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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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Laser transmission welding and surface modification of graphene film for flexible supercapacitor applications
摘要： When a graphene ?lm is coated onto a ?exible polymer substrate, weak adhesion can cause delamination of the ?lm under mechanical bending. Moreover, as each graphene layer restacks, the performance of the ?lm as an electrode for a supercapacitor becomes limited. In this study, facile laser welding and surface modi?cation processes are demonstrated to overcome these limitations. First, a continuous wave laser beam is applied to the interface between the coated graphene and the underlying transparent polycarbonate substrate. This welding process signi?cantly improves their adhesion and enables excellent mechanical bendability. Second, surface modi?cation of graphene is achieved under ambient conditions by irradiating the graphene ?lm surface with a nanosecond pulsed laser. Sandwich-type supercapacitors are fabricated using these surface-modi?ed graphene electrodes with a PVA-H3PO4 electrolyte. The e?ect of the laser ?uence on the performance of the supercapacitor is investigated. At an optimal laser power, an areal capacitance of 4.7 mF/cm2 is achieved.
关键词： Laser transmission welding,Graphene,Flexible device,Supercapacitor,Pulsed laser
更新于2025-11-25 10:30:42
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One-step Fabrication of Bio-Compatible Coordination Complex Film on Diverse Substrates for Ternary Flexible Memory
摘要： Recently, resistance random access memories (RRAMs) have been studied extensively arising from the increasing demand for information. However, its flexible device remains challenging because the active materials involved need to be nontoxic, non-polluting, distortion-tolerable, and bio-degradable as well adhesive to diverse flexible substrates. In this paper, we employed tannic acid (TA) and iron ion (Fe (III)) coordination complex as the active layer in sandwich-like (Al/active layer/substrate) device to achieve memory performance. A nontoxic, biocompatible TA-Fe (III) coordination complex was synthesized by one-step self-assembly solution. The memory performance of TA-Fe (III) retention time up to 15000 s, yield up to 53%. Furthermore, the TA-Fe (III) coordination complex can form high-quality film and show stable ternary memory behaviors on various flexible substrates, such as polyethylene terephthalate (PET), polyimide (PI), printer paper and leaf. The device can be degraded by immerse in vinegar solution. Our work will broaden the application of organic coordination complex in flexible memory device with diverse substrates.
关键词： Bio-compatible,RRAM,ternary memory,flexible
更新于2025-11-21 11:18:25
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Highly flexible self-powered photodetectors based on core–shell Sb/CdS nanowires
摘要： Flexible photodetectors have great applications in flexible image sensors, wearable electronics and smart robots. In this work, we reported the fabrication of highly flexible self-powered photodetectors with core-shell Sb/CdS nanowires as the sensing materials. The fabricated device exhibited high Ion/Ioff ratio of 3.54×103 under zero bias, fast speed of photoresponse and great stability. An open-circuit voltage of 0.35 V was generated due to the presence of CdS and CdSb interfaces within the core-shell nanowires. Besides, the photocurrent of the flexible device is nearly invariable at various bending angles and even after thousands of bending cycles, demonstrating the excellent flexibility and bending stability. The results indicated that the self-powered photodetectors are promising candidates for future passive optoelectronic devices.
关键词： core-shell Sb/CdS nanowires,optoelectronic devices,self-powered,flexible photodetectors
更新于2025-11-21 11:03:13
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Flexible and Ultrasensitive Piezoelectric Composites Based on Highly (00l)‐Assembled BaTiO <sub/>3</sub> Microplatelets for Wearable Electronics Application
摘要： Piezoelectric wearable electronics with flexibility and high sensitivity have received increasing attention in the fields of health monitoring, flexible robots, and artificial intelligence. Here, a flexible organic–inorganic hybrid composite for wearable electronics application based on (00l)-aligned BaTiO3 (BT) single-crystal microplatelets is prepared by layer-by-layer self-assembly technology. For the polyvinylidene fluoride-trifluoroethylene (P(VDF-TrFE))/BT single-crystal microplatelets composite film, the sensitivity is nearly 20 times higher than that of its counterparts of P(VDF-TrFE)/BT microparticles composite film and pure P(VDF-TrFE) film. The orderly alignment of BT microplatelets also has been found advantageous to the strength of the composite film. The tensile strength is up to 204.3 MPa even at a high inorganic phase content of 53.8 wt% in P(VDF-TrFE)/BT single-crystal microplatelets composite film, which is four times that of pure P(VDF-TrFE) film. Moreover, the flexible piezoelectric wearable device based on P(VDF-TrFE)/BT single-crystal microplatelets film effectively provides detailed information for monitoring human activities such as pronunciation, frequency, and waveform of pulse beating, and motion states. This high sensitivity, high strength, and flexible piezoelectric composite provides much potential on the applications of wearable equipments and health monitoring devices.
关键词： organic–inorganic hybrids,wearable sensors,flexible piezoelectric composites,BaTiO3
更新于2025-11-21 11:01:37
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Ultra-flexible perovskite solar cells with crumpling durability: toward a wearable power source
摘要： Perovskite materials hold great potential as photovoltaic power sources for portable devices owing to their mechanical flexibility and high performance; however, the flexibility and e?ciency require further improvement to attain practical viability. We investigated the mechanical fracture behavior of polycrystalline perovskite films by varying the substrate thickness and applying the neutral plane concept. This enabled us to fabricate a crack-free perovskite film on an ultra-thin substrate (B2.5 mm) and to demonstrate ultra-flexible solar cells with high e?ciency (17.03%) with unprecedented flexibility sustained after 10 000 cycles of bending at a 0.5 mm radius. This represents a high e?ciency of 13.6% for large-area flexible perovskite solar cells (1.2 cm2), fabricated by using a hybrid transparent electrode composed of a metal mesh grid and conducting polymer. Using a protective layer to achieve the neutral plane concept, our ultra-flexible perovskite solar cells are demonstrated to be durable even after 100 crumpling cycles. Our approach paves the way to fabricate flexible perovskite solar cells for portable power sources.
关键词： wearable power source,Perovskite solar cells,mechanical durability,neutral plane concept,flexible
更新于2025-11-21 10:59:37
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Deposition of TiO <sub/>2</sub> photocatalyst on polyethylene terephthalate or polyimide polymer films by reactive sputtering for flexible photocatalytic sheets
摘要： Polycrystalline anatase TiO2 films were deposited by rf reactive magnetron sputtering on polyethylene terephthalate (PET) or polyimide (PI) films with different buffer layers, such as SiO2 or Zn2SnOx (ZTO) between the TiO2 film and the substrate. Such TiO2/(SiO2 or ZTO)/(PET or PI) sheets with high transmittance in the visible region of light performed high photo-decomposition ability of CH3CHO under the UV irradiation of the black light centered at 352 nm. In the case of using SiO2 as the buffer layer, “nano-pore layer” was observed clearly in full area of the polymer substrates close to the buffer layers after the UV irradiation, whereas such degradation was suppressed drastically in the case of using ZTO as the buffer layer. Such photocatalytic sheets performed also photo-induced hydrophilicity by the UV irradiation, where the contact angle to pure water became around 5O under the UV irradiation. After additional deposition of SiO2 by the reactive sputtering under rather high total gas pressure of 3.0 Pa on the outermost surface of the TiO2 films, the photo-induced hydrophilicity was maintained for more than 98 days in the dark. Such 3-layerd SiO2/TiO2/ZTO on PET or PI substrates should be the promising flexible photocatalytic sheets with the retentional photo-induced hydrophilicity.
关键词： PET,TiO2,Photocatalyst,PI,Reactive Sputtering,Flexible substrate
更新于2025-11-19 16:51:07
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Manufacturing of All Inkjet-Printed Organic Photovoltaic Cell Arrays and Evaluating their Suitability for Flexible Electronics
摘要： The generation of electrical energy depending on renewable sources is rapidly growing and gaining serious attention due to its green sustainability. With fewer adverse impacts on the environment, the sun is considered as a nearly infinite source of renewable energy in the production of electrical energy using photovoltaic devices. On the other end, organic photovoltaic (OPV) is the class of solar cells that offers several advantages such as mechanical flexibility, solution processability, environmental friendliness, and being lightweight. In this research, we demonstrate the manufacturing route for printed OPV device arrays based on conventional architecture and using inkjet printing technology over an industrial platform. Inkjet technology is presently considered to be one of the most matured digital manufacturing technologies because it offers inherent additive nature and last stage customization flexibility (if the main goal is to obtain custom design devices). In this research paper, commercially available electronically functional inks were carefully selected and then implemented to show the importance of compatibility between OPV material stacks and the device architecture. One of the main outcomes of this work is that the manufacturing of the OPV devices was accomplished using inkjet technology in massive numbers ranging up to 1500 containing different device sizes, all of which were deposited on a flexible polymeric film and under normal atmospheric conditions. In this investigation, it was found that with a set of correct functional materials and architecture, a manufacturing yield of more than 85% could be accomplished, which would reflect high manufacturing repeatability, deposition accuracy, and processability of the inkjet technology.
关键词： inkjet technology,flexible electronics,organic photovoltaics,Indium Tin Oxide (ITO) free solar cells
更新于2025-11-14 17:28:48
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Colloidal-Quantum-Dot-in-Perovskite Nanowires
摘要： Colloidal quantum dots are materials of interest in infrared detection – a consequence of their near-infrared light harvesting capability, tunable bandgap, and solution-processing. Herein we develop a quantum-dot-in-perovskite-nanowire consisting of PbS quantum dots embedded inside MAPbI3 nanowires. The kinetics of perovskite nanowire growth were tracked. We found that N, N-dimethylformamide induced the formation of perovskite nanowires, and that their growth was accelerated upon PbS quantum dot inclusion. We then used this nanocomposite to fabricate photodetectors that showed a light response from the visible to near infrared region up to 940 nm. Finally, a flexible photodetector was fabricated on a polyethylene terephthalate substrate.
关键词： MAPbI3 nanowires,flexible photodetector,PbS quantum dots
更新于2025-11-14 17:04:02
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Resistive switching behavior and mechanism in flexible TiO2@Cf memristor crossbars
摘要： Fiber-based memristors are expected to be one of the most ideal candidates to the future wearable nonvolatile devices. In this work, Carbon fibers coated with rutile TiO2 nanorods (TiO2 NRs) were prepared via hydrothermal method, which were denoted as TiO2@Cf. Flexible TiO2@Cf memristor crossbar was facilely assembled on a polyimide (PI) film. This device exhibited bi-directional threshold switching behavior and a maximum ON/OFF ratio of 105. In addition, the conductance of the memristors can be continuously adjusted by consecutive sweep cycles of bias voltages. The devices also exhibit excellent endurance over 1500 cycles with a negligible shift. The carriers transport and resistance switching of the TiO2@Cf memristor crossbar were explained by the Fowler-Nordheim tunneling model. The oxygen vacancies (OV) in TiO2 drifted to the interface of TiO2/Cf by an applied electric field, thereby reducing the depletion region and enhancing the current. This work provides a profound understanding of the resistive switching behavior and the related mechanism in flexible TiO2@Cf memristor crossbars, and paves a new way for potential applications for memristors in artificial synapses and flexible devices.
关键词： Artificial synapses,Oxygen vacancies,Memristor crossbars,Flexible devices,Carbon fibers
更新于2025-11-14 17:03:37
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Epitaxial Liftoff of Wafer‐Scale VO <sub/>2</sub> Nanomembranes for Flexible, Ultrasensitive Tactile Sensors
摘要： Highly sensitive tactile sensors with long-term stability and low power consumption are one of the key components for flexible electronics. Here, for the first time, the fabrication of VO2 nanomembrane tactile sensors by epitaxial liftoff from ZnO sacrificial layer is reported. The wafer-scale nanomembranes inherit the structural and electrical properties of the as-grown films, and the wet transfer generates negligible influence on the quality of VO2. Most importantly, giant electrical responses to external strains are found due to the release of substrate clamping, and a high gauge factor up to ≈1100 is derived. Furthermore, the electrical properties show no deterioration after repeatedly bending the nanomembranes for 10 000 times at a radius of 1 cm. The VO2 nanomembrane sensors are utilized to monitor the radial artery pulse, and totally reproducible waveforms with ultrahigh sensitivity to the tactile stimuli are observed. Moreover, the power dissipation of the VO2 tactile sensors can be lowered down to the picowatt level, allowing for the future construction of self-powered sensing systems together with nanogenerators. This study provides a substantial step toward large-scale preparation of oxide nanomembranes and therefore paves a promising way for flexible oxide electronics.
关键词： flexible electronics,piezoresistivity,vanadium dioxide,tactile sensors,epitaxial liftoff
更新于2025-11-14 17:03:37