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- 实验方案
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Segregation-free bromine-doped perovskite solar cells for IoT applications
摘要： Perovskite solar cells have attracted much attention as next-generation solar cells because of their high e?ciency and low fabrication costs. Moreover, perovskite solar cells are a promising candidate for indoor energy harvesting. We investigated the e?ect of bandgap tuning on the characteristics of triple cation-based perovskite solar cells under ?uorescent lamp illumination. According to the current density–voltage curves, perovskite solar cells with a wider bandgap than the conventional one exhibited improved open-circuit voltage without sacri?cing short-circuit current density under ?uorescent lamp illumination. Moreover, the wider bandgap perovskite ?lms including a large amount of bromine in the composition did not show phase segregation, which can degrade the photovoltaic performance of perovskite solar cells, after ?uorescent lamp illumination. Our results demonstrate the facile strategy to improve the performance of perovskite solar cells under ambient lighting and great potential of perovskite solar cells for indoor applications such as power sources for the internet of things.
关键词： indoor energy harvesting,perovskite solar cells,IoT applications,bromine-doped,bandgap tuning
更新于2025-09-16 10:30:52
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[IEEE 2019 Compound Semiconductor Week (CSW) - Nara, Japan (2019.5.19-2019.5.23)] 2019 Compound Semiconductor Week (CSW) - Improvement of External Quantum Efficiency of C <sub/>60</sub> /ZnPc Organic Photovoltaic Cells by Polymerization between C <sub/>60</sub> molecules
摘要： We have found that the external quantum efficiency of C60/ZnPc hetero-junction organic photovoltaics are improved by photo-induced polymerization between C60 molecules.
关键词： Fullerene,Organic Solar Cell,Energy Harvesting,Polymerization
更新于2025-09-16 10:30:52
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[IEEE 2019 34th Symposium on Microelectronics Technology and Devices (SBMicro) - Sao Paulo, Brazil (2019.8.26-2019.8.30)] 2019 34th Symposium on Microelectronics Technology and Devices (SBMicro) - MOS solar cells for indoor LED energy harvesting: influence of the grating geometry and the thickness of the gate dielectrics
摘要： This paper discusses the metal-oxide-semiconductor (MOS) solar cells for energy harvesting from indoor illumination using Al/SiO2/Si-p structures. Wafers of the Si-p (100) with a resistivity of 10 Ω.cm were used. The gate dielectric was grown by rapid thermal processing (RTP) with thicknesses of 1.65, 1.73, 2.10 and 2.23 nm. The main parameters studied were extracted using electrical characterization through IxV curves of the MOS solar cells with total areas of 3.24 cm2. At first, it was observed an increase of the dark current density from 0.49 to 4.4 μA/cm2 for the thickness varying from 1.65 to 2.23 nm. It is worthy of note the increase of the generated power from 8.1 to 46.7 μW/cm2 with the rise of the thickness in the range of 1.65 to 2.23 nm for a constant incident power of 5 mW/cm2. In this case, the lower the thickness, the higher the tunneling current through the gate dielectrics, which causes the decrease of the depletion region length and this decrease, in turn, makes the generation current density lower in the depletion region. Also, the reduction of the short-circuit current (JSC) due to the increase of the widths (W) and spacings (S) of the fishbone-grating geometry was well-correlated with the decrease of the perimeter (Pe) and the rise of the aspect ratio W/S.
关键词： MOS Solar Cell,Short-circuit current,Energy Harvesting,open-circuit voltage,LED
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Geometric Improvements on Solar Cells for Reducing Reflections
摘要： We present horn-shaped cavities in order to improve the efficiency of energy harvesting in solar cells with traditional materials. Nano-cavities, which are already used for this purpose in the literature, are generally based on the principles of ray optics, while their sizes are in fact comparable to wavelength. Inspired by their effectiveness at radio and microwave frequencies, we design horn-shaped cavities that can effectively trap light and reduce reflections. Based on electromagnetic responses of initial structures, horn geometries are further optimized to minimize reflections and improve absorption efficiency. Numerical results demonstrate excellent performances of the designed cavities, which may even eliminate need for matching layers.
关键词： reflections,solar cells,absorption efficiency,energy harvesting,horn-shaped cavities
更新于2025-09-16 10:30:52
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Hot-electron dynamics in quantum dots manipulated by spin-exchange Auger interactions
摘要： The ability to effectively manipulate non-equilibrium ‘hot’ carriers could enable novel schemes for highly efficient energy harvesting and interconversion. In the case of semiconductor materials, realization of such hot-carrier schemes is complicated by extremely fast intraband cooling (picosecond to subpicosecond time scales) due to processes such as phonon emission. Here we show that using magnetically doped colloidal semiconductor quantum dots we can achieve extremely fast rates of spin-exchange processes that allow for ‘uphill’ energy transfer with an energy-gain rate that greatly exceeds the intraband cooling rate. This represents a dramatic departure from the usual situation where energy-dissipation via phonon emission outpaces energy gains due to standard Auger-type energy transfer at least by a factor of three. A highly favourable energy gain/loss rate ratio realized in magnetically doped quantum dots can enable effective schemes for capturing kinetic energy of hot, unrelaxed carriers via processes such as spin-exchange-mediated carrier multiplication and upconversion, hot-carrier extraction and electron photoemission.
关键词： quantum dots,spin-exchange Auger interactions,semiconductor materials,hot-electron dynamics,energy harvesting
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE XVth International Conference on the Perspective Technologies and Methods in MEMS Design (MEMSTECH) - Polyana, Ukraine (2019.5.22-2019.5.26)] 2019 IEEE XVth International Conference on the Perspective Technologies and Methods in MEMS Design (MEMSTECH) - Efficiency Evaluation of Photovoltaic Power Converters for Ultra-Low Power Supply Systems
摘要： Power-over-Fiber (PoF) is a very promising technique and recent technology development makes it applicable. However the cost of PoF is high since high powered laser, photovoltaic power converters and special optical fibers are used. In this paper the detailed efficiency evaluation of optical power supply system based on standard, low cost telecom components are given. Different semiconductor materials were characterized to build the most efficient supply system. The highest conversion efficiency of photodiode equal to 26.2% and the efficiency of whole system equal to 13% is achieved.
关键词： optical power supply,power-over-fiber,energy harvesting
更新于2025-09-16 10:30:52
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Numerical Analysis of Single Negative Broadband Metamaterial Absorber Based on Tri Thin Layer Material in Visible Spectrum for Solar Cell Energy Harvesting
摘要： A broadband nanostructure metamaterial absorber (MA) based on tri-layer metallic-optical-thin film molded shape is proposed for visible spectrum solar energy scavenging. This MA is investigated for photon mobility to achieve significant photon conversion and absorption to integrate into solar cell technology, IoT components, or energy harvesting. Design and analysis of the proposed MA were performed using the “Yee’s Finite-Difference Time-Domain (FDTD)” method based on commercially available CST microwave studio simulation software. Numerical computational tools depict an absorptivity of higher than 80%, which covered nearly the visible region 430~627 THz. This significant absorptivity can be maintained with both transverse electric and transverse magnetic polarizations. Furthermore, molded shape with two-dimensional split and nano-square window expedites the unit cell to exhibit single negative (SNG) metamaterial characteristics and photon conversion acceleration. Compared with related previously reported broadband absorbers, the proposed MA has promising application, in conventional solar cell efficiency improvement and emitter.
关键词： Absorption,Energy harvesting,Metamaterial,Photon mobility
更新于2025-09-16 10:30:52
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Luminescent solar concentrators based on melt-spun polymer optical fibers
摘要： Luminescent solar concentrators (LSCs) collect incoming sunlight and direct it to a smaller-area photovoltaic cell. In the presented work, form factor and illumination angle-dependent performance of LSCs consisting of bi-component melt-spun fibers is demonstrated. Three thermoplastic polymers act as dispersing host material for the luminescent dye Lumogen Red 305 (LR305). Molecular dynamics simulations provide numerical access to Hildebrand solubility parameters, which are an estimate for the mixing compatibility of dye with polymer matrix. Actual emission intensity measurements from material samples are compared to Monte Carlo ray tracing simulations. Some samples show an increased absorption, which led to the hypothesis that there exist optically passive dye aggregates if the dispersion is not optimal. The best-performing polymer/dye pair is identified and used to melt-spin fibers. Geometrically defined bundles of LSC fibers are studied in a scenario of white light illumination and variation of illumination-angle. This experiment simulates a theoretical daily course-of-sun illumination in absence of atmospheric effects. We report optical conversion efficiencies of the prepared LSCs between 2% and 15%, depending on illumination angle and bundle geometry.
关键词： Polymer optical fibers,Melt spinning,Energy harvesting,Luminescent solar concentrators
更新于2025-09-16 10:30:52
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High gain and wideband on-chip hybrid plasmonic V-shaped nano-antenna
摘要： In this paper, a wideband hybrid plasmonic V-shaped nano-antenna is proposed based on coupled hybrid plasmonic waveguide (CHPW) feeding to increase the surface plasmons propagation length. The CHPW specifications are investigated analytically and numerically to obtain the dispersion relation and propagation length by the genetic algorithm and finite element method, respectively. Moreover, the proposed V-shaped nano-antenna with the fractional bandwidth of ～86% and the maximum ef?ciency of 98% is able to receive/transmit optical signals at three telecommunication wavelengths of 850, 1310, and 1550 nm with the high realized gains of 10.5, 9.39, 9.05 dB, respectively. The shape of the radiation pattern, with a main lobe along the antenna axis, makes this antenna appropriate for point-to-point connections in inter- or intra-chip optical wireless links and networks, which is studied comprehensively in this paper. Furthermore, to obtain a high optical power signal and tune the antenna orientation, the performance of the antenna is investigated with two different types of array structure, single row and square and its applications for energy harvesting and beam steering are studied. The fabrication feasibility of the nano-antenna is realizable based on the complementary metal-oxide-semiconductor technology.
关键词： Energy harvesting,Optical nano-antenna,Wireless interconnection link,Coupled hybrid plasmonic waveguide
更新于2025-09-16 10:30:52
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Quantum Transmission Line Modelling and Experimental Investigation of the Output Characteristics of a Terahertz Quantum Cascade Laser
摘要： Magnetorheological (MR) fluid is a widely used smart material due to its outstanding properties. This paper presents the design, development, modeling, and prototype testing of a self-energizing and self-powered MR brake-by-wire system, whose aforementioned capabilities are enabled by brake energy harvesting. The system is composed mainly of a typical T-shaped drum-type MR brake and a wedge mechanism for self-energizing purpose. Into the system, we also install a generator that harvests regenerative energy during braking, thereby creating a self-power capability that cannot be found in common vehicular brake-by-wire systems. Brake torque analysis is conducted, and the braking process is simulated in a MATLAB/Simulink environment. Finite element analysis of the magnetic field, temperature field, and mechanical strength of critical components is carried out. The simulation results are used to optimize design parameters and material selection. Finally, prototypes and a corresponding test rig are established. The experimental results show that only about 30 W of power is required to generate a 315 N·m brake torque and that the regenerative power produced by the generator can be used for braking, thus fulfilling the self-power requirement. The investigation of different wedge angles indicates that considerable self-energizing occurs under a small wedge angle. The findings demonstrate that the brake actuator, which has a relatively small volume, can significantly enlarge brake torque while harvesting brake energy. This feature enables the promising application of MR fluids in automotive brake systems.
关键词： wedge mechanism,energy harvesting,magnetorheological (MR),Brake-by-wire system,self-powered capability
更新于2025-09-16 10:30:52