Non-volatile organic ferroelectric memory transistors fabricated using rigid polyimide islands on an elastomer substrate

Jung, Soon‐Won; Koo, Jae Bon; Park, Chan Woo; Na, Bock Soon; Park, Nae-Man; Oh, Jiyoung; Moon, Yu Gyeong; Lee, Sang Seok; Koo, Kyung-Wan

doi:10.1039/c6tc00083e

Cited by 28 publications

(23 citation statements)

References 40 publications

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“…The modulus of PDMS can be regulated by the mass ratio of base monomer to curing agent, which is not suitable to making a single piece of PDMS film with domains of different modulus. Till now, the main strategy to realize different mechanical domains in a single film is embedding rigid materials, e.g., polyimide, polyethylene terephthalate, and photoresist, into the elastomers . However, the photolithography fabrication process is complicated, and the interface between different materials is hard to control in the current method.…”

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confidence: 99%

Mechanocombinatorially Screening Sensitivity of Stretchable Strain Sensors

et al. 2019

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are often realized at the expense of stretchability, and vice versa. Hence, developing strain sensors with customizable sensitivity could be vital for reliable sensing. The sensitivity of resistive-type strain sensors is defined by gauge factor, GF = (ΔR/R 0 )/ε, where ΔR is the resistance change with strain, R 0 is the resistance before strain, and ε is the applied strain. [28] Currently, a large number of stretchable strain sensors are developed based on conductive materials, such as carbon nanotubes, graphene, metal networks, and liquid metal. [1,2,26,[29][30][31][32][33][34] The sensitivity is highly scattered and independent due to different sensing materials and diverse fabrication methods (Table S1, Supporting Information). Thus, it still remains a challenge to screen out the specific sensitivity from these traditional strain sensors.The resistive-type stretchable strain sensors are typically composed of conductive films and polymer substrates. [28,35,36] The mechanism involves the transfer of strain from the substrate to the conductive film during stretching, which induces cracks and thus increases electrical resistance; when the strain is released, the resistance returns to its initial value. [6] Hence, the strain distribution of polymer substrates largely determines the resistance-strain behavior of the conductive film, thereby determining sensitivity. According to mechanics of materials, strain is uniformly distributed over a mechanically homogeneous film ( Figure S1, Supporting Information). In contrast, taking a simplest mechanically heterogeneous film for example, strain is redistributed over the film, and local strain is determined by two factors, mechanics and structure parameters ( Figure S2, Supporting Information). Therefore, for the resistive-type stretchable strain sensors, the sensitivity could be screened via strain distribution of substrates. Based on finite element modeling (FEM), strain is indeed redistributed on mechanically heterogeneous substrates, which are composed of low and high modulus regions (Figure 1a,b). Numerous gradient structures can be precisely obtained by changing the parameter of substrates. By combining both mechanics and structure parameters of the substrates, a strategy we termed mechanocombinatorics, strain redistribution could be systematically studied. The strain enhancement is well customized by mechanically combined parameters, modulus ratio and pitch, which can be directly extracted from the strain enhancement library (Figure 1c). Stretchable strain sensors have aroused great interest for their application inhuman activity recognition, health monitoring, and soft robotics. For various scenarios involving the application of different strain ranges, specific sensitivities need to be developed, due to a trade-off between sensor sensitivity and stretchability. Traditional stretchable strain sensors are developed based on conductive sensing materials and still lack the function of customizable sensitivity. A novel strategy of mechanocombinatorics is proposed to scr...

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Mechanocombinatorially Screening Sensitivity of Stretchable Strain Sensors

et al. 2019

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“…To date, very few publications have been reported on stretchable inorganic memory devices that are based on buckled structures and crosspoint arrays . Even fewer publications about stretchable OMDs have been reported . Chen fabricated a stretchable organic resistive memory with a buckled structure using a mechanically flexible and elastic graphene bottom electrode and stretchable P3BT:poly(methyl methacrylate) (PMMA) polymer semiconductor .…”

Section: Stretchable Organic Memory Devicesmentioning

confidence: 99%

“…Even after 500 stretching cycles from 0% to 30% strain, the stretchable OMD exhibited excellent electrical switching functions and memory effects. Another publication demonstrated non‐volatile organic ferroelectric memory transistors fabricated using rigid PI islands on an elastomer substrate, which exhibit no noticeable change in electrical performance up to 50% strain …”

Section: Stretchable Organic Memory Devicesmentioning

confidence: 99%

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Stretchable Organic Semiconductor Devices

et al. 2016

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Stretchable electronics are essential for the development of intensely packed collapsible and portable electronics, wearable electronics, epidermal and bioimplanted electronics, 3D surface compliable devices, bionics, prosthesis, and robotics. However, most stretchable devices are currently based on inorganic electronics, whose high cost of fabrication and limited processing area make it difficult to produce inexpensive, large-area devices. Therefore, organic stretchable electronics are highly attractive due to many advantages over their inorganic counterparts, such as their light weight, flexibility, low cost and large-area solution-processing, the reproducible semiconductor resources, and the easy tuning of their properties via molecular tailoring. Among them, stretchable organic semiconductor devices have become a hot and fast-growing research field, in which great advances have been made in recent years. These fantastic advances are summarized here, focusing on stretchable organic field-effect transistors, light-emitting devices, solar cells, and memory devices.

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“…As a result, both stretchable and nonstretchable functional devices can be located on the mechanically compatible parts of the hybrid structure, and combined as a complete unit with integrated functions. This method shows potential as a general solution for the construction of wearable electronic modules . Next, inspired by the ability of animals to memorize various gestures by detecting the movements of their body parts and storing the relevant information in their brains (Scheme a), we conceived of an integrated device to achieve a human motion memory system.…”

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Stretchable Motion Memory Devices Based on Mechanical Hybrid Materials

Liu

Zhu

et al. 2017

Advanced Materials

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Animals possess various functional systems such as sensory, nervous, and motor systems, which show effective cooperation in order to realize complicated and intelligent behaviors. This inspires rational designs for the integration of individual electronic devices to exhibit a series of functions, such as sensing, memory, and feedback. Inspired by the fact that humans can monitor and memorize various body motions, a motion memory device is developed to mimic this biological process. In this work, mechanical hybrid substrates are introduced, in which rigid memory devices and stretchable strain sensors are integrated into a single module, which enables them to work cooperatively in the wearable state. When attached to the joints of limbs, the motion memory device can detect the deformations caused by limb motions and simultaneously store the corresponding information in the memory device. This work would be valuable in materials design and electronics technology toward the realization of wearable and multifunctional electronic modules.

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Non-volatile organic ferroelectric memory transistors fabricated using rigid polyimide islands on an elastomer substrate

Abstract: The authors fabricated stretchable organic ferroelectric memory transistors (OFMTs) on a polydimethylsiloxane substrate using rigid polyimide island structures.

Cited by 28 publications

References 40 publications

Mechanocombinatorially Screening Sensitivity of Stretchable Strain Sensors

Mechanocombinatorially Screening Sensitivity of Stretchable Strain Sensors

Stretchable Organic Semiconductor Devices

Stretchable Motion Memory Devices Based on Mechanical Hybrid Materials

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