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A method to detect triplet exciton transfer from singlet fission materials into silicon solar cells: Comparing different surface treatments
摘要： Singlet fission is one of the most promising routes to overcome the single-junction efficiency limit for solar cells. Singlet fission-enhanced silicon solar cells are the most desirable implementation, but transfer of triplet excitons, the product of singlet fission, into silicon solar cells has proved to be very challenging. Here, we report on an all optical measurement technique for the detection of triplet exciton quenching at semiconductor interfaces, a necessary requirement for triplet exciton or charge transfer. The method relies on the growth of individual, single-crystal islands of the singlet fission material on the silicon surface. The islands have different heights, and we correlate these heights to the quenching efficiency of triplet excitons. The quenching efficiency is measured by spatially resolved delayed fluorescence and compared to a diffusion–quenching model. Using silicon capped with a blocking thermal oxide and aromatic monolayers, we demonstrate that this technique can quickly screen different silicon surface treatments for triplet exciton quenching.
关键词： singlet fission,delayed fluorescence,surface treatments,triplet exciton transfer,silicon solar cells
更新于2025-09-23 15:19:57
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Progress of Triple Cation Organometal Halide Perovskite Solar Cells
摘要： Organometal halide perovskites (PVSs) are a type of promising absorbing materials utilized in photovoltaic devices for their ambipolar charge carrier transporting properties, tunable bandgap, and solution processability. Among them, triple cation perovskites (TC-PVSs) have attracted considerable research interest. Herein, TC-PVSs are compared with conventional PVSs to demonstrate their superiority in phase stabilization and structural stability. In addition, surface treatment and structure adjustment methods are provided for device fabrication. Furthermore, the stability of TC-PVSs and the corresponding devices are discussed, and the challenges and perspectives for large-area ?exible device manufacturing are provided. It is expected that this review could be helpful to understand the rapid development of TC-PVS solar cells from more facets.
关键词： stability improvement,deposition methods,architecture adjustments,triple cation perovskites,surface treatments
更新于2025-09-19 17:13:59
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Atomic structure revolution and excellent performance improvement of composites induced by laser ultrafine-nano technology
摘要： Carbon nanotubes (CNTs) reinforced high-entropy alloy composites (HEACs) were fabricated on a TA2 titanium alloy by mean of a laser melting deposition (LMD) of the FeCoCrAlCu-(nano-SiB6)-(Ni/Ag-coated CNTs) mixed powders, noting that large quantities of the ultrafine nanocrystals (UNs) were formed, portion of them were able to obtain the enormous energy from laser beam, which were able to permeate into the original ordered atom arrangement due to the high diffusion rates and their ultrafine microstructure. In substance, partial UNs can destroy the balanced state of atoms, increasing significantly the free energy of the crystal boundaries. Such CNTs/UNs modified LMD composites showed the better corrosion/high-temperature oxidation resistance properties than those of the TA2 alloy. Identification of the synthetic UNs in such LMD HEACs, more importantly the UNs transition effect, contributes theoretical/experimental basis to upgrade the quality of the industrial light alloy.
关键词： Metal-matrix composites (MMCs),Surface treatments,Laser melting deposition,Nanocomposites,Powder processing
更新于2025-09-16 10:30:52
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Laser treatment surface: An innovative method to increase the adhesive bonding of ENF joints in CFRP
摘要： Recently, many studies showed the opportunity to use a CO2 laser for treating the surfaces for structural bonding. In this work, a study on the effectiveness of a laser texturing on ENF bonded joints made with CFRP and epoxy adhesive has been developed. The experimental results showed that the use of this technology allows obtaining mechanical resistances of the bonded joints higher than 80% compared to untreated ones. Furthermore, a numerical model is proposed to forecast the response of the ENF specimens, and the numerical results are in good agreement with the experimental ones. This work represents a basis for the development of an innovative approach to design the laser texturing as a function of the applied stress.
关键词： A. Adhesive joints,C. Finite element analysis (FEA),A. Polymer-matrix composites (PMCs),B. Surface treatments,B. Debonding
更新于2025-09-12 10:27:22