Abstract: An apparatus for chemical vapor deposition is disclosed. An aspect of the present invention provides an apparatus for chemical vapor deposition that includes: a process chamber configured to demarcate a reaction space; a back plate placed above the reaction space and having a gas inlet in a middle thereof; a gas diffusion member arranged below and separated from the gas inlet and coupled to the back plate by a first coupling member and configured to diffuse process gas supplied through the gas inlet; a shower head placed below and separated from the back plate and the gas diffusion member and having a middle part thereof coupled to the gas diffusion member by a second coupling member and having a plurality of spray holes perforated therein; and a susceptor arranged below and separated from the shower head and supporting a substrate.

Abstract: The present invention discloses a method and an apparatus for forming a selective emitter of a solar cell. The apparatus for forming a selective emitter of a solar cell in accordance with the embodiment of the present invention includes: a transport means configured to transport a substrate having a first emitter layer formed on an upper surface thereof, the first emitter layer having n-type impurities diffused and formed therein, a table configured to be supplied with the substrate from the transport means and to support the supplied substrate, a mask, being placed on the upper side of the first emitter layer and having a patterned opening, and a ramp, being located above the table and applying a heat energy to the first emitter layer that is exposed though the mask.

Abstract: A method for forming a selective emitter of a solar cell and a diffusion apparatus for forming the same are provided. The method includes texturing a surface of a silicon substrate by etching the silicon substrate, coating an impurity solution on the surface of the silicon substrate, injecting a first thermal energy into the whole surface of the silicon substrate, and, while the first thermal energy is injected into the whole surface of the silicon substrate, injecting a second thermal energy by irradiating a laser beam into a partial region of the surface of the silicon substrate.

Abstract: A method of manufacturing a solar cell, which can improve productivity by improving a surface texturing process for effectively capturing incident light during a process for manufacturing the solar cell, is provided. The method includes cleaning a substrate, texturing a surface of the substrate, doping and diffusing impurities into the substrate, coating an anti-reflection layer on the substrate, formed metal electrodes on the substrate, and cutting off corner electrodes among the metal electrodes. The texturing of the surface of the substrate includes printing a mask having a predetermined pattern on the substrate through an imprint process, etching the substrate, and removing the mask.

Abstract: Disclosed is a nozzle for cold spray and a cold spray apparatus using the same. The nozzle for cold spray includes a hollow-type nozzle section. The nozzle section includes a convergence inlet section in which the cross-sectional area is converging, a throat area connected to the convergence end point of the inlet section, and an outlet section connected to the end point of the throat area. The nozzle for cold spray is provided with a spray tube located inside the convergence inlet section, the spray tube having a spray hole formed at its end point in such a way as to be placed at the throat area or the outlet section beyond the throat area. The speed of the powder flow at the outlet end point of the outlet section reaches 300-1,200 m/s.

Abstract: This invention provides a method of preparing a metal matrix composite, and a coating layer and bulk prepared by using the same and in particular, it provides a method of preparing a metal matrix composite, which comprises the steps of providing a substrate; preparing a mixed powder comprising i) a first metal powder comprising a metal, alloy or mixture particle thereof, ii) a second metal powder comprising an intermetallic compound forming metal particle which forms an intermetallic compound along with the metal or the alloy element of the alloy, and iii) a ceramic powder comprising a ceramic or mixture particle thereof; injecting the mixed powder prepared above into a spray nozzle for coating; coating the mixed powder on the surface of the substrate by accelerating the mixed powder in the state of non-fusion at a speed of 300 to 1,200 m/s by the flow of transportation gas flowing in the spray nozzle; and forming the intermetallic compound by the thermal treatment of the coated coating layer, and a coating l

Abstract: A gas-removing device serves to remove impurity gases from the air supplied to a fuel cell via an air supply system. The gas-removing device includes a porous material and an alternate adsorption membrane. The porous material has micropores formed therein in order to absorb impurity gas particles contained in the air. The alternate adsorption membrane is formed on the inner walls of the micropores of the porous material in order to further adsorb and retain at least one type of impurity gas particles from among the impurity gas particles absorbed by the porous material. The alternate adsorption membrane includes at least one positively charged layer and at least one negatively charged layer laid alternately to one another.

Abstract: The invention provides a method of preparing a wear-resistant coating layer comprising metal matrix composite and a coating layer prepared by using the same and more particularly, it provides a method of preparing a wear-resistant coating layer comprising metal matrix composite, which comprises the steps of providing a base material, preparing a mixture powder comprising a metal, alloy or mixture particle thereof having an average diameter of 50 to 100 um and a ceramic or mixture particle thereof having an average diameter of 25 to 50 um in a ratio of 1:1 to 3:1 by volume, injecting the mixture powder into a spray nozzle for coating, and coating the mixture powder on the surface of the base material by accelerating the mixture powder in the state of non-fusion at a rate of 300 to 1,200 m/s by the flow of transportation gas flowing in the nozzle and a coating layer prepared by using the same whereby the coating layer with high wear resistance and excellent resistance against fatigue crack on the surface of the