Abstract: A solar cell includes a substrate, a doped pattern, a contact layer, and an electrode. The substrate includes a first surface onto which sunlight is incident and a second surface facing the first surface. The doped pattern is formed on the second surface of the substrate and the contact layer is formed on the doped pattern. The electrode is formed on the contact layer and is electrically connected to the doped pattern. Accordingly, a contact resistance between the substrate and the electrode may be decreased, so that the doped pattern and the electrode may be uniformly formed and a power efficiency of the solar cell may be improved.

Abstract: A method for manufacturing a solar cell includes disposing a first doping layer on a substrate, disposing a diffusion preventing layer on the first doping layer, patterning the first doping layer and the diffusion preventing layer to expose a portion of the substrate, forming a second doping layer which is disposed on the exposed portion of the substrate on the diffusion preventing layer, diffusing an impurity from the first doping layer to form a first doping region in a surface of the substrate and diffusing an impurity from the second doping layer to form a second doping region in the surface of the substrate surface, wherein the exposed portion of the substrate formed by patterning the first doping layer and the diffusion preventing layer and a portion of the remaining first doping layer and the diffusion preventing layer which are not patterned are alternately arranged with a lattice shape, and the first doping region and the second doping region are alternately arranged with the lattice shape.

Abstract: The invention relates to methods for fabricating ceramic nanocomposite powders, comprising a ceramic matrix and carbon nanotubes homogeneously dispersed in the ceramic matrix. The ceramic nanocomposite powders of the invention can prevent property deterioration due to agglomeration of carbon nanotubes.

Abstract: Disclosed is a method for fabrication of porous carbon fibers. More particularly, the method for fabrication of porous carbon fibers comprises the steps of: processing starch to prepare a gelled starch solution; adding organic acid to the gelled starch solution to prepare a starch solution; dissolving carbon nanotubes in a solvent and adding fiber formable polymer thereto to prepare a carbon nanotube/fiber formable polymer solution; mixing the starch solution with the carbon nanotube/fiber formable polymer solution obtained from the above steps, in order to prepare a carbon nanotube/starch/fiber formable polymer solution; electro-spinning or wet-state spinning the prepared carbon nanotube/starch/fiber formable polymer solution to produce starch composite fibers; oxidation heating the starch composite fibers, then, executing carbonization and vacuum heat treatment of the heated fibers, so as to fabricate the porous carbon fibers.

Abstract: Disclosed is a method for fabricating carbon nanotube-metal-polymer nanocomposites, in particular, to a method for fabricating a carbon nanotube-metal-polymer nanocomposite wherein the carbon nanotubes decorated with metal portion in a necklace form are homogeneously dispersed in a polymer base. The method for fabricating a carbon nanotube-metal-polymer nanocomposite comprises: preparing carbon nanotube-metal nanocomposite powder by introducing a polyol reducing agent as well as metal precursor in a carbon nanotube colloidal solution and heating the same; dispersing the carbon nanotube-metal nanocomposite powder in a polymer base; and curing the polymer base to form the carbon nanotube-metal-polymer nanocomposite. According to the present invention, as the carbon nanotubes decorated with metal particles in a necklace form are homogeneously dispersed in the polymer base, microwave absorbing and shielding properties of the final product are improved.

Abstract: The present invention relates to a long-life carbon nanotube field emitter with a three-dimensional structure and method for fabricating the same. Since the emitter having an extended area according to the design of the present invention can minimize the current density flowing per single wire of the carbon nanotube, it can be expected that the damage of the carbon nanotube is minimized so that the lifetime of the field emitter can be significantly improved and the commercialization of the carbon nanotube field emitter will be advanced.

Abstract: The invention relates to methods for fabricating ceramic nanocomposite powders, comprising a ceramic matrix and carbon nanotubes homogeneously dispersed in the ceramic matrix. The ceramic nanocomposite powders of the invention can prevent property deterioration due to agglomeration of carbon nanotubes.