Abstract: Disclosed are a perovskite compound, a method for producing the perovskite compound, a catalyst for a fuel cell including the perovskite compound, and a method for producing the catalyst. The perovskite compound overcomes the low stability of palladium due to its perovskite structural properties. Therefore, the perovskite compound can be used as a catalyst material for a fuel cell. In addition, the use of palladium in the catalyst instead of expensive platinum leads to an improvement in the price competitiveness of fuel cells. The catalyst is highly durable and catalytically active due to its perovskite structure.

Abstract: Disclosed are a metal single-atom catalyst and a method for preparing the same. The method uses a minimal amount of chemicals and is thus environmentally friendly compared to conventional chemical and/or physical methods. In addition, the method enables the preparation of a single-atom catalyst in a simple and economical manner without the need for further treatment such as acid treatment or heat treatment. Furthermore, the method is universally applicable to the preparation of single-atom catalysts irrespective of the kinds of metals and supports, unlike conventional methods that suffer from very limited choices of metal materials and supports. Therefore, the method can be widely utilized to prepare various types of metal single-atom catalysts. All metal atoms in the metal single-atom catalyst can participate in catalytic reactions. This optimal atom utilization achieves maximum reactivity per unit mass and can minimize the amount of the metal used, which is very economical.

Abstract: The present disclosure relates to a resistive random access memory device and a preparing method thereof.

Abstract: Disclosed is a method for preparing a carbon-supported platinum-transition metal alloy nanoparticle catalyst using a stabilizer. According to the method, the transition metal on the nanoparticle surface and the stabilizer are simultaneously removed by treatment with acetic acid. Therefore, the method enables the preparation of a carbon-supported platinum-transition metal alloy nanoparticle catalyst in a simple and environmentally friendly manner compared to conventional methods. The carbon-supported platinum-transition metal alloy nanoparticle catalyst can be applied as a high-performance, highly durable fuel cell catalyst.

Abstract: The present disclosure discloses a method of manufacturing a multilayer perovskite structure, and a multilayer perovskite structure and solar cell manufactured using the same. The method of manufacturing a multilayer perovskite structure according to an embodiment of the present disclosure includes a step of forming a first perovskite layer using a compound including a first perovskite precursor on a base substrate; a step of forming a second perovskite layer using a compound including a second perovskite precursor on a donor substrate; and a step of laminating the first and second perovskite layers so that the first and second perovskite layers contact each other and then applying heat or pressure to form a multilayer perovskite structure.

Abstract: An electronic device, such as, without limitation, a perovskite solar cell or a light emitting diode, includes an assembly including at least one electronic portion or component, and a composite coating layer covering at least part of the assembly including the at least one electronic portion or component. The composite coating layer includes a polymer material, such as, without limitation, PMMA or PMMA-PU, having nanoparticles, such as, without limitation, reduced graphene oxide or SiO2, embedded therein. The electronic device may further include a second coating layer including a second polymer material (such as, without limitation, PMMA or PMMA-PU without nanoparticles) positioned between the coating layer and the assembly.

Abstract: Disclosed is a method for preparing a carbon-supported metal oxide and/or alloy nanoparticle catalyst. According to the method, a carbon-supported metal oxide and/or alloy nanoparticle catalyst is prepared by depositing metal oxide and/or alloy nanoparticles on a water-soluble support and dissolving the metal oxide and/or alloy nanoparticles deposited on the water-soluble support in an anhydrous polar solvent containing carbon dispersed therein to support the metal oxide and/or alloy nanoparticles on the carbon. The anhydrous polar solvent has much lower solubility for the water-soluble support than water and is used to dissolve the water-soluble support.

Abstract: Various perovskite solar cell embodiments include a flexible metal substrate (e.g., including a metal doped TiO2 layer), a perovskite layer, and a transparent electrode layer (e.g., including a dielectric/metal/dielectric structure), wherein the perovskite layer is provided between the flexible metal substrate and the transparent electrode layer. Also, various tandem solar cell embodiments including a perovskite solar cell and either a quantum dot solar cell, and organic solar cell or a thin film solar cell.

Abstract: The present disclosure relates to a preparing method of a large-area perovskite thin film, comprising: forming an organic metal halide-alkylamine compound by exposing an organic metal halide compound having a perovskite structure to an alkylamine gas; preparing a coating solution by adding a solvent on the organic metal halide-alkylamine compound; and preparing a perovskite thin film by coating the coating solution on a substrate.

Abstract: The present disclosure relates to a method of fabricating a perovskite solar cell, including: forming an electron transport layer on a substrate; forming a light absorbing layer containing a perovskite material on the electron transport layer; forming a hole transport layer on the light absorbing layer; and forming an electrode on the hole transport layer. Herein, the forming of the light absorbing layer is performed by impregnating the substrate on which the electron transport layer is formed in a nonpolar solvent and performing a heat treatment thereto.

Abstract: The present invention relates to a process for preparing an electronic device comprising at least one layer selected from the group consisting of a upper electrode layer, a lower electrode layer, an organic layer and an inorganic layer, which comprises a step of introducing a nanoparticle layer or a nano/micro structure layer by adhering charged nanoparticles, before, after or during forming the layer.

Abstract: The present invention relates to a process for producing a 3-dimensional structure assembled from nanoparticles by using a mask having a pattern of perforations, which comprises the steps of: in a grounded reactor, placing a mask having a pattern of perforations corresponding to a determined pattern at a certain distance above a substrate to be patterned, and then applying voltage to the substrate to form an electrodynamic focusing lens; and introducing charged nanoparticles into the reactor, the charged particles being guided to the substrate through the pattern of perforations so as to be selectively attached to the substrate with 3-dimensional shape. According to the process of the present invention, a 3-dimensional structure of various shapes can be produced without producing noise pattern, with high accuracy and high efficiency.

Abstract: The present invention provides a 3-dimensional nanoparticle structure, wherein a plurality of structures formed by assembling nanoparticles is connected to form a bridge, and a gas sensor using the same.

Abstract: Provided is a flexible fuel cell.

Abstract: The present invention relates to a method for manufacturing a nanoparticle structure by focused patterning of nanoparticles, and a nanoparticle structure obtained by the above method. The method of the present invention is characterized by comprising the steps of: first of all, accumulating ions generated by corona discharge on a substrate where a micro/nano pattern is formed; inducing charged nanoparticles and ions generated by spark discharge to the micro/nano pattern of the substrate; and then focused depositing on the micro/nano pattern. According to the method of the present invention, an elaborate nanoparticle structure, which has 3-dimensional shape having complicated structure, can be effectively manufactured.

Abstract: The present invention relates to a process for producing a 3-dimensional structure assembled from nanoparticles by using a mask having a pattern of perforations, which comprises the steps of: in a grounded reactor, placing a mask having a pattern of perforations corresponding to a determined pattern at a certain distance above a substrate to be patterned, and then applying voltage to the substrate to form an electrodynamic focusing lens; and introducing charged nanoparticles into the reactor, the charged particles being guided to the substrate through the pattern of perforations so as to be selectively attached to the substrate with 3-dimensional shape. According to the process of the present invention, a 3-dimensional structure of various shapes can be produced without producing noise pattern, with high accuracy and high efficiency.