Realizing the Conversion of Resistive Switching Behavior from Binary to Ternary by Adjusting the Charge Traps in the Polymers

Zhang, Hongyan; Zhou, Yijia; Wang, Cheng; Wang, Shuhong

doi:10.1021/acsaelm.1c00382

Cited by 9 publications

(9 citation statements)

References 47 publications

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“…In this region, the current is approximately proportional to the square of the voltage ( I ∝ V 1.88 ), which corresponds to Child's law, known as the space charge limited current (SCLC) region. [ 46–48 ] With the continuous increase of the voltage, some conductive species appeared in the PCz‐BB:CdS layer, and accumulate from ITO to Al to form conductive filament. The conductive species may be generated by the vacancies formed by the escape of S 2– in CdS, and the mechanism diagram is shown in Figure 9b–f.…”

Section: Resultsmentioning

confidence: 99%

“…Once the voltage reaches V th2 and the conductive filament is successfully connected from the bottom electrode to the top electrode, the memory device switches to ON2 state, obeying Ohm's rule ( I ∝ V 1.15 ). [ 46–48 ] The device remains in ON2 state and the carriers are transported along the conductive path and the conductive filament. However, when a reverse voltage is applied, a large amount of Joule heat is generated to break the conductive filament, and the device switches from NO2 state to OFF state.…”

Section: Resultsmentioning

confidence: 99%

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Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Dou

Zhao

Gao

et al. 2022

Macro Chemistry & Physics

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Multi-level memory can greatly improve information density, so it has been widely studied. In this study, a carbazole-based donor-acceptor polymer poly[2,7-9-(heptadecan-9-yl)-9H-carbazole-alt-7H-benzimidazo[2,1a]benz[de]isoquinolin-7-one] (PCz-BB) is synthesized, which exhibits flash-type ternary memory behavior. Further, CdS nanoparticles (NPs) are embedded into the prepared polymer to enhance the storage performance. The current-voltage (I-V) characteristics of memory devices based on PCz-BB:CdS composites and the effect of the embedding ratio of CdS NPs on the memory devices are studied. It is verified that the ON2/ON1/OFF current ratios of the devices at low CdS embedding concentrations are improved, and the threshold voltages are also reduced. The memory device based on the optimal embedding concentration (3 wt% CdS) exhibits a high ON2/ON1/OFF current ratio of 18631:72:1, a low threshold voltage of −0.40/−1.20 V, and excellent stability. The mechanism of resistive switching is explained by the theory of charge traps and conductive filaments. This work provides a new avenue for high-performance multi-level organic electrical storage materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Dou

Zhao

Gao

et al. 2022

Macro Chemistry & Physics

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“…The spin coating speed was 20 s with 750 rpm and 30 s with 2900 rpm. Next, they were put in an oven (60 °C, 12 h) to dry them into films . The Al electrodes were plated on the surface of the active layer via vacuum vapor.…”

Section: Methodsmentioning

confidence: 99%

“…Next, they were put in an oven (60 °C, 12 h) to dry them into films. 21 The Al electrodes were plated on the surface of the active layer via vacuum vapor. Finally, the ITO/PIIO/Al and ITO/PIIO:WS 2 /Al devices were obtained.…”

Section: ■ Introductionmentioning

confidence: 99%

Ternary Flash Memory with a Carbazole-Based Conjugated Copolymer: WS₂ Composites as Active Layers

et al. 2022

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For nonvolatile memory devices, the design and synthesis of their substrate materials are very important. Due to the versatility and large-area fabrication of the low-temperature spin coating process, organic/inorganic nanomaterials as active layers of memory devices have been deeply studied. Inorganic nanoparticles can engage in interactions with polymers via external voltage. WS 2 NPs have a large specific surface area and good conductivity. They can be used as the charge trap center in the active layer, which is conducive to the charge transfer in the active layer. Poly[2,7-9-(9-heptadecanyl)-9Hcarbazole-co-benzo [4,5] imidazole[2,1-α] isoindol-11-one] (PIIO) was synthesized via the Suzuki coupling reaction. ITO/PIIO/Al and ITO/PIIO:WS 2 NP/ Al devices were prepared by the spin coating method and vacuum evaporation technology. All devices showed tristable switching behavior. The influence of the WS 2 mass fraction on memory performance was studied. The device composite with 6 wt % WS 2 NPs showed the best storage features. The OFF/ON1/ON2 current ratio was 1: 1.11 × 10 1 : 2.03 × 10 4 , and the threshold voltage V th1 /V th2 was −0.60 V/−1.05 V. The device is steady for 12,000 s in three states−high-resistance state (HRS), intermediate state (IRS), and low-resistance state (LRS). After reading 3500 times, the switch-state current displayed no obvious attenuation. This work shows that the polymer and its composites have broad prospects in next-generation nonvolatile storage.

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“…[14][15][16] Polymer memory materials can store data through the conversion between the low and high current states between two electrodes by the applied voltage, which can be assigned as "0" and "1" or "OFF" state and "ON" state. [17][18][19][20][21] In recent years, functional polyimides (PIs) are regarded as the most promising polymeric memory materials due to their excellent thermal resistance [22] , chemical stability [23] , mechanical durability [24] and flexibility [25] . More importantly, PIs with the special donor-acceptor (D-A) type molecular structures exhibiting stronger intramolecular and intermolecular charge transfer (CT) effects are more promising for the flexible memory devices.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Polyimides for Resistive Switching Memory Devices Based on Flexible Transparent Polyimide--AgNWs Hybrid Electrodes

Guo-shu

Zhang

She

et al. 2022

Preprint

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With the quick development of flexible memory electronics, multifunctional organic materials have been the necessary for fabricate electronics. In this work, the highly transparent and flexible electrode was successfully prepared by coating the high-performance silver nanowires (AgNWs) onto the colorless polyimide (PI) substrate. The prepared flexible PI-AgNWs electrodes exhibited a low sheet resistance of 15 Ω/sq with the high transparency of 68 % at the wavelength of 400 nm. A novel kind of polyimide TPC6FPI was successfully synthesized and characterized with excellent thermal stabilities and high glass transition temperature (T) above 250 °C. Furthermore, a kind of flexible transparent PI-AgNWs/ TPC6FPI/Al resistive memory device was prepared and exhibited excellent SRAM switching behavior with the threshold voltage of around 2.1V and the ON/OFF current ratio of ~10, which indicated that multifunctional PI-based memory device showed the potential to the wearable devices.

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Realizing the Conversion of Resistive Switching Behavior from Binary to Ternary by Adjusting the Charge Traps in the Polymers

Cited by 9 publications

References 47 publications

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Ternary Flash Memory with a Carbazole-Based Conjugated Copolymer: WS₂ Composites as Active Layers

Multifunctional Polyimides for Resistive Switching Memory Devices Based on Flexible Transparent Polyimide--AgNWs Hybrid Electrodes

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Realizing the Conversion of Resistive Switching Behavior from Binary to Ternary by Adjusting the Charge Traps in the Polymers

Cited by 9 publications

References 47 publications

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Ternary Memory Behavior of Carbazole‐Based Donor–Acceptor Polymer and CdS NPs Composites

Ternary Flash Memory with a Carbazole-Based Conjugated Copolymer: WS2 Composites as Active Layers

Multifunctional Polyimides for Resistive Switching Memory Devices Based on Flexible Transparent Polyimide--AgNWs Hybrid Electrodes

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Resources

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Ternary Flash Memory with a Carbazole-Based Conjugated Copolymer: WS₂ Composites as Active Layers