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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
  • CNT cold cathode
  • High brightness
  • Electron microscopy
应用领域
  • Optoelectronic Information Science and Engineering
机构单位
  • Kyung Hee University
34 条数据
?? 中文（中国） ▾

  • AlGaAs/GaAs solar cell with CNT transport layer: numerical simulation

    摘要： AlGaAs/GaAs solar cells (SC) was modeled. Conventional SC was compared with structure with the thinner emitter. SC with additional CNT transport layer was simulated and compared with SC without it. The simulation was carried out with different geometry of the contacts and light flux. CNT transport layer has allowed achieving an increase in SCs efficiency up to 1.7% compared with metal contact grid.

    关键词： CNT transport layer,numerical simulation,AlGaAs/GaAs solar cell

    更新于2025-09-16 10:30:52

  • [IEEE 2019 IEEE International Conference on Intelligent Techniques in Control, Optimization and Signal Processing (INCOS) - Tamilnadu, India (2019.4.11-2019.4.13)] 2019 IEEE International Conference on Intelligent Techniques in Control, Optimization and Signal Processing (INCOS) - Implementation of MPPT for Flexible Solar Cells embedded on Unmanned Aerial Vehicles

    摘要： This paper presents a Maximum Power Point Tracking (MPPT)method for a flexible organic polymer solar cell (FOPSC) under varyingshading condition. FOPSC was fabricated using a composite of three conjugated polymers namely PFO, PEO-at-co-MEH-PPV, and MEH-PPV as active layer, CNT/rGO composite as counter electrode (CE), substratemade of Poly-Ethylene Terephthalate (PET). The fabricated OPSC showed around 0.69 asfill factor (FF), a 0.67 V of voltage at open circuit condition(Voc), a 6.37% of 13.69 power mA/cm2 circuit density condition.The PCE of OPSC was comparable to that of OPSC with Pt CE (η = 7.82%).Four OPSC strips where connected in series, aground-based UAV model and different shading conditions were recreated and the power to voltage relationships were obtained. Based on the experimental data obtained, a MPPT techniques was developed using second order derivative of output voltagewith respect to duty cycle The buck a ratio PWM controlled using a microcontroller to implement the D2VOC based MPPT.

    关键词： MPPT and UAV,TEM,organic polymer solar cell,CNT/rGO composite,second order derivative of output voltagewith respect to duty cycle ratio (D2VOC),FEM

    更新于2025-09-16 10:30:52

  • [IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Modeling Methodology for Determining Energy Collection Potential of Photovoltaics Applied To Curved Surfaces

    摘要： Arrays of periodic one-dimensional nanomaterials offer tunable optical properties in terms of light–matter interaction which are attractive for designing efficient optoelectronic devices. This paper presents a fabrication of bottom-up grown nanopillar (NP) array solar cells based on n-i-p thin-film amorphous silicon using scaffolds of vertically aligned carbon nanotube (CNT) array. The effects of varying the CNT spacing over the range from 800 to 2000 nm on optical and electrical properties of the solar cells were investigated. The NP solar cell with CNT spacing of 800 nm exhibited ‘moth-eye’ broadband antireflection behavior, showing an average reflectance value lower than 10%. The enhanced optical absorption translated to significant enhancements in photocurrent and quantum efficiency compared to a conventional planar solar cell under low light condition. The open-circuit voltage (Voc) of the NP solar cell was found systematically correlated with the CNT spacing and the illumination condition. The results presented here is of importance for developing high efficiency one-dimensional nanostructured solar cells.

    关键词： photovoltaic cells,nanostructured materials,nanophotonics,Amorphous silicon,carbon nanotube (CNT)

    更新于2025-09-16 10:30:52

  • Surface modification of carbon nanotubes for the synthesis of CNTs/ZnS quantum dot composites via electrophoretic deposition route

    摘要： In the present study, carbon nanotube (CNT)/zinc sulfide (ZnS) quantum dots (QDs) were synthesized followed by electrophoretic deposition on Al electrodes. First, surface of carbon nanotubes were modified using wet chemical routes to obtain Carboxyl-, Chlorine- and Amine-CNTs. Although deposition weight of CNTs were improved considerably by surface modification, it decreased dramatically after attachment of ZnS QDs. Microstructure studies showed that a better coverage has been obtained on the Al substrate by the continuous layer of Carboxyl-modified CNTs. Moreover, ZnS QDs were coated on the surface of Carboxyl-modified CNTs properly.

    关键词： functionalizing,CNT,Zinc Sulfide,quantum dots,electrophoretic deposition

    更新于2025-09-12 10:27:22

  • A Comparison Between Functions of Carbon Nanotube and Reduced Graphene Oxide and Respective Ameliorated Derivatives in Perovskite Solar Cells

    摘要： The reduced graphene oxide (rGO) and carbon nanotube (CNT) components and their derivatives grafted with the irregioregular poly(3-dodecyl thiophene) (rGO-g-PDDT and CNT-g-PDDT) and regioregular poly(3-hexylthiophene) (CNT-g-P3HT and CNT-g-P3HT) polymers were used to improve the morphological, optical, and photovoltaic features of CH3NH3PbI3 perovskite solar cells. The type of carbonic material (CNT or rGO) and regioregularity of grafts affected the cell performances. According to the photoluminescence lifetimes, although the grafted-CNT/rGO components improved the cell characteristics (15.3-20.5 ns), the corresponding bared nanostructures ruined them (3.0-4.9 ns). In similar conditions, via alteration of rGO to CNT, the average cell performance changed to 14.56 from 14.07% for PDDT-grafted systems and to 16.36 from 15.15% for P3HT-based ones. The self-ordering polymers such as regioregular P3HTs simultaneously induced the crystallinity to the polymeric and non-polymeric constituents. The best photovoltaic data including 22.73 mA/cm2, 75%, 0.96 V and 16.36% with the narrowest distributions were detected in the CH3NH3PbI3 + CNT-g-P3HT solar cells. Perovskite solar cells were perfectly modified with both rGO-g-P3HT and CNT-g-P3HT agents because of the lowest charge-transfer resistance values (93.2 and 90.1 Ω), the most intensified crystalline peaks, and the largest absorbances.

    关键词： morphology,regioregularity,CNT,rGO,perovskite

    更新于2025-09-11 14:15:04

  • Printing Carbon Nanotube-embedded Silicone Elastomers via Direct Writing

    摘要： Direct writing techniques for the printing of colloidal multiwalled carbon nanotubes (CNTs) embedded in polydimethylsiloxane (PDMS) were developed herein to fabricate complex structures including woodpiles, tetragonal scaffolds, and gradient mesh structures. The multiwalled CNTs served as a conductive filler and thickening agent for the printing ink. A suitable rheological behavior was obtained by mixing the CNTs with PDMS dissolved in an isopropyl alcohol solvent. A 7 wt.% CNT loading in the PDMS was optimum for printing gap-spanning features at a nozzle speed of 20 mm/s. The printed structures, including a woodpile and gradient mesh structure, were capable of detecting changes in external mechanical pressure. Printed CNT/PDMS strips exhibit electrical actuation with good mechanical performance (strain of 8.9%) at a low actuation voltage (60 V). The performance characterization and application display demonstrated the possibility of developing custom complex CNT/PDMS structures for a broad range of applications, including soft robots and flexible electronic devices.

    关键词： polydimethylsiloxane,gap spanning features,multiwalled carbon nanotube (CNT),Direct writing,rheological behavior

    更新于2025-09-10 09:29:36

  • ZnO-CNT Nanostructures as Potential Materials for Non-Enzymatic H <sub/>2</sub> O <sub/>2</sub> Sensing

    摘要： Hydrogen peroxide (H2O2) is widely used as an antibacterial, bleaching, decoloring, and oxidizing agent in various industrial fields. However, the exposure to and accumulation of high levels of H2O2 can cause oxidative stress to humans, leading to caducity and diseases due to its unstable and toxic nature. Moreover, H2O2 is a useful indicator for monitoring reactive oxygen species-related diseases in humans because it is generated as an intermediate product of many enzymatic reactions in normal aerobic metabolism. It is therefore essential to develop accurate and reliable methods of detecting H2O2 for industrial and biological purposes. Among the recently established methodologies, non-enzymatic amperometric detection of H2O2 has raised considerable attention owing to its high sensitivity, low cost, ease of operation, and quick response. To improve the electrochemical performance of this method, various redox mediators, especially noble-metal-containing substrates, have been used to fabricate chemically modified electrodes for the non-enzymatic amperometric detection of H2O2. Recently, we have reported many applications of metal oxide-decorated sp2-hybridized carbon nanostructures. Building on our previous studies, we describe herein the use of zinc oxide–carbon nanotubes (ZnO-CNT) for the preparation of modified electrodes exhibiting enhanced electrocatalytic activity for H2O2 reduction.

    关键词： Amperometry,H2O2 reduction,ZnO nanoparticle,CNT,Biosensor

    更新于2025-09-10 09:29:36

  • Construction of Z-Scheme g-C3N4/CNT/Bi2Fe4O9 Composites with Improved Simulated-Sunlight Photocatalytic Activity for the Dye Degradation

    摘要： In this work, ternary all-solid-state Z-scheme g-C3N4/carbon nanotubes/Bi2Fe4O9 (g-C3N4/CNT/BFO) composites with enhanced photocatalytic activity were prepared by a hydrothermal method. The morphology observation shows that ternary heterojunctions are formed in the g-C3N4/CNT/BFO composites. The photocatalytic activity of the samples for the degradation of acid orange 7 was investigated under simulated sunlight irradiation. It was found that the ternary composites exhibit remarkable enhanced photocatalytic activity when compared with bare BFO and g-C3N4/BFO composites. The effect of the CNT content on the photocatalytic performance of the ternary composites was investigated. The photocatalytic mechanism of g-C3N4/CNT/BFO was proposed according to the photoelectrochemical measurement, photoluminescence, active species trapping experiment and energy-band potential analysis. The results reveal that the introduction of CNT as an excellent solid electron mediator into the ternary composites can effectively accelerate the electron migration between BFO and g-C3N4. This charge transfer process results in highly-ef?cient separation of photogenerated charges, thus leading to greatly enhanced photocatalytic activity of g-C3N4/CNT/BFO composites. Furthermore, the g-C3N4/CNT/BFO composites also exhibit highly-ef?cient photo-Fenton-like catalysis property.

    关键词： CNT,Bi2Fe4O9,photocatalysis,Z-scheme heterojunction,g-C3N4

    更新于2025-09-10 09:29:36

  • The effect of morphology and functionalization on UV detection properties of ZnO networked tetrapods and single nanowires

    摘要： Rapid detection and fast response of nanoelectronic devices based on semiconducting oxides is nowadays a modern and stringent subject of research. Device performances depend mainly on the morphologies of the metal oxide nanostructures. In the scope of this work, the influence of the structural morphology of three-dimensional (3-D) ZnO nano- and microstructured networks on the room temperature UV detection properties is studied in detail. We show that the formation of multiple potential barriers between the nanostructures, as well as the diameter of the nanostructures, which is in the same order of magnitude as the Debye length, strongly influence the UV sensing properties. Consequently, 3-D ZnO networks consisting of interconnected ultra-long wire-like tips (up to 10 μm) and with small wire diameters of 50–150 nm, demonstrated the highest UV sensing performances (UV response ratio of ～3100 at 5 V applied bias voltage). Furthermore, we demonstrate the possibility of substantially increasing the UV sensing performances of individual ZnO nanowire (NW) (diameter of ～50 nm) by surface functionalization with carbon nanotubes (CNTs), showing high response ratio (～60–50 mW/cm2), as well as fast response (～1 s) and recovery (～1 s) times. The obtained results thus provide a platform with respect to the next generation of portable UV radiation detectors based on semiconducting oxide networks.

    关键词： CNT,UV photodetector,ZnO,Device,Individual nanostructures,Nanosensor

    更新于2025-09-10 09:29:36

  • Boosted electrochemical performance of TiO2 decorated RGO/CNT hybrid nanocomposite by UV irradiation

    摘要： Titania decorated RGO/CNT hybrid electrode material was prepared for supercapacitor (SCs) application through facile hydrothermal approach. Combined act of 1D CNTs and 2D RGO assists the uniform in-situ growth of titania towards high surface area mesoporous self-assembled interconnected morphology which is confirmed from FESEM and BET surface area analysis. This interconnected porous network like structure can efficiently allow the better mass transport and decreased contact resistance towards high electrochemical utilization. Electrochemical measurements revealed the superior performance of hybrid nanocomposite comprising of titania/RGO/CNT (TG1C1) which exhibited maximum specific capacitance around 477 F/g at current density 1 A/g. However, this capacitance value was further enhanced up to 537 F/g after 1 hour of UV light irradiation. This enhancement could be ascribed to photo-catalytic effect of TiO2 and corresponding genesis of photo-excited electrons on TiO2 surface which further channelized through interconnected RGO and CNT morphology and hence results in improved specific capacitance. These observations were in good agreement with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. The hybrid nanocomposite also showed satisfying energy density and power density. It was also found that prepared hybrid nanocomposites were stable up to 2000 cycles with maximum specific capacitance retention of 92% of initial value.

    关键词： Energy storage,RGO-CNT hybrid,Titania,Specific Capacitance

    更新于2025-09-10 09:29:36