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- 2018
- 3D display
- holographic display
- Augmented reality
- volumetric display
- liquid crystal
- blocking electrodes
- impedance spectroscopy
- liquid crystals
- electric conductivity
- Optoelectronic Information Science and Engineering
- Shanghai Jiao Tong University
- South Ural State University
- Technical University of Darmstadt
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One-pot synthesis of 3D Cu <sub/>2</sub> S–MoS <sub/>2</sub> nanocomposites by an ionic liquid-assisted strategy with high photocatalytic activity
摘要： Novel 3D Cu2S–MoS2(x : y) nanocomposites with different proportions of Cu2S (x) and MoS2 (y) are synthesized successfully by a one-step hydrothermal method with the assistance of the ionic liquid [BMIM]SCN. The characterization results show that the nanocomposites are self-assembled from nanosheets of Cu2S and MoS2, they display nanoflower morphology and a typical mesoporous structure. The fabrication mechanism of the nanocomposites is investigated using time-dependent experiments, which indicate the key role of the ionic liquid (IL) in the synthesis process. Furthermore, TAA is used as a sulfur source instead of the IL to form a Cu2S–MoS2 nanocomposite, with the aim of further investigating the effects of the IL on the morphology of the composite. Photodegradation of MB under visible light irradiation experiments were used as probe reactions to evaluate the photocatalytic performance of the as-prepared samples. All the nanocomposites show better catalytic activity than Cu2S and MoS2 monomers. Among the different Cu2S–MoS2(x : y) nanocomposites, the Cu2S–MoS2(1 : 1) composite exhibits the most excellent photocatalytic performance and cycling stability.
关键词： Cu2S–MoS2 nanocomposites,hydrothermal synthesis,photocatalytic activity,ionic liquid,methylene blue degradation
更新于2025-11-14 17:04:02
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Towards High Solar Cell Efficiency with Low Material Usage: 15% Efficiency with 14 ?μm Polycrystalline Silicon on Glass
摘要： This work showcases a bottom-up approach to creating silicon solar cells using a line-shaped laser. We report efforts to create thicker amorphous silicon passivation and contact layers as well as laser firing for low contact resistance. Collectively, a new in-house record efficiency of 15.1 % was achieved along with a clear pathway to reach 16 % efficiency with optimization of series resistance.
关键词： Foreign substrates,Liquid phase crystallized silicon,Passivation,Silicon Heterojunction Interdigitated back contact,Laser fired contacts
更新于2025-11-14 15:25:21
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Assessment of Bulk and Interface Quality for Liquid Phase Crystallized Silicon on Glass
摘要： This paper reports on the electrical quality of liquid phase crystallized silicon (LPC-Si) on glass for thin-film solar cell applications. Spatially resolved methods such as light beam induced current (LBIC), microwave photoconductance decay (MWPCD) mapping, and electron backscatter diffraction were used to access the overall material quality, intra-grain quality, surface passivation, and grain boundary (GB) properties. LBIC line scans across GBs were fitted with a model to characterize the recombination behavior of GBs. According to MWPCD measurement, intra-grain bulk carrier lifetimes were estimated to be larger than 4.5 μs for n-type LPC-Si with a doping concentration in the order of 1016 cm?3. Low-angle GBs were found to be strongly recombination active and identified as highly defect-rich regions which spatially extend over a range of 40–60 μm and show a diffusion length of 0.4 μm. Based on absorber quality characterization, the influence of intra-grain quality, heterojunction interface, and GBs/dislocations on the cell performance were separately clarified based on two-dimensional (2-D)-device simulation and a diode model. High back surface recombination velocities of several 105 cm/s are needed to get the best match between simulated and measured open circuit voltage (Voc), indicating back surface passivation problem. The results showed that Voc losses are not only because of poor back surface passivation but also because of crystal defects such as GBs and dislocation.
关键词： Bulk lifetime,heterojunction,grain boundaries (GBs),two-dimensional (2-D)-device simulation,liquid phase crystallized silicon (LPC-Si),light beam induced current (LBIC)
更新于2025-11-14 15:25:21
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Increased UV absorption properties of natural hydroxyapatite-based sunscreen through laser ablation modification in liquid
摘要： Sunfilters based on hydroxyapatite (HAp) and iron-containing compounds (Fe2O3 and calcium iron phosphates) are of increasing interest, as they show UV absorption without generating health endanger free radicals (usually observed when other inorganic sunscreens are used). In this paper, laser ablation of solids in liquids has been applied to improve the UV absorption properties of a HAp based Fe-containing sunscreen powder derived from cod fish bones. Two different laser wavelengths were explored (532 and 1064 nm, green and infrared respectively); an improved experimental device was used, to allow a fine control of the volume of the irradiated particles. Results show an increased UV absorbance for the laser-treated powders in comparison with the untreated ones; this can be explained considering the smaller particle size and increased surface area; the higher iron concentration in the powders may also be determinant. Enhanced absorption was also observed in the near-infrared range, making the powders even more suitable for sunscreen applications. The green laser was more effective than the infrared one. Overall, laser ablation showed to be a powerful technique to control the size of the sunscreen particles and tailor their optical properties.
关键词： hydroxyapatite,Liquid laser ablation,UV protection,sunscreen
更新于2025-11-14 15:25:21
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All-Thin-Film Tandem Cells Based on Liquid Phase Crystallized Silicon and Perovskites
摘要： Combining the emerging perovskite solar cell technology with existing silicon approaches in a tandem cell design offers the possibility for new low-cost high-performance devices. In this study, the potential of liquid phase crystallized silicon (LPC-Si) solar cells as a bottom cell in an all-thin-film tandem device is investigated. By optimizing the current output of a four terminal tandem using optical simulations and state-of-the-art electrical properties of the top and bottom cells, we show that an efficiency of 23.3% can be reached, where 7.2% are attributed to the LPC-Si bottom cell. Including the potential of future developments of both sub cells, efficiencies of over 28% are estimated. Electrical and optical measurements of the bottom cell are performed by attaching a perovskite and a cutoff filter to the front side of the interdigitated back contacted LPC-Si cells. The measurements using a cutoff filter show a high impact of the filtered incident light spectrum on the open circuit voltage of the LPC-Si cell. A comparison of the simulated and measured absorptance shows that especially the optical properties of the transparent conductive oxides and recombination losses in the LPC-Si cause high current losses. Combining the measured data of the filtered LPC-Si cells and the semitransparent perovskite cells, yields a realistic estimation for the efficiency of a state-of-the-art four-terminal tandem device of 19.3%.
关键词： tandem devices,Liquid phase crystallization (LPC),perovskite solar cells,thin film photovoltaics
更新于2025-11-14 15:25:21
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Large-scale fabrication of highly elastic conductors on a broad range of surfaces
摘要： Recently, a great stretchability progress has been witnessed in elastic electronics. However, such electronics are either costly, toxic, or cannot pattern on a broad range of substrates which limit their large-scale fabrications and applications. Here, to overcome those limitations, an ink comprising liquid metal particles and desirable polymer solutions is developed. The polymer solutions in our ink can be adjusted to print on different surfaces and avoid toxic organic solvents in most cases. The ink can be sintered by small strain (~10%) in room temperature. Using our ink, conductors with high stretchability (380,000 S/m at a strain of 1000%) can be printed in low consumption (liquid metal consumption 3.27 mg/cm2), in large area (bestrew entire surface of a T-shirt) and in high throughputs (~105 cm2 per hour). The ink can be printed on a T-shirt to achieve a smart wearable platform that integrates electronics for strain/electrophysiology/electrochemistry detection, and temperature monitoring/controlling.
关键词： Stretchable conductors,wearable devices,low-cost,liquid metal,large-scale fabrication,printable electronics
更新于2025-11-14 15:19:41
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Light management in crystalline silicon thin-film solar cells with imprint-textured glass superstrate
摘要： The implementation of light management textures in thin-film solar cells often simultaneously causes an undesired deterioration of electronic performance. Here, we introduce a simple yet effective technique for improved light management in liquid phase crystallized silicon thin-film solar cells on glass. By imprinting pyramidal textures on the sun-facing side of the glass superstrate, absorber and functional layers of the device remain unaffected while light in-coupling is significantly increased. An increase of short-circuit current density by 2.5 mA cm2 was observed by texturing the glass in this way, corresponding to an enhanced power conversion efficiency from 12.9% to 13.8%. Optical simulations allow to attribute the increase in equal shares to an anti-reflective effect at the air-glass interface as well as light scattering and multiple passes through the glass. The technology allows for independent optimization of optical performance without compromising on electronic material issues and is therefore useable for any other solar cell technology using a glass superstrate.
关键词： Light management,Nano-imprint lithography,Liquid phase crystallization,Thin-film solar cells,Silicon
更新于2025-10-22 19:40:53
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Percolation Effects in Electrolytically-Gated WS <sub/>2</sub> /Graphene Nano:Nano Composites
摘要： Mixed networks of conducting and non-conducting nanoparticles show promise in a range of applications where fast charge transport is important. While the dependence of network conductivity on the conductive mass fraction (Mf) is well understood, little is known about the Mf-dependence of mobility and carrier density. This is particularly important as the addition of graphene might lead to increases in the mobility of semiconducting nanosheet-network transistors. Here, we use electrolytic gating to investigate the transport properties of spray-coated composite networks of graphene and WS2 nanosheets. As the graphene Mf is increased, we find both conductivity and carrier density to increase in line with percolation theory with percolation thresholds (~8 vol%) and exponents (~2.5) consistent with previous reporting. Perhaps surprisingly, we find the mobility increases modestly from ~0.1 cm2/Vs (for a WS2 network) to ~0.3 cm2/Vs (for a graphene network) which we attribute to the similarity between WS2-WS2 and graphene-graphene junction resistances. In addition, we find both the transistor on- and off-currents to scale with Mf according to percolation theory, changing sharply at the percolation threshold. Through fitting, we show that only the current in the WS2 network changes significantly upon gating. As a result, the on-off ratio falls sharply at the percolation threshold from ~104 to ~2 at higher Mf. Reflecting on these results, we conclude that the addition of graphene to a semiconducting network is not a viable strategy to improve transistor performance as it reduces the on:off ratio far more than it improves the mobility.
关键词： graphene,ionic liquid,thin film transistor,WS2,carrier density,composite,mobility,Printed electronics
更新于2025-10-22 19:40:53
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Facile and Green Synthesis of Graphene-Based Conductive Adhesives via Liquid Exfoliation Process
摘要： In this study, we report a facile and green process to synthesize high-quality and few-layer graphene (FLG) derived from graphite via a liquid exfoliation process. The corresponding characterizations of FLG, such as scanning electron microscopy (SEM), transmission electron microscope (TEM), atomic force microscopy (AFM) and Raman spectroscopy, were carried out. The results of SEM show that the lateral size of as-synthesized FLG is 1–5 μm. The results of TEM and AFM indicate more than 80% of graphene layers is <10 layers. The most surprising thing is that D/G ratio of graphite and FLG are 0.15 and 0.19, respectively. The result of the similar D/G ratio demonstrates that little structural defects were created via the liquid exfoliation process. Electronic conductivity tests and resistance of composite ?lm, in terms of different contents of graphite/polyvinylidene di?uoride (PVDF) and FLG/PVDF, were carried out. Dramatically, the FLG/PVDF composite demonstrates superior performance compared to the graphite/PVDF composite at the same ratio. In addition, the post-sintering process plays an important role in improving electronic conductivity by 85%. The composition-optimized FLG/PVDF thin ?lm exhibits 81.9 S·cm?1. These results indicate that the developed FLG/PVDF composite adhesives could be a potential candidate for conductive adhesive applications.
关键词： conductive adhesives,liquid exfoliation,graphene,?exiable,polyvinylidene ?uoride
更新于2025-09-23 15:23:52
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Linear and Nonlinear Optical Properties of Few-Layer Exfoliated SnSe Nanosheets
摘要： Monochalcogenides of group IV elements have been considered as phosphorene analogs due to their similar crystal and electronic structure. Here, few-layer SnSe nanosheets are synthesized by a sonication-assisted liquid phase exfoliation process and their linear and nonlinear optical properties are examined. The as-exfoliated few-layer (FL) SnSe demonstrates layer thickness from 2 to 10 nm and lateral size of 150 nm with high crystallinity. Optical measurement confirms the layer-number dependent bandgap, which is also corroborated by first-principle calculation. In addition, the FL SnSe shows a transition from saturable absorption to reverse saturable absorption with the increase of pumping power, and the nonlinear absorption is characterized by an ultrafast response time of picosecond scale. The nonlinear optical response in FL SnSe could be explained by defect-involved recombination of photogenerated carriers as well as the Auger scattering process, which is further enhanced by structural two-dimensionality.
关键词： nonlinear optics,phosphorene analogue,SnSe,liquid-phase exfoliation,2D semiconductors
更新于2025-09-23 15:23:52