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Effect of doping mechanism on photogenerated carriers behavior in Cu-doped ZnSe/ZnS/L-Cys core-shell quantum dots
摘要： Cu-doped ZnSe/ZnS/L-Cys core–shell QDs are prepared by both nucleation doping and growth doping in an aqueous synthesis method. Transport of photogenerated free charge carriers (FCCs) in these Cu-doped QDs is probed via a combination of surface photovoltaic (SPV), photoacoustic (PA), and electric-field-induced SPV techniques, supplemented by the UV–VIS absorption spectrum and Raman spectrum. The results confirm that the two doping mechanisms result in different doping locations and microelectronic structures of the Cu-doped QDs. The distinctive microelectronic structure of the QDs prepared by nucleation doping, as compared with those prepared by growth doping, results in a number of favorable SPV characteristics. For example, the QDs prepared by nucleation doping exhibit a higher SPV response intensity at 600 nm because of a higher concentration of photogenerated FCCs. The ratio of the strongest SPV response and the strongest PA signal of the QDs prepared by nucleation doping is up to 2.41 times greater than those of the QDs prepared by growth doping. This is because the greater numbers of photogenerated FCCs in the QDs prepared by nucleation doping generate the PV effect rather than the PA effect that is caused by a nonradiative de-excitation process. The position of the shoulder peak of the SPV response at a long wavelength of the QDs prepared by nucleation doping is significantly red-shifted compared with that of the QDs prepared by growth doping, leading to a broader SPV response range in the visible region. The QDs prepared by nucleation doping have a more obvious donor feature than those prepared by growth doping.
关键词： photogenerated carriers,Cu-doped ZnSe/ZnS/L-Cys,quantum dots,photoacoustic,surface photovoltaic,nucleation doping,growth doping
更新于2025-09-11 14:15:04
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Structural modification as the pioneer strategy in competition of the porphyrin dye and perovskite solar cells: From dynamics to kinetics of the photovoltaic processes
摘要： Molecular engineering plays a key role in designing ef?cient dye-sensitized/perovskite solar cells (DSSCs/PSCs). Porphyrins have more favorable spectroscopic properties than AZn(COOH)3 perovskites due to their lower chemical hardness. Also, porphyrins are pioneering photosensitizers in exciton formation/dissociation, kinetically. The presence of Zn2t and butadiyne as the linker in the porphyrins and the existence of the electron donors of dimethylammonium and formamidinium in the perovskites improve their photovoltaic properties. Porphyrin dimers have a greater charge transfer distance in comparison to the monomers. However, they show less energy conversion ef?ciency, which may be related to the quenching of the interporphyrin charge transfer. As a consequence, DSSCs based on the porphyrin monomers have a higher ef?ciency than the studied PSCs.
关键词： perovskite solar cells,porphyrin dye,exciton formation/dissociation,molecular engineering,photovoltaic processes
更新于2025-09-11 14:15:04
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Dielectric, ferroelectric, and photovoltaic properties of La-doped Bi(Ni2/3Ta1/3)O3–PbTiO3 ceramics
摘要： Bi(Ni2/3Ta1/3)O3-PbTiO3 ceramics doped with different La contents were prepared using the conventional solid-state reaction route. The electric properties of La-doped Bi(Ni2/3Ta1/3)O3-PbTiO3 ceramics were compared with those of non-La ceramics. As the incorporated La content increased, the Curie temperature TC decreased linearly, whereas the dielectric constant ε'RT at room temperature increased. Although the remnant polarization Pr decreased, the bipolar strain S (%) increased as the La content increased, owing to phase transition from the ferroelectric phase to the paraelectric phase. The maximum bipolar strain S (0.42%) was observed in the Bi0.7La0.3(Ni2/3Ta1/3)O3-PbTiO3 ceramics. When the La content reached 50%, the ferroelectric performance deteriorated. After La was doped into the Bi(Ni2/3Ta1/3)O3-PbTiO3 ceramics, the photovoltages were markedly improved. The photovoltage (27 V) reached its maximum with 15% La content but was reduced to 0 V with 50% La doping content owing to a decline in ferroelectricity. The speed of the photovoltaic response to the incident light for this system was about 0.5 ms. Therefore, the strain and the photovoltaic properties of the La-doped Bi(Ni2/3Ta1/3)O3-PbTiO3 ceramics were markedly improved relative to those of undoped ceramics.
关键词： Ceramics,Ferroelectric,Dielectric,Photovoltaic
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Photovoltaic system simulation model for steady-state microgrid energy management application
摘要： The high penetration of Distributed Energy Resources (DERs) creates the necessity of having mathematic models that can accurately represent the variable and intermittent nature of its resources, which are normally based on renewable energy such as photovoltaic systems. Since the DERs are located near the consumer, at the distribution side of the network, it creates a challenge in the operation and control of the distribution system. This challenge can be addressed by microgrids, which are the new paradigm for defining the operation of the distribution system with high penetration of DERs. This paper presents a photovoltaic simulation model which can analyze the photovoltaic system response to particular weather condition. The model can be applied in a steady-state microgrid energy management system. The model was simulated, and the results were analyzed. Different cases were applied, and the results were high satisfactory in comparison with the ones presented in the literature.
关键词： steady state,energy management,Photovoltaic system,mathematic model,microgrid
更新于2025-09-11 14:15:04
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[IEEE 2019 International Conference on Advances in Big Data, Computing and Data Communication Systems (icABCD) - Winterton, South Africa (2019.8.5-2019.8.6)] 2019 International Conference on Advances in Big Data, Computing and Data Communication Systems (icABCD) - Failure Analysis of Photovoltaic Equipment Based on ISOMPNN
摘要： ISOMPNN, a new incremental learning method based on the self-organizing map (SOM) and probabilistic neural network (PNN) is proposed to tackle the problem of model self-adaptation when new categories of equipment failures occur. It uses a modular SOM to learn each category of photovoltaic device data and then constructs a PNN using the prototype vector of each category of data after training as a model neuron of that category. Incremental SOMPNN can incrementally learn new classes of different data to complement existing models. In the incremental learning process, only the new data is used to adjust the model, instead of reusing the original data, reducing training time and reducing storage space. Its effectiveness can be well verified in known photovoltaic device data.
关键词： self-organization map,photovoltaic equipment,probabilistic neural network,incremental learning
更新于2025-09-11 14:15:04
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Highly Efficient Indoor Organic Solar Cells by Voltage Losses Minimization through Fine-tuning of Polymer Structures
摘要： Herein we report a detailed study on the optoelectronic properties, photovoltaic performance, structural conformation, morphology variation, charge carrier mobility and recombination dynamics in bulk heterojunction (BHJ) solar cells comprising of a series of donor-acceptor (D-A) conjugated polymers as electron donors based on benzodithiophene (BDT) and 5,8-bis(5-bromothiophen-2-yl)-6,7-difluoro-2,3-bis(3-(octyloxy)phenyl)quinoxaline as a function of the BDT’s thienyl substitution (alkyl (WF3), alkylthio (WF3S) and fluoro (WF3F)). It is manifested the synergistic positive effects of the fluorine substituents on the minimization of the bimolecular recombination losses, the reduction of the series resistances (RS), the increment of the shunt resistances (RSh), the suppression of the trap-assisted recombination losses, the balanced charge transport, the finer nanoscale morphology and the deeper highest occupied molecular orbital (EHOMO) versus the alkyl- and alkylthio- substituents. According to these findings, WF3F:[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) based-organic photovoltaic (OPV) device is a scarce example that feature a high power conversion efficiency (PCE) of 17.34% under 500 lx indoor LED light with a high open-circuit voltage (VOC) of 0.69 V, due to the suppression of the voltage losses and a PCE of 9.44% at 1-sun (100 mW/cm2) conditions, simultaneously.
关键词： Series and Shunt resistances,Coherence length,Conjugated polymers,Wide-angle X-ray scattering,Organic photovoltaic devices,Recombination losses,Indoor lighting conditions
更新于2025-09-11 14:15:04
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Maximum Power Point Tracking of Photovoltaic System Based on Reinforcement Learning
摘要： The maximum power point tracking (MPPT) technique is often used in photovoltaic (PV) systems to extract the maximum power in various environmental conditions. The perturbation and observation (P&O) method is one of the most well-known MPPT methods; however, it may face problems of large oscillations around maximum power point (MPP) or low-tracking efficiency. In this paper, two reinforcement learning-based maximum power point tracking (RL MPPT) methods are proposed by the use of the Q-learning algorithm. One constructs the Q-table and the other adopts the Q-network. These two proposed methods do not require the information of an actual PV module in advance and can track the MPP through offline training in two phases, the learning phase and the tracking phase. From the experimental results, both the reinforcement learning-based Q-table maximum power point tracking (RL-QT MPPT) and the reinforcement learning-based Q-network maximum power point tracking (RL-QN MPPT) methods have smaller ripples and faster tracking speeds when compared with the P&O method. In addition, for these two proposed methods, the RL-QT MPPT method performs with smaller oscillation and the RL-QN MPPT method achieves higher average power.
关键词： photovoltaic (PV) system,Q-learning,reinforcement learning,maximum power point tracking (MPPT),Q-network
更新于2025-09-11 14:15:04
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Performance Investigation of Mott-Insulator LaVO3 as a Photovoltaic Absorber Material
摘要： Mott insulators have recently been identi?ed as potential solar energy conversion material due to their favorable parameters. In this paper, we have investigated the cell performance by exploring the photovoltaic properties of Mott Insulator LaVO3 (LVO). The LVO thin ?lms were grown by the sol–gel technique followed by a sintering pathway under various processing conditions. We investigated the in?uence of processing parameters on the structural, optical and electrical properties of the ?lms through different characterization techniques. A correlation between the material parameters with the device performance has been established to ensure LVO perovskite for photovoltaic applications. This analysis will aid researchers to realize Mott insulators as light absorber material.
关键词： photovoltaic material,Mott insulator,Thin ?lm solar cell,oxide perovskites
更新于2025-09-11 14:15:04
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Extraction of Uncertain Parameters of Double-Diode Model of a Photovoltaic Panel Using Simulated Annealing Optimization
摘要： In this article, our goal is to improve the estimation of the parameters of solar photovoltaic models by using the simulated annealing (SA) algorithm. The proposed approach takes into account the uncertainties of measurements. This approach consists of three steps. The ?rst is the extraction of the parameters in a conventional manner based on SA. Then, in order to reduce the search interval of parameters, we will determine the uncertainties of the measurements of each parameter. Finally, we will determine the instantaneous parameters, taking into account the results of the ?rst two steps. For the validation of proposed theoretical developments, the proposed approach is applied to two di?erent commercial solar panel parameter estimation problems (the monocrystalline solar module STM6-40/36 and the polycrystalline silicon cells photovoltaic module Sharp ND-R250A5). The results obtained are compared with well-established algorithms to con?rm its e?ectiveness. These comparisons have shown that the proposed method exhibits largely more e?ective performances than existing methods in the literature.
关键词： uncertainties,polycrystalline silicon cells,solar photovoltaic models,simulated annealing,monocrystalline solar module,parameter estimation
更新于2025-09-11 14:15:04
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Cryogenic delamination: mathematical modeling and analysis of an innovative recycling process for photovoltaic crystalline modules
摘要： The increasing rate of production and diffusion of photovoltaic (PV) technologies for industrial and domestic applications urges improvement of the sustainability of their demanufacturing processes in order to reduce the amount of electronic wastes. Sustainability of demanufacturing processes concerns the reduction of energy consumption, the reduction of polluting substances as well as the reduction of the effort spent in recovery of the components. No optimal process exists so far, provided a number of different approaches have been devised. A promising choice relies on the use of thermo-mechanical treatments for inducing a delamination process where interfacial bonding between layers are weakened and, finally, broken inducing delamination of the layers. In this view, the paper presents a preliminary theoretical industrialization study. We introduce a mathematical model based of the equations of thermo-elasticity to prove the feasibility of the technological process; the results of a Finite Element (FE) Analysis are then discussed to show the validity of the new sustainable demanufacturing process endeavouring the delamination process. The analysis is performed searching the optimal thermally induced cycles at cryogenic temperatures.
关键词： Thermoelasticity,Sustainability,Photovoltaic modules
更新于2025-09-11 14:15:04