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Bifunctional nanoscale assemblies: multistate electrochromics coupled with charge trapping and release
摘要： We demonstrate controlled charge trapping and release, accompanied by multiple color changes in a metallo-organic bilayer. The dual functionality of the metallo-organic materials provides a fundamental insight into the metal-mediated electron transport pathways. The electrochemical processes are accompanied by distinct, four color–to–color transitions: red, transparent, orange, and brown. The bilayer consists of two elements: (i) a nanoscale gate consisting of a layer of well-defined polypyridyl ruthenium complexes bound to a flexible transparent electrode, and (ii) a charge storage layer consisting of isostructural iron complexes attached to the surface of the gate. This gate mediates or blocks electron transport in response to a voltage. The charge storage and release depend on the oxidation state of the layer of ruthenium complexes (= gate). Combining electrochemistry with optical data revealed mechanistic information: the brown coloration of the bilayer directly relates to the formation of intermediate ruthenium species, providing evidence for catalytic positive charge release mediated through the gate.
关键词： Thin films,Electrochromism,Metallo-organics,Electrochemistry,Charge storage
更新于2025-09-11 14:15:04
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Watching Space Charge Build up in an Organic Solar Cell
摘要： A method is presented to spatially resolve the space charge region in organic photovoltaics (OPVs) by measuring white-light bias EQE and optical modeling. The method is demonstrated for a model polymer/fullerene blend with imbalanced carrier mobilities. Furthermore, numerical and analytical means are derived to discuss the general thickness limits for OPVs with imbalanced transport.
关键词： thick films,imbalanced charge transport,quantum efficiency,Organic photovoltaics,space charge
更新于2025-09-11 14:15:04
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Improving the efficiency of silicon solar cells using in situ fabricated perovskite quantum dots as luminescence downshifting materials
摘要： Luminescence downshifting (LDS) layer integration has been proven to be an efficient way to ameliorate the poor UV-blue spectral response and improve the power conversion efficiency (PCE) for solar cells (SCs). By employing an in situ fabricated CH3NH3PbBr3 (CH3NH3?=?methylammonium, MAPbBr3) quantum dot/polyacrylonitrile (PAN) composite film as the LDS layer, we observed a clear enhancement in the external quantum efficiency (EQE) for silicon SCs, predominantly in the UV-blue region. With a theoretically calculated intrinsic LDS efficiency (ηLDS) of up to 72%, silicon SCs with the LDS layer exhibited an absolute value of 1% for PCE improvement in comparison to those without the LDS layer. The combination of easy fabrication and low cost makes it a practical way to achieve photovoltaic enhancement of Si-based SCs.
关键词： luminescence downshifting,quantum dots,composite films,silicon solar cells,perovskite
更新于2025-09-11 14:15:04
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Ca <sub/>3</sub> La <sub/>2</sub> Te <sub/>2</sub> O <sub/>12</sub> :Mn <sup>4+</sup> ,Nd <sup>3+</sup> ,Yb <sup>3+</sup> : an efficient thermally-stable UV/visible–far red/NIR broadband spectral converter for c-Si solar cells and plant-growth LEDs
摘要： Highly conductive PEDOT:PSS threaded HKUST-1 thin films with high porosity were prepared. The highest conductivity of these films was 13 S cm?1, nine orders of magnitude greater than that of pristine HKUST-1. A PEDOT:PSS threaded HKUST-1 thin film with 20 wt% PEDOT:PSS exhibits 300 times enhancement of the electrochemical performance of pristine HKUST-1 when applied as an electrode for thin-film-like supercapacitors.
关键词： thin films,HKUST-1,conductivity,supercapacitors,PEDOT:PSS
更新于2025-09-11 14:15:04
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Electrodeposition and Photocatalytic Performance of Self-Assembled Tulip Flower/Mulberry-Like CuO Nanostructures
摘要： Copper oxide as a p-type semiconductor has been widely used in the field of catalysis. Monoclinic CuO nanostructures with various shapes have been synthesized on indium tin oxide-coated glass substrates via electrodeposition with annealing at 400°C for 2 h, and the influence of different electrodeposition parameters on their properties investigated. X-ray diffraction analysis and scanning electron microscopy were used to characterize the phase structure and surface morphology, respectively, of the synthesized CuO films, and ultraviolet–visible spectrophotometry was used to study their optical absorption. Moreover, we measured their photocatalytic properties using photodegradation tests under light irradiation with methylene blue as a simulated organic pollutant. The results showed that the light absorbance of the CuO nanostructure was improved in the visible region. The photodegradation rate for methylene blue reached 93% in 210 min. The prepared nanomaterials are promising for use as good photocatalysis in the field of environmental treatment.
关键词： CuO films,photocatalytic properties,Electrodeposition,growth mechanism
更新于2025-09-11 14:15:04
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Highly photo-stable CsPbI3 perovskite quantum dots via thiol ligand exchange and their polymer film application
摘要： Highly photo-stable CsPbI3 perovskite quantum dots (PeQDs) were prepared using thiol as an exchanged ligand. Photoluminescence of CsPbI3 perovskite quantum dots can be maintained for a long time in UV via thiol ligand exchange. As an application, perovskite films were fabricated using the PeQDs and a cyclic olefin copolymer (COC). The thiol-treated PeQD films exhibited higher stability than the untreated films under irradiation with a blue light-emitting diode (LED).
关键词： thiol-capped CsPbI3 perovskite quantum dots,photo-stability,QD films,Ligand exchange
更新于2025-09-11 14:15:04
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Fabrication of Ag2S quantum dots sensitized CdSe photoelectrodes and its photoelectric performance
摘要： Well-aligned wheat-like CdSe nanorods array was fabricated by electrodeposition method, which was sensitized with Ag2S quantum dots (QDs) by using successive ionic layer adsorption and reaction (SILAR) method. The combination of five successive layers Ag2S QDs with CdSe shows maximum short-circuit photocurrent density of 36.88 mA/cm2. Compared with TiO2-based photoelectrode, the wheat-like CdSe nanorods array modified with Ag2S QDs exhibit improved photoelectrochemical (PEC) performance. The main reason for the enhancement of PEC is to use narrow band-gap semiconductor CdSe instead of the conventional wide band-gap oxide as the sensitized substrate of Ag2S QDs. In addition, the synthetic nanocomposites are characterized by analytical techniques such as XRD, UV–vis absorption spectroscopy, FESEM, HRTEM, EDX, XPS and EIS. The results indicate that Ag2S QDs are well grown on the surface of CdSe photoelectrodes. Meantime, the PEC performance of CdSe photoelectrodes has also been improved.
关键词： SILAR,Ag2S,CdSe,Thin films,Quantum dots
更新于2025-09-11 14:15:04
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Micro-structural, optical and vibrational spectra analysis of Lead sulphide, Cadmium doped PbS and Strontium doped PbS nano-structured thin films synthesized through Successive Ionic Layer Adsorption and Reaction technique for solar cell and infrared detector sensor applications
摘要： Nanostructured skinny or thin films have captivated or fascinated the research network all over the entire world. Successive Ionic Layer Adsorption and Reaction technique is well suited for producing large area deposition and multilayer thin films especially for solar cell like Dipping time, precursor concentration and number of process cycle. In the present investigation lead Sulphide (PbS), cadmium and strontium doped PbS thin films are deposited on a glass substrate by SILAR process at room temperature to study the various morphological, structural and optical properties of them.
关键词： Cadmium doped PbS,SILAR technique,Lead sulphide,Strontium doped PbS thin films,Energy gap
更新于2025-09-11 14:15:04
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Physical similarity of the processes of laser thermochemical recording on thin metal films and modeling the recording of submicron structures
摘要： Laser thermochemical recording is a flexible method for direct writing the binary planar structures (for instance, diffractive optical elements) by a local laser-induced oxidation of thin metal films. Unfortunately, due to excess of influencing parameters, search for regimes of high-resoluted recording could be complicated. The presented article proposes the way to analyze the hard-to-reach regimes of laser recording by modeling them with more convenient regimes (with different geometric and/or thermochemical parameters) based on their physical similarity.
关键词： Thin films,Laser direct writing,Laser thermochemical writing,Ultrahigh resolution,Laser-induced oxidation
更新于2025-09-11 14:15:04
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CH3NH3PbBr3 Nanocrystals Formed in situ in Polystyrene Used for Increasing the Color Rendering Index of White Leds
摘要： A new method is proposed for the formation of MAPbBr3 nanoparticles in situ in a dispersion of polystyrene in toluene in the absence (MAPbBr3@PS) and presence of a broad-band luminophor (MAPbBr3/GAG:Ce@PS). This method permits the lossless use of perovskite, a uniform distribution of the luminophor nanoparticles in the polymer matrix, and maintenance of a high photoluminescence quantum yield (~46%). The samples derived from MAPbBr3 have green photoluminescence with a maximum showing a blue shift in going from bulk perovskite powder to films due to a size effect. The use of nanocomposite films MAPbBr3/GAG:Ce@PS in white LEDs permits enhancement of the color rendering index to 92 with correlation color temperature >5800 K.
关键词： nanocomposite films,quantum yield,photoluminescence,hybrid halide perovskite
更新于2025-09-11 14:15:04