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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） ▾

  • Enhanced current density of anatase TiO2 nanowire arrays by interface connection modulation in flexible quantum dot sensitized solar cells

    摘要： The stability and photovoltaic conversion efficiency are very important issues for the industry application of flexible solar cells, which have been seriously limited by the interface connection of basic photo-electrodes in solar cells. Here, one-dimensional TiO2 nanowire arrays films were employed as photo-electrodes of flexible solar cells, which have modulated interface connection of the photo-electrodes by introducing small size of nanoparticles and heating pressure process. The charge generation and separation properties of photo-electrodes have been influenced, which may be attributed by the changes on band energy of small size of nanoparticles in photo-electrodes. With the improvement on the interface connection in the photo-electrodes, the charge transfer property has been effectively improved, which have exhibited a higher current density value of the solar cells, achieving photovoltaic conversion efficiency enhancement from 2.55% to 3.90%. Moreover, there have no obvious changes on the photovoltaic conversion efficiency of these flexible QDSSCs solar cells under the curling condition.

    关键词： Anatase TiO2 nanowire arrays,Flexible quantum dot sensitized solar cell,Interface connection,Photovoltaic performance enhancement,Small size of nanoparticles,Heating pressure

    更新于2025-09-23 15:19:57

  • [IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - High-Efficiency Corrugated Monocrystalline Silicon Solar Cells with Multi-Directional Flexing Capabilities

    摘要： High efficiency, lightweight and low cost flexible solar cells have attracted a growing interest in the last decades due to their increased applications. Here, we show high-efficiency (19%) and large scale (5 × 5 inch wafer) monocrystalline silicon solar cells with multi-directional flexing capabilities. The flexing of rigid solar cells with interdigitated back contacts is achieved using a photolithography-less corrugation technique. Results show that linear patterns enable flexibility in one direction with a minimum bending radius of 5 mm while diamond patterns result in multi-directional flexibility with different minimum bending radii and robust electrical performance.

    关键词： monocrystalline silicon,multi-directional flexing,flexible solar cells,corrugation technique,high efficiency

    更新于2025-09-23 15:19:57

  • Flexible and Selfa??Powered Photodetector Arrays Based on Alla??Inorganic CsPbBr <sub/>3</sub> Quantum Dots

    摘要： Flexible devices are garnering substantial interest owing to their potential for wearable and portable applications. Here, flexible and self-powered photodetector arrays based on all-inorganic perovskite quantum dots (QDs) are reported. CsBr/KBr-mediated CsPbBr3 QDs possess improved surface morphology and crystallinity with reduced defect densities, in comparison with the pristine ones. Systematic material characterizations reveal enhanced carrier transport, photoluminescence efficiency, and carrier lifetime of the CsBr/KBr-mediated CsPbBr3 QDs. Flexible photodetector arrays fabricated with an optimum CsBr/KBr treatment demonstrate a high open-circuit voltage of 1.3 V, responsivity of 10.1 A W?1, specific detectivity of 9.35 × 1013 Jones, and on/off ratio up to ≈104. Particularly, such performance is achieved under the self-powered operation mode. Furthermore, outstanding flexibility and electrical stability with negligible degradation after 1600 bending cycles (up to 60°) are demonstrated. More importantly, the flexible detector arrays exhibit uniform photoresponse distribution, which is of much significance for practical imaging systems, and thus promotes the practical deployment of perovskite products.

    关键词： self-powered devices,perovskites,flexible devices,photodetector arrays

    更新于2025-09-23 15:19:57

  • Lasera??Printed, Flexible Graphene Pressure Sensors

    摘要： While the outstanding properties of graphene have attracted a lot of attention, one of the major bottlenecks of its widespread usage is its availability in large volumes. Laser printing graphene on polyimide films is an efficient single-step fabrication process that can remedy this issue. A laser-printed, flexible pressure sensor is developed utilizing the piezoresistive effect of 3D porous graphene. The pressure sensors performance can be easily adjusted via the geometrical parameters. They have a sensitivity in the range of 1.23 × 10?3 kPa and feature a high resolution with a detection limit of 10 Pa in combination with an extremely wide dynamic range of at least 20 MPa. They also provide excellent long-term stability of at least 15 000 cycles. The biocompatibility of laser-induced graphene is also evaluated by cytotoxicity assays and fluorescent staining, which show an insignificant drop in viability. Polymethyl methacrylate coating is particularly useful for underwater applications, protecting the sensors from biofouling and shunt currents, and enable operation at a depth of 2 km in highly saline Red Sea water. Due to its features, the sensors are a prime choice for multiple healthcare applications; for example, they are used for heart rate monitoring, plantar pressure measurements, and tactile sensing.

    关键词： laser printing,graphene,flexible devices,wearables,piezoresistive materials,pressure sensors

    更新于2025-09-23 15:19:57

  • Direct printing of performance tunable strain sensor via nanoparticle laser patterning process

    摘要： Flexible electronics are attractive because of flexibility and portability. The circuits are printed on flexible substrates, which are delicate and heat-sensitive. Traditional photolithography, which uses high temperatures and corrosive chemicals, easily causes damages in flexible substrates. Here, we develop a low-cost nanoparticle based laser patterning process for fabrication of flexible electronics. Nanoparticles are sintered using a low-power laser as they are selectively deposited. Copper and silver particles were successfully deposited on paper and polyethylene terephthalate substrates. The effects of process parameters on deposition performance were studied to understand the process-structure–property relationship. The thermal effects of the laser on film morphology were observed. The sensitivities of the electrical properties with respect to the porosities at different laser power densities were analysed. With different laser energy levels, the process allows for selective deposition, properties control of printed patterns, and flexible substrate cutting. The fabrications of strain sensor and kirigami electronics were demonstrated.

    关键词： strain sensor,electrical properties,hybrid manufacturing,Nanoparticle deposition,flexible electronics,process-structure–property relationship

    更新于2025-09-23 15:19:57

  • Highly efficient flexible perovskite solar cells made via ultrasonic vibration assisted room temperature cold sintering

    摘要： With emerging flexible substrates, perovskite solar cells have entered into a new stage of development toward flexibility, portability and miniaturization. However, this promising landscape is hindered by the necessity the high-temperature processes. In this study, a highly efficient, stable and flexible planar perovskite solar cell is fabricated using an all-room temperature pathway. First, a nanocrystalline SnO2 layer is deposited on polyethylene terephthalate/indium tin oxide via room-temperature sol-gel strategy. Then (FAPbI3)0.85(MAPbBr3)0.15 is coated thereon, by annealing-free solution deposition. In both steps films are subjected to ultrasonic vibration, right after deposition, while they are still wet. By virtue of the ultrasonic energy, surface evaporation of liquid molecules is accelerated, impurities are removed from deposited wet film, and as a result shrinkage and sintering occur at room temperature. The cell is completed by a classical method, showing a champion power conversion efficiency of 17.38%, based on 0.16 cm2 active area. After 480 h aging in 50% relative humidity, this cell retains 80% of its initial performance. This research promises efficient, inexpensive and sustainable systems for harvesting solar energy by wearable modules.

    关键词： SnO2,Cold sintering,Ultrasonic vibration,Perovskite solar cells,Flexible

    更新于2025-09-23 15:19:57

  • Radiation effects on the performance of flexible perovskite solar cells for space applications

    摘要： Solar cells for space applications are required to be tolerant to harsh environmental conditions. Especially, tolerance against radiation and charged particles is mandatory. Here we study the effect of low-energy (<< 1 MeV) proton radiation to evaluate the radiation tolerance of flexible perovskite solar cells (PSCs). Low-energy protons are more likely to be stopped in the shallower regions of solar cells, thereby causing greater performance degradation than high-energy protons. Flexible PSCs with layer sequence PET/ITO/PEDOT:PSS/perovskite/PCBM/BCP/metal were fabricated and were irradiated with 100 keV protons (fluence from ~ 3 × 1010 to ~ 3 × 1012 protons/cm2, equating several years in space). Flexible PSCs exhibited a good radiation tolerance and did not show color center formation, revealing their outstanding resistance against low-energy proton radiation. This can be credited to the combined effect of intrinsically large carrier diffusion length exceeding the thin absorber film thickness and the defect tolerance of perovskite crystals.

    关键词： defect tolerance,space applications,radiation tolerance,low-energy proton radiation,flexible perovskite solar cells

    更新于2025-09-23 15:19:57

  • Flexible organic lighta??emittinga??diodea??based photonic skin for attachable phototherapeutics

    摘要： Phototherapeutics is both safely noninvasive and can be employed to treat a light variety of sites and diseases. Current rigid and bulky conventional light sources, such as LED or laser-based phototherapy devices, are difficult to transport and use for regular irradiation treatments. To solve this problem, flexible organic light-emitting diode (OLED) light sources are the best candidates, and if applied very thinly as a skin-like platform, the ultimate attachable phototherapeutics can be realized. We demonstrated a very thin flexible OLED-based photonic skin with a total thickness of 6 μm for application in attachable phototherapeutics. It was optimized by controlling the peak wavelengths (600–700 nm) and irradiation interval of the flexible OLED thus improving the regeneration effect of the artificial skin by up to 70%. In addition, when the flexible OLED-based photonic skin was attached to a dressing film before being applied to the skin, it delivered the same electro-optical properties, while protecting against external contamination. The OLED skin on the dressing film had an operating lifetime of more than 100 h. These results confirmed the applicability of flexible OLED-based photonic skin to various light treatment areas, such as surgical wounds that require periodic irradiation.

    关键词： wound-healing,regeneration,photonic Skin,dressing,flexible OLED,phototherapeutics

    更新于2025-09-23 15:19:57

  • Electrodeposition of hierarchical zinc oxide nanostructures on metal meshes as photoanodes for flexible dye-sensitized solar cells

    摘要： Hierarchical zinc oxide (ZnO) nanorod arrays (ZNRAs) were fabricated on stainless steel meshes via a two-step electrodeposition approach as flexible dye-sensitized solar cells (DSSCs) photoanodes. The two-step electrodeposition was realized by deposition of primary ZNRAs followed by growth of secondary branched ZnO nanorods on the primary ZnO nanorods surfaces. The morphologies of ZNRAs and the photovoltaic performances of the assembled DSSCs with different deposition conditions of primary ZNRAs were compared in detail. After modulating electrodeposition conditions, the DSSC assembled with hierarchical ZNRAs obtained an optimum photovoltaic performance with power conversion efficiency of 1.81 %.

    关键词： Electrodeposition,Zinc oxide,Stainless steel mesh,Dye-sensitized solar cells,Flexible photovoltaic devices

    更新于2025-09-23 15:19:57

  • Blue laser-induced photochemical synthesis of CuAg nanoalloys on h-BN supports with enhanced SERS activity for trace-detection of residual pesticides on tomatoes

    摘要： The copper (Cu)-based nanoalloys loaded on graphene-like nanoplates have a great promise for boosting surface-enhanced Raman scattering spectroscopy (SERS), due to low-cost Cu species in comparison with noble metals and unique additional Raman enhancement originated from two-dimensional (2D) supports. Herein, we report an ingenious strategy to load highly dense and monodisperse CuAg nanoalloys (NAs) on hexagonal boron nitride (h-BN) by blue laser (405 nm) -induced photochemical reaction. Without the aid of any complex auxiliary reagents, the co-reduction of Cu and Ag ions is driven by photon-excited electron on semiconductor h-BN, resulting in the coalescence and overgrowth of “clean” CuAg NAs. As expected, the proposed h-BN/CuAg NAs provide ultrahigh SERS activity with the limit of detections (LODs) of crystal violet (CV) at femtomole level (~10?16 M), thiram and tricyclazole at pico-molar (10?12 M) and nanomolar levels (10?9 M), respectively. Most importantly, the as-prepared h-BN/CuAg NAs were also directly combined with polyethylene terephthalate (PET) by simple dripping and drying processes to form uniform flexible substrates. The low-cost Cu-based flexible substrates can be used to realize the ultrasensitive SERS detection of residual tricyclazole on tomato surfaces, thus facilitating the widespread precise assessment of pesticide residues in various practical applications.

    关键词： CuAg nanoalloys,Pesticide detection,SERS analyses,Flexible SERS substrate,Photochemical reaction

    更新于2025-09-23 15:19:57