed and All-Organic Two-Terminal Resistive Memory Devices

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