- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Advanced partial nucleation for single-phase FA0.92MA0.08PbI3-based high-efficiency perovskite solar cells; 部分预成核以制备单相基于FA0.92MA0.08PbI3的高 效太阳电池;
摘要： To date, extensive research has been carried out, with considerable success, on the development of high-performance perovskite solar cells (PSCs). Owing to its wide absorption range and remarkable thermal stability, the mixed-cation perovskite FAxMA1?xPbI3 (formamidinium/methylammonium lead iodide) promises high performance. However, the ratio of the mixed cations in the perovskite film has proved difficult to control with precursor solution. In addition, the FAxMA1?xPbI3 films contain a high percentage of MA+ and suffer from serious phase separation and high trap states, resulting in inferior photovoltaic performance. In this study, to suppress phase separation, a post-processing method was developed to partially nucleate before annealing, by treating the as-prepared intermediate phase FAI-PbI2-DMSO (DMSO: dimethylsulfoxide) with mixed FAI/MAI solution. It was found that in the final perovskite, FA0.92MA0.08PbI3, defects were substantially reduced because the analogous molecular structure initiated ion exchange in the post-processed thin perovskite films, which advanced partial nucleation. As a result, the increased light harvesting and reduced trap states contributed to the enhancement of open-circuit voltage and short-circuit current. The PSCs produced by the post-processing method presented reliable reproducibility, with a maximum power conversion efficiency of 20.80% and a degradation of ~30% for 80 days in standard atmospheric conditions.
关键词： partial-nucleation,defects,perovskite solar cell (PSC),stability,mixed cations,single phase
更新于2025-09-11 14:15:04
-
[IEEE 2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC) - Berlin, Germany (2019.7.23-2019.7.27)] 2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - An Improved Liquid Metal Mask Printing enabled Fast Fabrication of Wearable Electronics on Fabrics <sup>*</sup>
摘要： The rare earth con?guration entropy dependence of the crystal structure, microstructure and magnetic properties for SmCo5 based intermetallic compounds has been systematically investigated by using power X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy and magnetic measurement. The studies show that the single phase with CaCu5 type structure forms in (Sm1/2Nd1/2)Co5, (Sm1/3Nd1/3Y1/3)Co5 and (Sm1/4Nd1/4Y1/4Tb1/4)Co5. The formation of single phase is derived from Miedema's model due to the mixing enthalpy of 0 kJ$mol(cid:1)1 at rare earth site. The high entropy (Sm1/4Nd1/4Y1/4Tb1/4)Co5 intermetallic compound is obtained due to its con?guration entropy of 1.39R and rare earth equiatomic ratio at Sm site. The morphologic images show that the grains are growing and agglomerating with doping equiatomic rare earth Y and Tb. The magnetization of sample cannot reach saturation within the maximum ?eld of 30 kOe at room temperature, the magnetizing curve follows the Langevin model for SmCo5 and (Sm1/2Nd1/2)Co5, and the modi?ed Langevin model for (Sm1/3Nd1/3Y1/3)Co5 and (Sm1/4Nd1/4Y1/4Tb1/4)Co5, respectively. The ?tted magnetization is going down with substitution of nonmagnetic Y and heavy rare earth Tb due to the diluting magnetic effect of nonmagnetic Y substitution for Sm and the weakened effects on moment of Tb moment arrangement antiparallel to that of Co. The coercivity tends to decrease due to the agglomeration and growth of grains. It implies that the con?guration entropy seems to have little effect on the room temperature magnetizing process.
关键词： High entropy,Single phase,SmCo5 intermetallic compound,Magnetic property
更新于2025-09-11 14:15:04
-
[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Common Mode Voltage Reduction of Single-Phase Quasi-Z-Source Inverter Based Photovoltaic System
摘要： A common mode voltage (CMV) reduction method is proposed for the active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) based photovoltaic (PV) power system. The APF integrated qZSI completely compensates the dc-side double-line-frequency (2ω) ripple through the APF capacitor, while maintaining low qZS inductance and capacitance. The proposed method reduces the CMV amplitude to half of that using the traditional sinusoidal pulsewidth modulation (SPWM). The switching and conduction power losses are analyzed. Simulation and analysis demonstrate the proposed method reduces CMV without loss of performance and efficiency of the APF integrated single-phase qZSI.
关键词： quasi-Z-source inverter,Common mode voltage,pulsewidth modulation,single-phase inverter
更新于2025-09-11 14:15:04
-
A Multifunctional Single Phase Grid Integrated Residential Solar PV Systems based on LQR Control
摘要： This paper presents a multifunctional single-stage residential photovoltaic power supply based on Linear Quadratic Regulator. The system makes use of a single phase power converter connected to the grid through an LCL filter. A robust LQRI controller is designed to incorporate added functions such as power line conditioner, active power regulator, and voltage stabilizer. The perturb and observe (P&O) algorithm is used to generate the reference signal for the fluctuating DC bus voltage as well as to extract the maximum power from the solar panels. Full modeling of the converter in the D-Q reference frame is presented. A Linear Quadratic Regulator with added Integral action (LQRI) is designed to achieve optimal multi-functionality operation of the residential power supply. Simulation and experimental results confirm the expected performance of the proposed controller for insolation and load variations.
关键词： Maximum power point tracking (MPPT),D-Q model,LCL filter,Perturb and observe (P&O),LQRI controller,single phase,Solar PV system
更新于2025-09-10 09:29:36
-
Comparative study of photoluminescence of single and mixed phase ZrTiO4 prepared by solution combustion and polymeric precursor method
摘要： This work aims to study synthesis methods and photoluminescence properties of ZrTiO4. Wet chemical routes used for synthesis are solution combustion method and polymeric precursor method. Urea and glycine are two different fuels used in solution combustion synthesis. Scanning Electron Microscope studies con?rms that morphology of the nanoparticles depends on synthesis method. Photoluminescent property depends on the phase of the material, rather than the method of synthesis. Characterization such as X-ray diffraction, SEM, Re?ectance and Photoluminescence studies prove the role of synthesis methods on the properties of the ZrTiO4. Both upconversion and down conversion luminescence have been achieved by synthesizing ZrTiO4 from solution combustion method using urea as fuel, where ZrTiO4 exists in mixed phase.
关键词： Polymeric precursor method, (PPM),Photoluminescence,Single phase,Mixed phase,ZrTiO4,Solution combustion method, (SCS)
更新于2025-09-09 09:28:46
-
Dy <sup>3+</sup> -doped Y <sub/>3</sub> Al <sub/>5</sub> O <sub/>12</sub> transparent ceramic for high efficiency ultraviolet excited single-phase white-emitting phosphor
摘要： A kind of Dy-doped yttrium aluminum garnet (YAG) transparent ceramic for ultraviolet excited single-phase white light emitting phosphor was investigated, which has high quantum efficiency (45%). The temperature field of Dy:YAG transparent ceramic was calculated by steady state thermal simulation. Moreover, by combining with 365 nm LED chip directly, the CIE coordinate (x=0.33, y=0.35) is close to the standard equal energy white light illumination. The Dy:YAG transparent ceramic, possessing of good optical and thermal properties, is promising for applications in high-power LEDs devices.
关键词： single-phase white-emitting phosphor,Dy-doped YAG,high-power LEDs,transparent ceramic
更新于2025-09-09 09:28:46
-
[IEEE 2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC) - Mysore, India (2017.9.8-2017.9.9)] 2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC) - Mitigation of Lower Order Harmonics in a Grid-Connected Single-Phase PV Inverter using Shunt Active Filter
摘要： In this paper, a novel technique is proposed for mitigating lower order harmonics for single phase PV inverter using harmonic compensation. Step up transformer is used boost the voltage as per requirement of the grid. However, the implemented system will not introduce any lower order harmonics in the grid, but there are little chances of lower order harmonics, because of the dead time of inverter, core saturation and magnetizing current of the transformer, etc. In this paper, a unique approach is being presented which mitigates lower order harmonics using inverter current control. In this paper, adaptive harmonic compensation technique with additional active filter is being presented before feeding a supply to the grid. To obtain better control proportional resonant integral (PRI) controller is integrated. The advantage of using PRI controller is; it eliminates DC component from the control loop. In this paper, a PRI controller and LMS adaptive harmonic filter are also been discussed in great detail. In this paper, two systems are considered and compared one with an adaptive harmonic filter using SPWM, and in the second system, active filter is added before feeding inverter output to the step up transformer. Hence the first system is explained in great detail and for second system illustration of the active filter and obtained results are compared.
关键词： LMS adaptive filter,single phase PV inverter,harmonic distortion,PRI controller
更新于2025-09-09 09:28:46
-
[IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Cooperative Control and Power Management for Islanded Residential Microgrids with Local Phase-wise Generation and Storage Units
摘要： A cooperative control and management strategy for islanded residential microgrids is presented in this paper. In addition to the loads, PV generation and battery storage are considered within each phase using droop control schemes. The proposed strategy uses a two-tiered management scheme to coordinate intra- and inter-phase power management. Each intra-phase control relies on a modi?ed vector control with a multi-segment (P/f) droop strategy to balance the generation, load and potential power transfer among other two phases. The inter-phase management only comes into play when there is an imbalance among phases so that desirable power can be transferred to the phases with de?ciencies. This is accomplished by back-to-back converters connecting the phases. PSCAD/EMTDC has been used to investigate the performance of the proposed strategy. It is interesting to observe that when extra power is needed in one particular phase, the desired amount is transferred through the back-to-back converters from other phases. As a result, the balance for voltage, frequency, and power can be achieved at both the phase level and the system level.
关键词： single-phase systems,Residential microgrids,back-to-back converters,power electronics,power management
更新于2025-09-04 15:30:14