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Applying neoteric MgTiO3-coated TiO2 nanoparticulate films as scaffold layers in perovskite solar cells based on carbon counter electrode for retarding charge recombination
摘要： MgTiO3-coated TiO2 mesoporous scaffold layers were fabricated and applied in perovskite solar cells (PSCs) based on carbon counter electrode (CCE), in which TiO2 mesoporous layers were treated with different concentration of Mg2+ solution. Compared with PSCs based on pure TiO2 mesoporous layer, the open circuit voltage (Voc) and circuit photocurrent density (Jsc) of MgTiO3/TiO2-based devices significant improved. Intensive characterizations including scanning electron microscopy, electrochemical impedance spectroscopy can confirm that the presence of MgTiO3 shell layer can’t only retard charge recombination at CH3NH3PbI3/TiO2 interface, but also have a strong effect on the perovskite film growth. Based on the optimized treating concentration of 0.10 M, power conversion efficiency (PCE) of 10.39% could be achieved for the hole-conductor-free PSCs with excellent long-term stability, suggesting immense potential for large-scale industrial production in the future.
关键词： Carbon counter electrode,Perovskite solar cell,MgTiO3/TiO2,Mesoporous scaffold layer,Hole-conductor-free
更新于2025-09-23 15:19:57
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Cu Nanoparticle Array-Mediated III-V/Si Integration: Application in Series-Connected Tandem Solar Cells
摘要： The integration of III-V materials with crystalline Si (c-Si) is a promising pathway to design high-performance optoelectronic devices, including solar cells. We have previously reported high-efficiency III-V/Si tandem cells using our unique semiconductor bonding technique, termed smart stack. In the conventional smart stack cells, Pd nanoparticle (NP) arrays have been commonly employed as bonding mediators between III-V and c-Si; however, from an economical point of view, the use of other low-cost metals would be preferable. Therefore, this study focused on the possibility of Cu. A polystyrene-block-poly-2-vinylpyridine (PS-b-P2VP)-based block copolymer was utilized to prepare Cu NP arrays. Desired Cu NP arrays were achieved by starting with self-assembled PS-b-P2VP micelles preloaded with Cu2+ ions. Satisfying bonding properties (low-resistance interfaces) were confirmed when GaAs subcells were stacked on the Cu NP arrays formed on native oxide-removed c-Si subcells. Conversion efficiencies up to 25.9% have been demonstrated with triple-junction structures consisting of InGaP/GaAs top and c-Si bottom subcells. The long-term reliability of Cu NP array-mediated smart stack cells were also verified by the thermal cycle and damp heat tests. Hence, we have successfully confirmed that not only Pd but also Cu is available to realize high-efficiency smart stack cells.
关键词： III-V,Copper,block copolymer,solar cell,tandem,nanoparticle,silicon,self-assembly
更新于2025-09-23 15:19:57
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CoCl2 as film morphology controller for efficient planar CsPbIBr2 perovskite solar cells
摘要： High quality perovskite (PVK) film is quite important to reduce the energy loss (Eloss) and enhance the performance of planar CsPbIBr2 PVK solar cells (PSCs). In this work, 5% PbBr2 is substituted by CoCl2 in inorganic CsPbIBr2 PVK, acting as film morphology controller to slow down the crystallization process. It results in a dense and flat pinhole-free CsI(PbBr2)0.95(CoCl2)0.05 PVK film. Therefore, the trap state density is greatly reduced, which lead to reduce non-radiative recombination of carriers and Eloss, therefore, the open-circuit voltage (Voc) of the device is increased from 1.14V of control sample to 1.25V. The optimal photoelectric conversion efficiency (PCE) is enhanced to 10.43% relative to 6.93% of CsPbIBr2 PSCs. More importantly, the air stability of CsI(PbBr2)0.95(CoCl2)0.05 PSCs is greatly enhanced, which still maintain above 90% in the air of 25(cid:1) and RH=20% for 25 days without encapsulation. This work highlights the great effect of CoCl2 as a morphology controller on improving CsPbIBr2 film quality and device performance.
关键词： energy loss,inorganic perovskite solar cell,crystalline growth,charge transport,film quality
更新于2025-09-23 15:19:57
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Employing a Narrow-bandgap Mediator in Ternary Solar Cells for Enhanced Photovoltaic Performance
摘要： Ternary organic solar cells (OSCs) provide a convenient and effective means to further improve the power conversion efficiency (PCE) of binary ones via composition control. However, the role of the third component remains to be explored in specific binary systems. Herein, we report ternary blend solar cells by adding the narrow-bandgap donor PCE10 as the mediator into the PBDB-T:IDTT-T binary blend system. The extended absorption, efficient fluorescence resonance energy transfer, enhanced charge dissociation and induced tighter molecular packing of the ternary blend films enhance the photovoltaic properties of devices and deliver a champion PCE of 10.73% with an impressively high open-circuit voltage (VOC) of 1.03 V. Good miscibility and similar molecular packing behavior of the components guarantee the desired morphology in the ternary blend films, leading to solar cell devices with over 10% PCEs at a range of compositions. Our results suggest ternary systems with properly aligned energy levels and overlapping absorption amongst the components hold great promises to further enhance performance of corresponding binary ones.
关键词： ternary solar cell,energy transfer,induced crystallization property,non-fullerene acceptors,molecular mediator
更新于2025-09-23 15:19:57
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Investigation and influence of layer composition of tandem perovskite solar cells for applications in future renewable and sustainable energy
摘要： Future needs a clean source of generated power to meet its ever-increasing demand for electricity. One of the most cost-effective and practically viable sources for clean energy is solar Photovoltaic (PV).. By using tandem solar cells, the absorption range of the solar irradiation spectrum is increased which resulted in better efficiency than a single-junction solar cells. So our research work is based on Perovskite-Perovskite solar tandem cells of MA0.8CS0.2Pb(I0.5Br0.5)3 with 1.8 eV and MAPb0.5Sn0.5I3 with 1.2 eV. Large bandgap and small bandgap subcells give the power conversion efficiency (PCE) of 13.98 % and 18.21% respectively. By accumulating all subcells with suitable interconnecting and recombination layers, we achieved a PCE of 20.9 %. It also unleashes the prospective of all perovskite solar cells in order to achieve its maximum limit of 44.3%.
关键词： Perovskite,solar cell,Tandem,Energy bandgap,2T tandem
更新于2025-09-23 15:19:57
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Thermally Stable Perovskite Solar Cells with Efficiency over 21% via Bifunctional Additive
摘要： The rapid improvements in performance of organic-inorganic perovskite solar cells has been astonishing but its commercialized production requires further achievements on device stability and efficiency. Herein, we introduce a bifunctional additive, biuret, with multiple Lewis base groups to regulate the crystallization process of perovskite crystals and passivate the defects at grain boundaries. Compared with the control, methylammonium lead iodide (MAPbI3), films processed with biuret exhibit increased grain size, reduced trap states density, and more uniform local photoluminescence. The addition of biuret leads to suppressed trap-assisted nonradiative recombination and an efficiency improvement from 18.26% to 21.16%, which is among the highest efficiency for MAPbI3 solar cells with the mesoscopic structure. Meanwhile, as biuret interacts with uncoordinated Pb2+ and iodide from the iodoplumbate complex on two adjacent perovskite grains, the thermal durability of MAPbI3 film is enhanced due to the crosslink through chemical bonding. Under 85°C annealing in nitrogen, the biuret-modified device preserves 94% of its initial efficiency after 12 days while the control cells lose more than half the efficiency.
关键词： crystallization,defect passivation,bifunctional additive,perovskite solar cell,stability
更新于2025-09-23 15:19:57
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Effect of tunnel junction grown at different growth rates on the optical properties and improved efficiency of InGaP/GaAs double-junction solar cells
摘要： The optical properties of InGaP/GaAs double-junction solar cells (DJSCs) grown by metalorganic chemical vapor deposition were investigated using temperature- and excitation power-dependent photoluminescence (PL) measurements. The InGaP/GaAs DJSC samples studied were the same structures; however, the corresponding tunnel junctions were grown at different growth rates (1.0 and 1.5 ?/s). The PL spectrum measured at 10 K for both samples exhibited a strong main peak at ~1.97 eV with a weak shoulder peak at ~1.94 eV, which could be attributed to the emissions of disordered and ordered InGaP, respectively. A PL peak located at ~1.91 eV was observed under a low excitation power, originating from the donoreacceptor pair (DAP) transition. With the increase in the temperature, the emission related to the DAP of the sample grown at a growth rate of 1.0 ?/s was found to be less dominant compared with the sample grown at a growth rate of 1.5 ?/s. The power-conversion ef?ciency of the sample grown at a growth rate of 1.0 ?/s was improved compared to that of the sample grown at a growth rate of 1.5 ?/s, owing to fewer defect states. Our results help understand the luminescence properties of InGaP/GaAs DJSCs, which could be a crucial factor in fabricating high-ef?ciency solar cells.
关键词： InGaP/GaAs,Growth rate,Photoluminescence,Double-junction solar cell
更新于2025-09-23 15:19:57
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Improved photovoltaic performance of graphene-based solar cells on textured silicon substrate
摘要： Graphene has attracted much interest as an active layer in heterojunction solar cells due to its outstanding properties such as flexibility, transparency, mechanical strength and elevated carrier mobility. In this research, a new technique was presented in order to enhance the efficiency of graphene–based heterojunction solar cells by employing a textured silicon (Si) substrate. Here, two sets of devices were fabricated based on flat and pyramidal structure of Si and the photovoltaic properties of graphene/Si heterojunction solar cells were compared. Selective chemical dissolution of Si wafers was carried out in order to produce pyramidal skeleton. Reduced graphene oxide (rGO) was then transferred on pyramidal Si through electrophoretic deposition (EPD) technique. The evidence of graphene layers on Si substrates was studied using Raman spectroscopy, X–ray diffractometry (XRD) and atomic force microscopy (AFM) analysis. The morphology of samples indicated an enhancement in rGO/Si interface area when the pyramidal structure is applied. Moreover, the enhanced surface area of this sample which is due to elevated roughness of pyramidal structure and wrinkles of graphene layers promotes its antireflective behavior which was proven using reflectance spectroscopy. The average reflectance of the graphene layer on the textured Si was ~14% in the wavelength range of 400–800 nm which is lower than that of rGO on flat Si. The improved optical properties of graphene on pyramidal silicon can broaden its potential applications in optoelectrical devices such as high-efficiency solar cells. In order to study the photovoltaic properties of rGO/Si samples, a passive layer was formed on Si substrate and a square frame of Ag was coated on it which was acted as a top contact. The current–voltage characteristics showed that the efficiency of rGO/Si heterojunction solar cells was improved when textured silicon was applied.
关键词： Schottky junction solar cell,Heterojunctions,Thin films,Reduced graphene oxide,Silicon pyramids,Electrophoretic deposition
更新于2025-09-23 15:19:57
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Tuning electrolyte configuration and composition for fiber-shaped dye-sensitized solar cell with poly(vinylidene fluoride-co-hexafluoropropylene) gel electrolyte
摘要： Efficient energy generation device is desired to couple with soft electronics for driving devices. Due to frequent uses of soft electronics in indoor conditions, flexible fiber-shaped dye-sensitized solar cell (FDSC) is regarded as the most promising energy generation device due to high light-to-electricity conversion maintenance under weak dim light. Using gel electrolyte to assemble FDSC cannot only restrict electrolyte leakage but also improve device flexibility and stability especially under bending conditions. In this study, poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) gel electrolyte is used to fabricate FDSC composed of curled TiO2 nanotube/Ti wire photoanode and Pt counter electrode. It is the first time to control gel electrolyte configuration by adding different PVdF-HFP concentrations, and to optimize iodine concentration in electrolyte regarding to redox ability and electrolyte transmittance. Configuration of gel electrolyte is carefully analyzed to define porous layer and concrete layer of polymer for accumulating liquid electrolyte and inhibiting leakage and evaporation. The highest solar-to-electricity conversion efficiency of 6.32% is obtained for FDSC with 9% PVdF-HFP and 0.04 M I2 in electrolyte, due to well-defined cross-linking structure, abundant redox reactions, and high incident-light illumination through electrolyte. Electrochemical impedance spectroscopy and intensity-modulated photocurrent/photovoltage spectroscopy are used to analyze charge-transfer resistance and charge-collection efficiency.
关键词： Iodine,Cross-linking,Poly(vinylidene fluoride-co-hexafluoropropylene),Fiber-shaped dye-sensitized solar cell,Gel electrolyte
更新于2025-09-23 15:19:57
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Recent advancements in micro-crack inspection of crystalline silicon wafers and solar cells
摘要： The move towards in-line instrumentation quality assurance in photovoltaic industry has triggered new interest in development of novel methods and instruments for defect detection. Among the many tests that need to be carried out on silicon wafers and solar cells during the manufacturing process is the detection of micro-cracks. To date, the optical transmission method and luminescence technologies like electroluminescence and photoluminescence are popularly used by silicon wafer and solar cell manufacturers primarily due to their practicality and speed advantages. However, the increase in production throughput speeds and the recent change in the wafer sawing process where slurry-based sawing is gradually being replaced with diamond-wire sawing presents new challenges to the industries. This short perspective presents these new challenges and highlights breakthrough inventions in response to recent development. This article concludes by identifying some research opportunities that has emerged as a result of these recent developments.
关键词： Image Processing,Micro-crack,Solar Cell,Silicon Wafer,Machine Vision
更新于2025-09-23 15:19:57