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High throughput MOVPE and accelerated growth rate of GaAs for PV application
摘要： We present the feasibility of metalorganic vapor phase epitaxy (MOVPE) with extremely high-speed growth of GaAs for solar cell applications. The growth rate was increased up to 120 μm/h, and exhibited an almost linear relationship with the amount of supplied trimethylgallium (TMGa). The thickness variation and doped carrier concentration of GaAs grown at 90 μm/h were comparable to those of conventionally grown GaAs at a lower growth rate. The potential for reducing the V/III supply ratio was investigated to reduce the material cost. Non-doped GaAs wafers were grown at the accelerated growth rate of 90 μm/h, with various V/III ratios. The growth rate of GaAs increased by 20% when the V/III ratio was decreased from 40 to 5. In low temperature photo-luminescence (PL) measurement, significant change in PL spectra was not observed, indicating that there was no significant change in quality. The light-power conversion efficiency was almost comparable for V/III ratios from 10 to 40 whereas that at the lowest V/III ratio of 5 was degraded. Photovoltaic (PV) solar cells of GaAs were fabricated with various growth condition. It is found that the performance of the cells grown at 90 μm/h were comparable with previous results.
关键词： A3. Metalorganic vapor phase epitaxy,B2. Semiconducting GaAs,B3. Solar cells,A1. Crystal morphology
更新于2025-09-23 15:23:52
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Voltage-Induced Charge Redistribution in Cu(In,Ga)Se <sub/>2</sub> Devices Studied With High-Speed Capacitance–Voltage Profiling
摘要： Devices made from Cu(In,Ga)Se2 (CIGS) solar cell material have been evaluated with high-speed capacitance–voltage pro?ling after stepwise voltage changes. The changes primarily affect near-interface charge at deep acceptors within the CIGS absorber layer and generate temperature-dependent capacitance changes observed in deep-level transient spectroscopy measurements. SCAPS device modeling indicates that the deep acceptor concentration is up to the two orders of magnitude higher than the shallow doping level. High deep acceptor concentrations are found in all materials studied here. The large deep defect levels are high enough to limit minority carrier lifetime and cell ef?ciency.
关键词： CuInx Ga1 ?x Se2 (CIGS),capacitance methods,solar cells
更新于2025-09-23 15:23:52
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On the homogeneity of the external quantum efficiency in a free OPV roll-to-roll flexible solar module
摘要： We present a microscopic characterization of an organic photovoltaic (OPV) module demonstrator, fabricated within the “freeOPV” project. The local properties of the module are discussed on di?erent length scales, from the submicrometric to the centimeters one, inferring the module structure and the origin of the di?erent contributions to the optical and photoelectrical spatial inhomogeneity. We show that the local external quantum e?ciency (EQE) in the individual cells of the module exhibits typical variations within 6–8% of the peak value over about 0.4 mm2. Larger variations are observed when comparing di?erent cells across the module surface, with di?erences in the EQE peak values up to 1.6 times. Our results suggest that the roll-to-roll OPV module performance can be further improved by optimizing the printing uniformity as well as the charge extraction e?ciency of electrodes.
关键词： Confocal spectroscopy,Organic solar cells
更新于2025-09-23 15:23:52
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Design and Implementation of Digital Phase Locked Loop for Single-Phase Grid-Tied PV Inverters
摘要： The rational design of porphyrin sensitizers is always crucial for dye-sensitized solar cells (DSSCs), since the change of only a single atom can have a significant influence on the photovoltaic performance. We incorporated the pyridothiadiazole group, as a stronger electron-withdrawing group, into the commonly well-established skeleton of D-porphyrin-triple bond-acceptor sensitizers by a single atom change for a well-known strong electron-withdrawing benzothiadiazole (BTD) unit as an auxiliary acceptor. The impact of the pyridothiadiazole group on the optical; electrochemical; and photovoltaic properties of D–π–A porphyrin sensitizers was investigated with comparison for a benzothiadiazole-substituted SGT-020 porphyrin. The pyridothiadiazole-substituted SGT-024 porphyrin dye was red-shifted so that the absorption range might be expected to achieve higher light harvest efficiency (LHE) than the SGT-020 porphyrin. However, all the devices were fabricated by utilizing SGT-020 and SGT-024, evaluated and found to achieve a cell efficiency of 10.3% for SGT-020-based DSSC but 4.2% for SGT-024-based DSSC under standard global AM 1.5G solar light conditions. The main reason is the lower charge collection efficiency of SGT-024-based DSSC than SGT-020-based DSSC, which can be attributed to the tilted dye adsorption mode on the TiO2 photoanode. This may allow for faster charge recombination, which eventually leads to lower Jsc, Voc and power conversion efficiency (PCE).
关键词： D–π–A structural porphyrin,charge collection efficiency,acceptor units,charge recombination,dye-sensitized solar cells
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 5th International Conference on Methods and Systems of Navigation and Motion Control (MSNMC) - Kiev, Ukraine (2018.10.16-2018.10.18)] 2018 IEEE 5th International Conference on Methods and Systems of Navigation and Motion Control (MSNMC) - Analysis of Solar Rechargeable Airplane
摘要： In this paper, main goal focused on analysis for solar rechargeable airplane. This analysis has in configuration flow parameters that represent time and location of the starting point, solar cells performance and surface area, energy storage characteristics with initial state and power distribution for on-board systems. Simulation provides full continuous flight day performance for available power acquired from the Sun during the flight time, required power that unmanned aerial vehicle actually use and on-board battery bank’s state of charge.
关键词： solar cells,unmanned aerial vehicle,solar rechargeable airplane,Simulink,Design analysis,solar power
更新于2025-09-23 15:22:29
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Effects of selenisation temperature on photoluminescence and photoluminescence excitation spectra of ZnO/CdS/Cu2ZnSnSe4/Mo/glass
摘要： The effect of solar cell processing (including etching in KCN along with deposition of CdS and ZnO) on photoluminescence (PL) spectra and bandgap Eg (measured at 4.2 K by photoluminescence excitation) of Cu2ZnSnSe4 films, produced by selenising metallic precursors at 450°C, 500°C and 550°C, was studied. Temperature and excitation intensity analysis of the P1 dominant band in the PL spectra of solar cells suggests that after processing this band still can be assigned to the free-to-bound recombination of free electrons with holes bound at deep acceptor levels influenced by valence band-tails. However processing increased the intensity of P1 and blue shifted it. The strongest effect was observed for the film selenised at 500°C. For the film selenised at 450°C the blue shift and increase in the intensity were smaller and only a slight intensity rise was found for the film selenised at 550°C. The intensity increase we assign to a reduction in the concentration of non-radiative recombination centers on the surface because of the etching and changes in doping due to inter-diffusion of Cd, S, Se and Zn after the deposition of CdS. Such an inter-diffusion depends on the elemental composition of the films defining the chemistry of defects and influencing Eg which increased in the film selenised at 500°C but decreased in the other films. Processing increased the P1 shift rate (j-shift) with excitation power change in all the films demonstrating a higher compensation degree in the solar cells which is consistent with the formation of an interface layer containing new donors CdCu.
关键词： Optical spectroscopy,Copper zinc tin selenide,Photoluminescence,Solar cells,Selenisation
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 6th Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE) - Vilnius, Lithuania (2018.11.8-2018.11.10)] 2018 IEEE 6th Workshop on Advances in Information, Electronic and Electrical Engineering (AIEEE) - Usage of Signals with a High PAPR Level for Efficient Wireless Power Transfer
摘要： The paper discusses the impact of high-power laser diodes on the conversion efficiency of solar cells in optoelectronics, focusing on the use of specific materials and experimental setups to enhance performance.
关键词： laser diodes,conversion efficiency,materials,optoelectronics,solar cells
更新于2025-09-23 15:22:29
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Effect of electron-donating groups on the electrochemical and optical properties of indoline substituents as hole transport materials: A computational study
摘要： The e?ect of electron-donating property of the groups attached to the indoline substituents with two di?erent low-cost cores (tetraazafulvalene and pyrene) as new hole transport materials (HTMs) was studied on their electrochemical and optical behaviors. The calculations were carried out based on the theoretical approaches including density functional theory (DFT), time-dependent density functional theory (TD-DFT), and Marcus theory. Some important parameters, such as hole mobility, solubility and stability, absorption and emission spectra, Stokes shift, and HOMO/LUMO energies and distributions were obtained and discussed. It was found that the HOMO of all the designed structures is distributed more widely than their LUMO. The results showed that the maximum absorption band of the designed HTMs is red shifted as the electron-donating ability increases. It is also predicted that TAF/indoline-OMe and Py/indoline-NH2 with the hole mobility of 2.90 × 10?3 and 1.51 × 10?3 cm2 V?1 s?1, respectively give higher ?ll factor and short-circuit current density of the device.
关键词： Hole transporting materials,Perovskite solar cells,Di?erent electron-donating groups,Indoline substituents,DFT/TD-DFT,Cost e?ective
更新于2025-09-23 15:22:29
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Low-cost light manipulation coatings for polymer solar cell photocurrent increase under various incident angles
摘要： We fabricate self-assembled templates to produce textured polydimethylsiloxane (PDMS) with quasi-random dimension distributions which are employed as light manipulation coatings in polymer solar cells (PSCs). When deposited at the PSC glass/air interface, PDMS films with microdome-like structures enhance the short-circuit current density (Jsc) by 7.9% through combined anti-reflective and scattering effects. The PSC power conversion efficiency can thus be improved from 6.75% to 7.28% and a maximum Jsc increase of 21% is observed for incident light tilted by 30 degrees. We compare structures with different diameter dispersities and confirm that quasi-randomness in textured coatings can increase their light scattering ability.
关键词： Nanofabrication,self-assembly,light manipulation,polymer solar cells
更新于2025-09-23 15:22:29
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[IEEE 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Tangier (2017.12.4-2017.12.7)] 2017 International Renewable and Sustainable Energy Conference (IRSEC) - Thermomechanical Investigation of PV Panels Behaviour under NOCT Conditions
摘要： Numerous works on the enhancement of photovoltaic cells’ efficiency can been found in the literature. However, studies related to its durability are limited. For instance, solar radiation induced internal thermal stresses on the structure of photovoltaic (PV) panels has received little attention. These effects cannot be ignored when analyzing the panel’s durability. The internal stresses are difficult to measure since a PV panel is a complex structure composed by different layers, which causes a non-uniform distribution of the temperature inside the panel. In this work, fully coupled thermo-mechanical finite element simulations were performed with the commercial code ABAQUS/CAE to estimate these stresses. Temperature variations and local stress states are estimated throughout the PV panel thickness under nominal operating conditions.
关键词： thermo-mechanical stresses,FE simulation,silicon solar cells,PV panels
更新于2025-09-23 15:22:29