Bistable Resistive Memory Switches fabricated by Floating Thin Films of Conjugated Polymers

Sharma, Shubham; Kumari, Nikita; Nagamatsu, Shuichi; Nakamura, Masakazu; Pandey, Shyam S.

doi:10.1016/j.mtelec.2023.100043

Cited by 7 publications

(8 citation statements)

References 47 publications

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“…The combination of out-of-plane and inplane diffraction results shows that the PTB7 is mainly face-on oriented with π−π and alkyl chain stacking horizontal to the substrate surface enabling facile charge carrier transport in the vertical direction. 35,36 During the fabrication of films on a hydrophilic liquid substrate in UFTM, the SCP backbone with hydrophilic side chains tends to form a face-on-dominated conformation. PTB7, incorporating hydrophilic moieties within its alkyl side chains, exhibits a predominant face-on population of polymeric domains utilizing UFTM.…”

Section: Resultsmentioning

confidence: 99%

“…In this section, we thoroughly investigated the charge transport mechanism of our memristors. Previous studies demonstrated that the charge transport across the nanoclusters forms distinct positive–negative electronic regions. , To explain this phenomenon in the proposed memristor under investigation, we assume that the Al/PTB7/Al-AlO x nanocluster/PTB7/Al configuration is a 1-D structure. Considering SCP molecules and nanoparticles as p and n , respectively, and the total number of particles as T in the device configuration, we aim to understand the interaction between two SCP molecules and the interaction between an SCP molecule and a nanoparticle.…”

Section: Resultsmentioning

confidence: 99%

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High-Density, Nonvolatile, Flexible Multilevel Organic Memristor Using Multilayered Polymer Semiconductors

Sharma,

Pandey,

Nagamatsu

et al. 2024

ACS Appl. Mater. Interfaces

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Nonvolatile organic memristors have emerged as promising candidates for next-generation electronics, emphasizing the need for vertical device fabrication to attain a high density. Herein, we present a comprehensive investigation of highperformance organic memristors, fabricated in crossbar architecture with PTB7/Al-AlO x -nanocluster/PTB7 embedded between Al electrodes. PTB7 films were fabricated using the Unidirectional Floating Film Transfer Method, enabling independent uniform film fabrication in the Layer-by-Layer (LbL) configuration without disturbing underlying films. We examined the charge transport mechanism of our memristors using the Hubbard model highlighting the role of Al-AlO x -nanoclusters in switching-on the devices, due to the accumulation of bipolarons in the semiconducting layer. By varying the number of LbL films in the device architecture, the resistance of resistive states was systematically altered, enabling the fabrication of novel multilevel memristors. These multilevel devices exhibited excellent performance metrics, including enhanced memory density, high on−off ratio (>10 8 ), remarkable memory retention (>10 5 s), high endurance (87 on−off cycles), and rapid switching (∼100 ns). Furthermore, flexible memristors were fabricated, demonstrating consistent performance even under bending conditions, with a radius of 2.78 mm for >10 4 bending cycles. This study not only demonstrates the fundamental understanding of charge transport in organic memristors but also introduces novel device architectures with significant implications for high-density flexible applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High-Density, Nonvolatile, Flexible Multilevel Organic Memristor Using Multilayered Polymer Semiconductors

Sharma,

Pandey,

Nagamatsu

et al. 2024

ACS Appl. Mater. Interfaces

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“…Finally, in the PTB-7 UFTM-coated thin film, the out-of-plane XRD results exhibited a clear (010) peak corresponding to π-π stacking, whereas there was an absence of (h00) peaks corresponding to alkyl chains. Further, in the in-plane GIXD measurement for the PTB-7 thin films, (h00) alkyl chain peaks up to the third order were present, and there were no (0k0) π-π stacking peaks ( Figure 4 g,h) [ 35 ]. This shows that the crystallites of PTB-7 are face-on-oriented.…”

Section: Resultsmentioning

confidence: 99%

The Influence of a Microstructural Conformation of Oriented Floating Films of Semiconducting Polymers on Organic Device Performance

Sharma,

Gaurav,

Nagamatsu

et al. 2024

Polymers

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Extended π-conjugation with backbone-planarity-driven π-π stacking dominates charge transport in semiconducting polymers (SCPs). The roles of SCP film morphology and macromolecular conformation concerning the substrate in influencing charge transport and its impact on device performance have been a subject of extensive debate. Face-on SCPs promote out-of-plane charge transport primarily through π-π stacking, with conjugated polymeric chains assisting transport in connecting crystalline domains, whereas edge-on SCPs promote in-plane charge transport primarily through conjugation and π-π stacking. In this work, we fabricated three different types of devices, namely, organic field effect transistors, organic Schottky diodes, and organic bistable memristors, as representatives of planar and vertical devices. We demonstrate that a planar device, i.e., an organic field effect transistor, performs well in an edge-on conformation exhibiting a field-effect mobility of 0.12 cm2V−1s−1 and on/off ratio >104, whereas vertical devices, i.e., organic Schottky diodes and organic memristors, perform well in a face-on conformation, exhibiting exceptionally high on/off ratios of ~107 and 106, respectively.

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“…[34][35][36][37][38][39] Moreover, our group developed thermal-responsive memory devices whose performance could be simply adjusted and controlled from tristable switching behaviour to bistable switching behaviour by temperature. 40 To the best of our knowledge, previous efforts in stimuliresponsive materials focused on traditional memory performance, that is, the memory behaviour with poor security, which significantly limited their application hence posing a bottleneck in the use of traditional memory devices. Therefore, it is highly desirable to prepare novel active materials or/and memory devices that can achieve not only date storage but also secure memory devices.…”

Section: Introductionmentioning

confidence: 99%

“…34–39 Moreover, our group developed thermal-responsive memory devices whose performance could be simply adjusted and controlled from tristable switching behaviour to bistable switching behaviour by temperature. 40…”

Section: Introductionmentioning

confidence: 99%

A metastable small organic molecule for secure memory devices

Wang,

Du,

Zhang

et al. 2024

New J. Chem.

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Bistable Resistive Memory Switches fabricated by Floating Thin Films of Conjugated Polymers

Cited by 7 publications

References 47 publications

High-Density, Nonvolatile, Flexible Multilevel Organic Memristor Using Multilayered Polymer Semiconductors

High-Density, Nonvolatile, Flexible Multilevel Organic Memristor Using Multilayered Polymer Semiconductors

The Influence of a Microstructural Conformation of Oriented Floating Films of Semiconducting Polymers on Organic Device Performance

A metastable small organic molecule for secure memory devices

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