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Highly Stretchable, High‐Mobility, Free‐Standing All‐Organic Transistors Modulated by Solid‐State Elastomer Electrolytes
摘要： Highly stretchable, high-mobility, and free-standing coplanar-type all-organic transistors based on deformable solid-state elastomer electrolytes are demonstrated using ionic thermoplastic polyurethane (i-TPU), thereby showing high reliability under mechanical stimuli as well as low-voltage operation. Unlike conventional ionic dielectrics, the i-TPU electrolyte prepared herein has remarkable characteristics, i.e., a large specific capacitance of 5.5 μF cm?2, despite the low weight ratio (20 wt%) of the ionic liquid, high transparency, and even stretchability. These i-TPU-based organic transistors exhibit a mobility as high as 7.9 cm2 V?1 s?1, high bendability (Rc, radius of curvature: 7.2 mm), and good stretchability (60% tensile strain). Moreover, they are suitable for low-voltage operation (VDS = ?1.0 V, VGS = ?2.5 V). In addition, the electrical characteristics such as mobility, on-current, and threshold voltage are maintained even in the concave and convex bending state (bending tensile strain of ≈3.4%), respectively. Finally, free-standing, fully stretchable, and semi-transparent coplanar-type all-organic transistors can be fabricated by introducing a poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid layer as source/drain and gate electrodes, thus achieving low-voltage operation (VDS = ?1.5 V, VGS = ?2.5 V) and an even higher mobility of up to 17.8 cm2 V?1 s?1. Moreover, these devices withstand stretching up to 80% tensile strain.
关键词： free-standing all-organic transistors,stretchable and conformal electronics,high-mobility,elastomer electrolyte,low-voltage operation
更新于2025-11-14 17:28:48
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Flexible all-organic photorefractive devices
摘要： The objective of the present study is to demonstrate and evaluate the photorefractive (PR) performance of an all-organic PR device with a self-assembled monolayer (SAM)-modified organic conductive electrode of PEDOT:PSS coated on polyethylene terephthalate (PET). The PR composite consisted of a triphenylamine-based photoconductive polymer: poly(4-(diphenylamino)benzylacrylate) (PDAA), triphenylamine photoconductive plasticizer: (4-(diphenylamino)phenyl)methanol (TPAOH), nonlinear optical dye based on aminocyanostyrene: (4-asacycloheptylbenzylidenemalononitrile) (7-DCST), and soluble fullerene: [6, 6]-phenyl C61 butyric acid-methyl ester (PCBM). For comparison with the all-organic PR device, the PR performances using PET/ITO, glass/ITO, and glass/PEDOT:PSS substrates were also evaluated. The PR performance at an applied electric field of 40 V μm-1: diffraction efficiency and the response time of the PR device using PET/PEDOT:PSS-SAM substrate were 21.9%, and 390 ms, respectively. As a result of repeating bending test on this all-organic PR device, we found that the flexible PR device with PET/PEDOT:PSS-SAM substrate had a potential to withstand bending 10,000 times and revealed that the change in the haze value strongly influenced the degradation of PR performance.
关键词： All-organic,Photorefractive polymer,ITO-free device,PET substrate,PEDOT:PSS,Flexible
更新于2025-09-23 15:23:52
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Bright Deep Blue TADF OLEDs: The Role of Triphenylphosphine Oxide in NPB/TPBi:PPh <sub/>3</sub> O Exciplex Emission
摘要： Very bright (≈14 000 cd m?2) deep blue exciplex organic light emitting diodes (OLEDs) peaking at ≈435 nm, where the photopic response is ≈0.033, and with CIE color coordinates (0.1525, 0.0820), are described. The OLED properties are interestingly linked to PPh3O (triphenylphosphine oxide) and attributes of the emitting layer (EML) comprising NPB interfacing host:guest TPBi:PPh3O 5:1 weight ratio. A neat PPh3O layer that is central for device performance follows the EML (NPB/TPBi:PPh3O 5:1/PPh3O). The bright electroluminescence originates from NPB/TPBi:PPh3O exciplexes involving triplets via thermally activated delayed fluorescence, as evident from the strong quenching of the photoluminescence (PL) by oxygen and interestingly, the monomolecular emission process. The transient PL decay times of a NPB/TPBi:PPh3O 5:1/PPh3O film are 43 ns in air versus 136, 610, and weak ≈2000 ns in N2. For comparison, the respective PL decay times of films of NPB:TPBi are 16 ns in air versus 131 and 600 ns in N2, and of NPB:PPh3O they are 29 ns in air versus 56, 483, and weak ≈2000 ns in N2. It is suspected that slow emitting states are associated with a PPh3O aggregate interacting with NPB.
关键词： all-organic OLEDs,exciplex TADF OLEDs,bright deep blue OLEDs
更新于2025-09-12 10:27:22
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Self-assembled naphthalimide nanoparticles for non-volatile ReRAM devices: an efficient approach towards high performance solution-processed and all-organic two terminal resistive memory devices
摘要： For almost a decade, organic non-volatile memory incorporating an inorganic metal/ semiconductor nanoparticles in organic polymers are well established in fabricating the resistive switching memory devices. In contrast, for the first time, with an aim to develop all-organic and environment-friendly memory devices, organic small molecule based nanoparticles have been utilized herein to fabricate 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 nanoparticle has been embedded into the polyvinyl alcohol (PVA) 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 Ion/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 (SCLC). 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 a powerful technique to develop all-organic non-volatile memory device and could offer a premise for the future development of high performance low-cost electronic memory devices.
关键词： organic nanoparticle,polymer memory device,all-organic memory device,resistive random access memory,nanocomposites
更新于2025-09-11 14:15:04