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- 2018
- Flexible display
- fabrication process
- electrowetting
- PEN substrate
- Optoelectronic Information Science and Engineering
- South China Normal University
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Interactive Colora??Changing Electronic Skin Based on Flexible and Piezoelectrically Tunable Quantum Dots Lighta??Emitting Diodes
摘要： Inspired by animals in nature, such as chameleons, frogs, and cephalopods, the remarkable capability of changing one’s skin color has drawn considerable interests due to its wide applications in camouflage, warning methods, and visual communications. Today, research on electronic skins (e-skins), imitating biological skin by quantifying external stimuli, to mimic this unique color-changing function has been achieved based on the integration of a matrix of displays and sensors; however, integrated systems possess bulky and complicated fabrication processes. Here, the first attempt to demonstrate a single user-interactive e-skin device with color-changing response upon applied external strain is made, while using a cost-effective and space-saving method, which promises to open new possibilities for the development of next-generation e-skins with visual response.
关键词： user-interactive devices,flexible light emitting diodes,electronic skin
更新于2025-09-23 15:19:57
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Hexahedral LED Arrays with Row and Column Control Lines Formed by Selective Liquid-Phase Plasticization and Nondisruptive Tucking-Based Origami
摘要： Origami/kirigami of flexible electronics is a promising way to produce 3D electronics because well-developed silicon-based technologies can be used for the planar circuitry layout. However, it is still a challenge to enable general row and column control lines to develop 3D addressable sensory and display systems. This study addresses this issue via selective plasticization of an acrylonitrile butadiene styrene (ABS) film with N,N-dimethylformamide (DMF) through polydimethylsiloxane (PDMS) microfluidic channels. The use of DMF provides plasticization in a controllable manner because of the fast absorption of the DMF in the liquid phase during the plasticization process, a prolonged retention time of DMF in the ABS film at room temperature during the transformation process, and fast desorption at 60–80 °C for the deplasticization process. The use of microfluidic channels allows high-resolution selective plasticization to enable extreme cases of local bending or even folding inward and outward, thereby enabling tucking-based origami with no crack generation. The lamination of membrane-type electronic devices to an ABS film followed by selective plasticization and transformation enables nondisruptive tucking-based origami at the electronics level, such as for the demonstration of a hexahedral light-emitting diode (LED) array with general row and column control lines.
关键词： tucking-based origami,plasticization,microchannel,3D electronics,flexible electronics
更新于2025-09-23 15:19:57
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Recent development of soluble hole injection material for OLED display
摘要： We developed soluble hole injection materials and inks, named ELsource, that can be used as hole injection layer in organic light-emitting diode (OLED) display. OLED is an optical device. Therefore, we developed the hole injection materials with optical properties necessary for an optical device.
关键词： refractive index,optical property,printable OLED,flexible,HIL,hole injection layer,soluble,hole injection material,adhesion,HIM
更新于2025-09-23 15:19:57
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Organic and quantum-dot hybrid white LEDs using a narrow bandwidth blue TADF emitter
摘要： White electroluminescence is of particular importance for high resolution full-color flexible displays which employ the down-conversion scheme to generate the individual red, green and blue emissions from the color filters. Quantum dots (QD) light emitting diodes possess ultrahigh brightness and considerably narrow full-width-half-maximum (FWHM) spectra. Nevertheless, inefficient blue QDs limit the overall device performances. Herein, we introduced a boron-based blue thermally activated delayed fluorescence compound and utilized the host-guest system to construct the solution-process white devices. Red and green QDs combined with the blue emitter make it feasible to design the flexible white devices with the sharp peaks and thus intrinsically wide color gamuts. The proof-of-concept hybrid white devices with a single emissive layer exhibited the external quantum efficiencies of 6.9% (on rigid substrate) and 2.3% (on flexible substrate). The color mixing effect and energy transfer among the lumophores were exemplified with three sharp peaks at around 464, 538 and 622 nm, respectively accompanied with the corresponding FWHM of 30, 34 and 31 nm of each component.
关键词： Thermally activated delayed fluorescence,Color gamuts,White electroluminescence,Flexible displays,Quantum dots
更新于2025-09-23 15:19:57
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Flexible and Selfa??Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI <sub/>3</sub> a??CsPbBr <sub/>3</sub> Heterojunction Nanowire Array
摘要： Self-powered perovskite photodetectors mainly adopt the vertical heterojunction structure composed of active layer, electron–hole transfer layers, and electrodes, which results in the loss of incident light and interfacial accumulation of defects. To address these issues, a self-powered lateral photodetector based on CsPbI3–CsPbBr3 heterojunction nanowire arrays is designed on both a rigid glass and a flexible polyethylene naphthalate substrate using an in situ conversion and mask-assisted electrode fabrication method. Through adding the polyvinyl pyrrolidone and optimizing the concentration of precursors under the pressure-assisted moulding process, both the crystallinity and stability of perovskite nanowire array are improved. The nanowire array–based lateral device shows a high responsivity of 125 mA W?1 and a fast rise and decay time of 0.7 and 0.8 ms under a self-powered operation condition. This work provides a new strategy to fabricate perovskite heterojunction nanoarrays towards self-powered photodetection.
关键词： perovskites,photodetectors,flexible devices,self-powered
更新于2025-09-23 15:19:57
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Fermi velocity renormalization in graphene probed by terahertz time-domain spectroscopy
摘要： We demonstrate terahertz time-domain spectroscopy (THz-TDS) to be an accurate, rapid and scalable method to probe the interaction-induced Fermi velocity renormalization νF* of charge carriers in graphene. This allows the quantitative extraction of all electrical parameters (DC conductivity σDC, carrier density n, and carrier mobility μ) of large-scale graphene films placed on arbitrary substrates via THz-TDS. Particularly relevant are substrates with low relative permittivity (< 5) such as polymeric films, where notable renormalization effects are observed even at relatively large carrier densities (> 1012 cm-2, Fermi level > 0.1 eV). From an application point of view, the ability to rapidly and non-destructively quantify and map the electrical (σDC, n, μ) and electronic (νF*) properties of large-scale graphene on generic substrates is key to utilize this material in applications such as metrology, flexible electronics as well as to monitor graphene transfers using polymers as handling layers.
关键词： Graphene,THz-TDS,Fermi Velocity Renormalization,Mobility Mapping,Flexible Substrates
更新于2025-09-23 15:19:57
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Comparative study of optimised molybdenum back-contact deposition with different barriers (Ti, ZnO) on stainless steel substrate for flexible solar cell application
摘要： In this study, we optimised the molybdenum (Mo) back-contact layer for solar cell applications on stainless steel substrates using direct-current (dc) sputtering with varying sputtering powers (100 W to 500 W) and pressures (5 mTorr to 20 mTorr). We comparatively analysed the effectiveness of titanium (Ti) layer deposited using e-beam evaporation deposition and zinc oxide (ZnO) layer deposited using radio-frequency (RF) sputtering for barrier application with Mo. Structural characterisation of the optimised Mo films was carried out using XRD studies confirmed the (110) plane corresponding to the body-centred cubic (bcc) structure. Estimated Mo film parameters for films deposited on barrier layers were compared against films deposited on SS substrate without any barriers as these properties influence the prospective diffusion of Fe and Cr into the absorber layer. Surface characterisation of the deposited films was carried out using a scanning electron microscopy (SEM) to study the morphology of films, and energy-dispersive X-ray (EDX) to identify elemental presence to confirm the blockage of the impurities atoms through the film. Secondary ion mass spectroscopy (SIMS) was employed to study the depth profiles of films while atomic force microscopy (AFM) was used to characterise the topographical properties from the sputtered Mo film and analyse the grain properties of the films. A low resistivity value of 0.511 × 10–6 Ω m for Mo films on the reference glass substrate and 0.625 × 10–6 Ω m for the Mo film on ZnO barrier was measured using the four-point probe. We observed a further 40% reduction in impurities using annealed ZnO barrier combined with an optimised Mo layer.
关键词： flexible solar cell,stainless steel substrate,sputtering,barrier layers,molybdenum back-contact
更新于2025-09-23 15:19:57
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Over 14% Efficiency Folding-Flexible ITO-free Organic Solar Cells Enabled by Eco-friendly Acid-Processed Electrodes
摘要： Environment-friendly manufacturing and mechanical robustness are imperative for commercialization of flexible OSCs as green-energy source, especially in portable and wearable self-powered flexible electronics. Although, the commonly adopted PEDOT:PSS electrodes that are treated with severely corrosive and harmful acid lack foldability. Herein, efficient folding-flexible OSCs with highly conductive and foldable PEDOT:PSS electrodes processed with eco-friendly cost-effective acid and polyhydroxy compound are demonstrated. The acid treatment endows PEDOT:PSS electrodes with high conductivity. Meanwhile, polyhydroxy compound doping contributes to excellent bending flexibility and foldability due to the better film adhesion between PEDOT:PSS and PET substrate. Accordingly, folding-flexible OSCs with high efficiency of 14.17% were achieved. After 1,000 bending or folding cycles, the device retained over 90% or 80% of its initial efficiency, respectively. These results represent one of the best performances for ITO-free flexible OSC reported so far and demonstrate a novel approach toward commercialized efficient and foldable green-processed OSCs.
关键词： high efficiency,flexible organic solar cells,foldability,PEDOT:PSS,eco-friendly acid
更新于2025-09-23 15:19:57
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Selfa??Powered Flexible TiO <sub/>2</sub> Fibrous Photodetectors: Heterojunction with P3HT and Boosted Responsivity and Selectivity by Au Nanoparticles
摘要： A novel inorganic–organic heterojunction (TiO2/P3HT (poly(3-hexylthiophene)) is easily prepared by a combination of anodization and vacuumed dip-coating methods, and the constructed flexible fibrous photodetector (FPD) exhibits high-performance self-powered UV–visible broadband photoresponse with fast speed, high responsivity, and good stability, as well as highly stable performance at bending states, showing great potential for wearable electronic devices. Moreover, Au nanoparticles are deposited to further boost the responsivity and selectivity by regulating the sputtering intervals. The optimal Au/TiO2/P3HT FPD yields an ≈700% responsivity enhancement at 0 V under 350 nm illumination. The sharp cut-off edge and high UV–visible rejection ratio (≈17 times higher) indicate a self-powered flexible UV photodetector. This work provides an effective and versatile route to modulate the photoelectric performance of flexible electronic devices.
关键词： TiO2/P3HT heterojunctions,Au nanoparticles,fiber photodetectors,flexible devices,self-powered
更新于2025-09-23 15:19:57
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Laser-Induced Graphene Paper Heaters with Multimodally Patternable Electrothermal Performance for Low-Energy Manufacturing of Composites
摘要： Low-energy manufacturing of polymeric composites through two-dimensional electrothermal heaters is a promising strategy over traditional autoclave and oven. Laser induced graphene paper (LIGP) is a recent emergent multifunctional material with merits of one-step computer aided design and manufacturing (CAD/CAM) as well as flexible thin nature. To fully explore its capabilities of in situ heating, herein, we adventurously propose and investigate the customizable manufacture and modulation of LIGP enabled heaters with multimodally patternable performance. Developed by two modes (uniform & nonuniform) of laser processing, the LIGP heaters (LIGP-H) show distinctively unique characteristics, including high working range (> 600 °C), fast stabilization (< 8 s), high temperature efficiency (~370 °C·cm2/W), and superb robustness. Most innovatively, the non-uniform processing could section LIGP-H into subzones with independently controlled heating performance, rendering various designable patterns. The above unique characteristics guarantee the LIGP-H highly reliable for in situ curing composites with flat, curve and even inhomogeneous structures. With enormous energy-saving (~85%), superb curing accuracy, and comparable mechanical strength, the proposed device is advantageous for assuring high-quality and high-efficient manufacturing.
关键词： polymeric composites,graphene papers,thin film heaters,flexible electronics,laser-induced graphene
更新于2025-09-23 15:19:57