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- 2018
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- Optoelectronic Information Science and Engineering
- South China Normal University
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Hybrid Intra-hour Solar PV Power Forecasting using Statistical and Skycam-based Methods
摘要： In this paper, we propose an improved discrete artificial bee colony (DABC) algorithm to solve the hybrid flexible flowshop scheduling problem with dynamic operation skipping features in molten iron systems. First, each solution is represented by a two-vector-based solution representation, and a dynamic encoding mechanism is developed. Second, a flexible decoding strategy is designed. Next, a right-shift strategy considering the problem characteristics is developed, which can clearly improve the solution quality. In addition, several skipping and scheduling neighborhood structures are presented to balance the exploration and exploitation ability. Finally, an enhanced local search is embedded in the proposed algorithm to further improve the exploitation ability. The proposed algorithm is tested on sets of the instances that are generated based on the realistic production. Through comprehensive computational comparisons and statistical analysis, the highly effective performance of the proposed DABC algorithm is favorably compared against several presented algorithms, both in solution quality and efficiency.
关键词： dynamic operation skipping,Artificial bee colony (ABC) algorithm,hybrid flexible flowshop (HFF),heuristic
更新于2025-09-23 15:21:01
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Improving performance of ZnO flexible dye sensitized solar cell by incorporation of graphene oxide
摘要： At today great interest has been paid to hydrogen production by water electrolysis due to their simplicity and low cost. Dye sensitized solar cell are promising devices as renewable electrical power source to achieve water electrolysis because they possess high theoretical ef?ciency compared with Si based solar cells. In this research, ZnO photo catalyst was modi?ed with graphene oxide (GO) by means of high energy milling. The anode of the ?exible dye-sensitized solar cell was fabricated by electrophoretic deposition of the photo catalyst onto ?exible electrodes. The obtained materials were characterized by FTIR, XRD, XPS and SEM–EDS. The ef?ciency and ?ll factor of ZnO and ZnO–GO cells were estimated from the I–V curve, measured under simulated sunlight. The obtained results demonstrate that ZnO–GO cell have higher ef?ciency compared with the ZnO cell. The latter can be explained by the better dispersion of ZnO that enlace the dye adsorption onto the fabricated anode and by the presence of GO that improve the absorption of photons from the light.
关键词： flexible solar cells,dye sensitized solar cell,graphene oxide,ZnO,electrophoretic deposition
更新于2025-09-23 15:21:01
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Continuous-Wave Laser-Induced Transfer of Metal Nanoparticles to Arbitrary Polymer Substrates
摘要： Laser-induced forward transfer (LIFT) and selective laser sintering (SLS) are two distinct laser processes that can be applied to metal nanoparticle (NP) ink for the fabrication of a conductive layer on various substrates. A pulsed laser and a continuous-wave (CW) laser are utilized respectively in the conventional LIFT and SLS processes; however, in this study, CW laser-induced transfer of the metal NP is proposed to achieve simultaneous sintering and transfer of the metal NP to a wide range of polymer substrates. At the optimum laser parameters, it was shown that a high-quality uniform metal conductor was created on the acceptor substrate while the metal NP was sharply detached from the donor substrate, and we anticipate that such an asymmetric transfer phenomenon is related to the di?erence in the adhesion strengths. The resultant metal electrode exhibits a low resistivity that is comparable to its bulk counterpart, together with strong adhesion to the target polymer substrate. The versatility of the proposed process in terms of the target substrate and applicable metal NPs brightens its prospects as a facile manufacturing scheme for ?exible electronics.
关键词： selective laser sintering,flexible electronics,metal nanoparticle ink,laser-induced forward transfer
更新于2025-09-23 15:21:01
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An Efficient Ultra-Flexible Photo-Charging System Integrating Organic Photovoltaics and Supercapacitors
摘要： Flexible and biocompatible integrated photo-charging devices consisting of photovoltaic cells and energy storage units can provide an independent power supply for next-generation wearable electronics or biomedical devices. However, current flexible integrated devices exhibit low total energy conversion and storage efficiency and large device thickness, hindering their applicability towards efficient and stable self-powered systems. Here, a highly efficient and ultra-thin photo-charging device with a total efficiency approaching 6% and a thickness below 50 μm is reported, prepared by integrating 3-μm-thick organic photovoltaics on 40 μm-thick carbon nanotube/polymer-based supercapacitors. This flexible photo-charging capacitor delivers much higher performance compared with previous reports by tuning the electrochemical properties of the composite electrodes, which reduce the device thickness to 1/8 while improving the total efficiency by 15%. The devices also exhibit a superior operational stability (over 96% efficiency retention after 100 charge/discharge cycles for one week) and mechanical robustness (94.66% efficiency retention after 5000 times bending at a radius of around 2 mm), providing a high-power and long-term operational energy source for flexible and wearable electronics.
关键词： ultra-thin design,photo-charging-capacitors,flexible devices,integration
更新于2025-09-23 15:21:01
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[IEEE 2019 Device Research Conference (DRC) - Ann Arbor, MI, USA (2019.6.23-2019.6.26)] 2019 Device Research Conference (DRC) - High-Responsivity Flexible Photodetectors based on MOVPE-MoS <sub/>2</sub>
摘要： We have presented flexible MSM photodetectors based on MOVPE-MoS2. These photosensing devices with high dynamic ranges up to 83dB and high responsivities of up to 550 A/W at low bias make this scalable approach a perfect candidate for future optical sensors in the medical field in which bendable electronics is highly desired. The MOVPE-MoS2 on wafer scale is also interesting for MoS2 FETs with high current on/off ratios of six orders of magnitude, fabricated with standard contact lithography enabling large-scale flexible electronic circuits.
关键词： 2D materials,MoS2,MOVPE,photodetectors,flexible electronics
更新于2025-09-23 15:21:01
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Printed Higha??Density and Flexible Photodetector Arrays via Sizea??matched Heterogeneous Microa??/Nanostructure
摘要： Semiconductor/metal binary systems constitute the core components in electronic/photonic devices. The domain size of the heterostructure should be comparable to the charge diffusion length for superior photoelectric response. However, the fabrication of size-matched heterostructures is still a challenge, especially for printed devices. Here, a high-density photodetector array with lateral semiconductor/metal heterostructure is achieved via the template-assisted sequentially printing strategy. The Ag/PBDB-T:ITIC/Ag based lateral heterojunction that matches the charge diffusion length in the charge transfer process provides high light response sensitivity (D* = 3.41 × 1012 Jones, R = 12.9 A W?1). Moreover, the printed pixel interval can be decreased to 10 μm (106 pixels cm?2; resolution: 2.5 × 103 dpi). As the printing strategy can be implemented on soft substrates, the photodetector arrays are endowed with the flexibility. This work demonstrates a simple and effective strategy for chip-scale fabrication of flexible high-performance photodetectors, which validates the potential of printed heterogeneous micro-/nanostructures for integrated active electronics and optics.
关键词： flexible photodetector arrays,light imaging,sequential printing,heterostructures
更新于2025-09-23 15:21:01
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Mechanoa??Photonics: Flexible Singlea??Crystal Organic Waveguides and Circuits
摘要： Microfabrication of circuits by combining the mechanical and photonic properties of flexible crystals is imperative for flexible miniature photonic devices. The fundamental understanding of molecular packing and energetics of intermolecular interactions is vital to design crystals with intrinsic flexibility and optical attributes. We present a unique one-dimensional optical waveguiding crystal of dithieno[3,2-a:2′,3′-c]phenazine (1) with high aspect ratio displaying high mechanical flexibility and selective self-absorbance of the blue part of its fluorescence (FL). Though, macrocrystals exhibit elasticity, microcrystals deposited at a glass surface behave incredibly like plastic crystals due to significant surface adherence energy, making them suitable for constructing photonic circuits via micromechanical operation with atomic force microscopy cantilever tip. Phenomenally, the flexible crystalline waveguides display optical path-dependent FL signals at the output termini in both straight and bend configuration suitable for wavelength division multiplexing technologies. A futuristic reconfigurable directional coupler fabricated via micromanipulation by combining two arc-shaped crystals split the optical signal via evanescent coupling and deliver the signals at two output terminals with different split ratios. The presented mechanical micromanipulation technique could also be effectively extended to any flexible crystals to design and carve complex photonic circuits.
关键词： Organic Photonics,Flexible Crystals,Directional Coupler,Optical waveguides,Mechano-photonics
更新于2025-09-23 15:21:01
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Perovskite Photovoltaics on Roll-To-Roll Coated Ultra-thin Glass as Flexible High-Efficiency Indoor Power Generators
摘要： Indoor perovskite photovoltaics can help power the internet of things revolution, being highly ef?cient, low-cost, printable, and compatible with ?exible substrates. Castro-Hermosa et al. develop ?exible perovskite cells on roll-to-roll coated ultra-thin glass with excellent optoelectrical and mechanical properties, delivering ef?ciencies of 20.6%–22.6% under 200–400 lx LED illumination.
关键词： Flexible high-efficiency indoor power generators,Perovskite photovoltaics,LED illumination,Roll-to-roll coated ultra-thin glass
更新于2025-09-23 15:21:01
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Superhigh flexibility and out-of-plane piezoelectricity together with strong anharmonic phonon scattering induced extremely low lattice thermal conductivity in hexagonal buckled CdX (X= S, Se) monolayers
摘要： Although CdX (X= S, Se) has been mostly studied in the field of photocatalysis, photovoltaics, their intrinsic properties, such as, mechanical, piezoelectric, electron and phonon transport properties have been completely overlooked in buckled CdX monolayers. Ultra-low lattice thermal conductivity (1.08 W/mK (0.75 W/mK)) and high p-type Seebeck coefficient (1300 μV/K (850 μV/K)) in CdS (CdSe) monolayers have been found in this work based on first-principles DFT coupled to semi-classical Boltzmann transport equations, combining both the electronic and phononic transport. The dimensionless thermoelectric figure of merit (ZT) is calculated to be 0.78 (0.5) in CdS (CdSe) monolayers at room temperature, which is comparable to that of 2D tellurene (0.8), arsenene and antimonene (0.8), indicating its great potential for applications in 2D thermoelectrics. Such a low lattice thermal conductivity arise from the participation of both acoustic [91.98 % (89.22 %)] and optical modes [8.02 % (10.78 %)] together with low Debye temperature [254 K (187 K)], low group velocity [4 km/s (3 km/s)] in CdS (CdSe) monolayers, high anharmonicity and short phonon lifetime. Substantial cohesive energy (~ 4-5 eV), dynamical and mechanical stability of the monolayers substantiate the feasibility in synthesizing the single layers in experiments. The inversion symmetry broken along the ?? direction causes out-of-plane piezoelectricity. |d33| ~ 21.6 pm/V, calculated in CdS monolayer is found to be the highest amongst structures having atomic-layer thickness. Superlow Young’s modulus ~ 41 N/m (31 N/m) in CdS (CdSe) monolayers, which is comparable to that of planar CdS (29 N/m) and TcTe2 (34 N/m), is an indicator of its superhigh flexibility. Direct semiconducting band gap, high carrier mobility (~ 500 cm2V-1s-1) and superhigh flexibility in CdX monolayers signify its gigantic potential for applications in ultrathin, stretchable and flexible nanoelectronics. The all-round properties can be synergistically combined together in futuristic applications in nano-piezotronics as well.
关键词： thermoelectrics,flexible nanoelectronics,phonon transport,CdX monolayers,piezoelectricity
更新于2025-09-23 15:21:01
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Flexible Organic Solar Cells Over 15% Efficiency with Polyimide-Integrated Graphene Electrodes
摘要： A highly flexible and durable transparent graphene electrode with thermal stability was developed via the direct integration of polyimide (PI) on graphene. Due to the high transparency of PI-integrated graphene electrode and intimate contact between graphene and PI substrate, high-efficiency flexible organic solar cell with a PCE of 15.2% and outstanding mechanical robustness was obtained.
关键词： Thermal Stability,High Efficiency,Polyimide-Integrated Graphene Electrodes,Flexible Organic Solar Cells,Mechanical Robustness
更新于2025-09-23 15:21:01