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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • Flexible display
  • fabrication process
  • electrowetting
  • PEN substrate
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • South China Normal University
400 条数据
?? 中文（中国） ▾

  • Graphdiynea??Based Flexible Photodetectors with High Responsivity and Detectivity

    摘要： Graphdiyne (GDY), a newly emerging 2D carbon allotrope, has been widely explored in various fields owing to its outstanding electronic properties such as the intrinsic bandgap and high carrier mobility. Herein, GDY-based photoelectrochemical-type photodetection is realized by spin-coating ultrathin GDY nanosheets onto flexible poly(ethylene terephthalate) (PET) substrates. The GDY-based photodetectors (PDs) demonstrate excellent photo-responsive behaviors with high photocurrent (Pph, 5.98 μA cm-2), photoresponsivity (Rph, 1086.96 μA W-1), detectivity (7.31 × 1010 Jones), and excellent long-term stability (more than 1 month). More importantly, the PDs maintain an excellent Pph after 1000 cycles of bending (4.45 μA cm-2) and twisting (3.85 μA cm-2), thanks to the great flexibility of the GDY structure that is compatible with the flexible PET substrate. Density functional theory (DFT) calculations are adopted to explore the electronic characteristics of GDY, which provides evidence for the performance enhancement of GDY in alkaline electrolyte. In this way, the GDY-based flexible PDs can enrich the fundamental study of GDY and pave the way for the exploration of GDY heterojunction-based photodetection.

    关键词： photoelectrochemical,photodetection,graphdiyne,flexible devices,long-term stability

    更新于2025-09-23 15:19:57

  • A Novel 2D Perovskite as Surface a??Patchesa?? for Efficient Flexible Perovskite Solar Cells

    摘要： Two-dimensional (2D) perovskites are promising passivating materials to improve the photovoltaic performance and stability of lead halide perovskite solar cells (PSCs). In this work, we report a novel mixed 2D perovskite based on phenylformamidinium (PFA) cations and formamidinium (FA) cations as surface “patches” to stabilize an FA-based perovskite, whose formula is Cs0.05Rb0.05(FA0.83MA0.17)Pb(I0.95Br0.05)3. The mixed-cation 2D perovskite “patches” can be obtained by dripping a PFA iodide (PFAI) solution (≥ 6 mg/mL) dynamically on the FA-based perovskite film surface. The mixed-cation 2D perovskite can effectively reduce the perovskite surface defects and suppress the recombination at the interface between the perovskite layer and the hole transport layer, which results in improved device performance and thermal stability. Our champion flexible PSC presents a power conversion efficiency (PCE) of 19.89%, which is one of the highest reported values for single-junction flexible PSCs to date. The unencapsulated flexible device with the “patches” retains 70.4% of its initial efficiency after 1000 h at 85 °C in an N2 environment. Our new strategy demonstrates a highly promising way to passivate the FA-based perovskite surface for highly-efficient PSCs, particularly flexible PSCs.

    关键词： 2D perovskite,grain boundary,passivation,flexible,perovskite solar cells

    更新于2025-09-23 15:19:57

  • A Thina??Film Flexible Defecta??Mode Laser

    摘要： Laser emission from a flexible defect-mode structure consisting of two photopolymerized liquid crystal thin films separated by a dye-doped polymethylmethacrylate defect layer is demonstrated. A simple and cost-effective film transfer technique is used to fabricate the flexible laser and the corresponding laser emission characteristics, which shows single-mode laser emission at λ = 582 nm, with an excitation threshold of Eth = 12.3 ± 0.5 μJ cm?2 per pulse and a slope efficiency of ηs = 6.0 ± 0.3%, are presented. The polarization state of the laser emission are also presented and are compared with the findings reported in the literature. Finally, laser-beam steering is demonstrated up to 42° by subjecting the device to a mechanically induced deformation that creates a radius of curvature of 5 mm, which is of potential interest for conformable and wearable technology platforms.

    关键词： thin-film lasers,liquid crystals,flexible lasers,defect-mode lasers

    更新于2025-09-23 15:19:57

  • A flexible and ultra-broadband terahertz wave absorber based on graphenea??vertically aligned carbon nanotube hybrids

    摘要： Electromagnetic wave absorbers are essential devices in imaging, wireless communication and energy harvesting systems. In this paper, we propose and experimentally demonstrate a flexible and ultra-broadband terahertz (THz) wave absorber based on graphene-vertically aligned carbon nanotube (G-VACNT) hybrids. The THz absorber consists of Cu/PDMS/graphene/VACNT functional layers on PET substrate. Measured results show a 100% qualified operating bandwidth (i.e., absorptance >0.9) and an average power absorptance of 0.986 within the 0.2-3.0 THz range. The absorber also exhibits good absorption performances for a wide range of incident angles up to 60°, and can function normally in different bending states due to its excellent flexibility. The incoming energy of THz waves absorbed by the G-VACNT hybrids results in a temperature increase whose spatial distribution is corresponding to the profile of incident THz beam, providing an efficient and low cost approach for THz beam profiling, collimation and focusing. This work paves the way for the development of large-scale and broadband THz wave absorbers.

    关键词： Vertically aligned carbon nanotube,Ultra-broadband,Graphene,Flexible,Terahertz wave absorber

    更新于2025-09-23 15:19:57

  • SbSI microrod based flexible photodetectors

    摘要： In this paper, SbSI microrods is prepared by using a simple hydrothermal method via sulfur powder as sulfur source. The as-synthesized SbSI microrods with sulfur as sulfur powder source has better flexibility than that of SbSI with thiourea as sulfur source due to decreasing force constant between Sb and S atom. SbSI microrod based flexible photodetectors exhibit higher specific detectivity of up to 5.43×1010 Jones, fast response speed (rise time and fall time of 61 ms and 128 ms, respectively) and also show low dark current less than 50 pA. Especially, the photoresponse performance of the SbSI microrod based flexible photodetectors are almost unchanged after different bending curvatures and bending times more than 2000 times.

    关键词： higher specific detectivity,fast response speed,SbSI microrods,flexible photodetector

    更新于2025-09-23 15:19:57

  • [IEEE 2018 7th Electronic System-Integration Technology Conference (ESTC) - Dresden, Germany (2018.9.18-2018.9.21)] 2018 7th Electronic System-Integration Technology Conference (ESTC) - Hybrid (PI-PDMS) Superhydrophobic Wearable Dry-Patching Flexible and Transparent Substrate

    摘要： The hybrid thin film is fabricated by using polyimide (PI) and Polydimethylsiloxane (PDMS) to take combined advantages of their transparency, thermal stability and stretchability. Furthermore, another importance of such subtract is superhydrophobicity, having highly water repellent, dustproof and self-cleaning effect which is beneficial for its long-term performance. The demand for dry patching has been increased as compared with wet patching films due to optical transmittance and long term optimization, the patching devices mechanism for those devices can be mechanical deformation experienced with bending, pressing, twisting and pressing, without any compromise on the comfort of the user, those mechanical characteristics leads towards the adhesion of the substrate via van der Waals force without using any wet adhesion. The actively explored field of flexible and wearable applications are in healthcare and artificial electronic skins which are interestingly capable of detecting stress, strain, pain and temperature in real-time health monitoring. Since superhydrophobic properties combine with dry patching techniques provide a wide range of practical applications for the platform of the wearable dry patching substrate, it is expected that such works have an impact on flexible hybrid electronic (FHE) devices which can be rolled, stretched patching superhydrophobic substrate utilizing a polymer casting method showing a static CA and CAH angle of 179° and 10°, respectively, by creating the air pocket between the micro pillars (30μm) which counterbalances the water droplet on the surface. Such hybrid in microelectronics applications; it provides more desirable properties in many fields of application (mechanical, thermal, optical and chemical). In this article, we discussed the fabrication of a dry-patching substrate using hybrid film that has a superhydrophobic surface substrates are widely used bent. The fabricated and dry.

    关键词： Wearable Devices,Dry Patching,Flexible,Self-Cleaning,Superhydrophobic,Low Hysteresis

    更新于2025-09-23 15:19:57

  • A novel design of poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate)/molybdenum disulfide/poly (3,4-ethylenedioxythiophene) nanocomposites for fabric micro-supercapacitors with favourable performances

    摘要： Fabric supercapacitors with mechanical flexible and excellent energy storage capacity attract considerable attention for the potential application in wearable smart electronics. A novel ternary composite electrode and assembled all-solid-state fabric supercapacitors are expected to achieve favorable electrochemical performances. The facile vapor phase polymerization method is employed to fabricate the ternary poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate)/molybdenum disulfide/poly (3,4-ethylenedioxythiophene) composite electrodes. The molybdenum disulfide nanograins are incorporated into the conducting polymer matrix which further facilitates the formation of hierarchical porous structures. On account of profitable synergistic effect among three-component materials and porous structure with reinforced electronic/ionic transport, the as-prepared hybrid electrode exhibits a high areal capacitance of 51.01 mF/cm2 at current density of 0.1 mA/cm2, as well as long cycling durability with 93.6% capacitance retention after 5000 cycles of galvanostatic charge/discharge tests. Furthermore, symmetric fabric micro-supercapacitor assembled by the as-prepared electrodes is also evaluated in a belt-shaped device. This assembled device exhibits an energy density of 0.2 μWh/cm2 (1.81 mWh/cm3) and the power density of 0.09 mW/cm2 (0.82 W/cm3). These results of excellent flexibility and favourable capacitive performance indicate a promising application in portable and wearable electronic devices.

    关键词： synergistic effect,ternary nanocomposites,porous structure,flexible micro-supercapacitors

    更新于2025-09-23 15:19:57

  • Flexible β-Ga <sub/>2</sub> O <sub/>3</sub> Nanomembrane Schottky Barrier Diodes

    摘要： Here, high power flexible Schottky barrier diodes (SBDs) are demonstrated on a plastic substrate using single crystalline β-Ga2O3 nanomembranes (NMs). In order to realize flexible high power β-Ga2O3 SBDs, sub-micron thick freestanding β-Ga2O3 NMs are created from a bulk β-Ga2O3 substrate and transfer-printed onto the plastic substrate via a microtransfer printing method. It is revealed that the material property of β-Ga2O3 NMs such as crystal structure, electron affinity, and bandgap remains unchanged compared with its bulk properties. Flexible β-Ga2O3 SBDs exhibit the record high critical breakdown field strength (Ec) of 1.2 MV cm?1 in the flat condition and 1.07 MV cm?1 of Ec under the bending condition. Overall, flexible β-Ga2O3 SBDs offer great promise for future flexible energy convergence systems and are expected to provide a much larger and more versatile platform to address a broader range of high-performance flexible applications.

    关键词： flexible Schottky barrier diodes,high power flexible electronics,β-Ga2O3 nanomembrane

    更新于2025-09-19 17:15:36

  • Configurable Multi-State Non-volatile Memory Behaviors in Ti <sub/>3</sub> C <sub/>2</sub> Nanosheets

    摘要： MXenes have drawn considerable attention in both academia and industry due to the attracting properties such as the combination of metallic conductivity and surface hydrophilicity. However, to the best of our knowledge, the potential use of MXenes in non-volatile resistive random access memories (RRAMs) has rarely been reported. In this paper, we have firstly demonstrated the RRAM device with the MXene (Ti3C2) as the active component. The Ti3C2-based RRAM exhibits a typical bipolar switching behavior, long retention characteristic, low SET voltage, good mechanical stability and excellent reliability. By adjusting different compliance current in the SET process, the multi-state information storage could be achieved. The charge trapping assist hopping process is considered to be the main mechanism of resistive switching of this fabricated Ti3C2-based RRAM, which is verified by conductive atomic force microscopy (C-AFM) and Kelvin probe force microscopy (KPFM). Moreover, the flexible Ti3C2-based RRAM with good mechanical stability and long retention property could be successfully fabricated using on plastic substrate. Ti3C2-based RRAM may open the door to additional applications and functionalities with the highly potential application in flexible electronics.

    关键词： MXenes,non-volatile memory,flexible electronics,resistive random access memory,Ti3C2,multi-state storage

    更新于2025-09-19 17:15:36

  • Solution-shearing-processed flexible polymer solar mini sub-modules fabricated on an embedded silver-grid substrate

    摘要： A flexible transparent electrode film is fabricated by coating the conductive polymer PEDOT:PSS using a solution-shearing process on PET film in which silver nanoparticles are embedded in intaglio grids patterned by a roll-to-roll thermal imprinting method. The composite electrode shows a sheet resistance of 20 Ω square?1 and a light transmittance of 82.9% at room temperature. An all-solution polymer solar mini sub-module is fabricated on the flexible electrode by further depositing ZnO and P3HT:PC61BM layers using the optimized solution-shearing process with subsequent printing of PEDOT:PSS and flat-screen printing of silver. The structure and morphology of the solution-shearing processed films examined by XRD and AFM show smoother surfaces and higher crystallinity than those of conventional spin-coated films. The solution-shearing-processed flexible polymer solar mini sub-module fabricated on an area of 36 cm2 shows a power conversion efficiency of 1.87% under an AM 1.5G solar simulator. Therefore, the solution-shearing process toward large-area flexible polymer solar module fabrication is successfully demonstrated.

    关键词： Solution-shearing coating,Solar mini sub-module,Flexible transparent substrate,Large-area process

    更新于2025-09-19 17:15:36