Abstract:
Provided is a wastewater treatment method using an electrodialysis reversal (EDR)-electrochemical wastewater treatment (EWT) combined process, the method including: separating inflow wastewater which contains nitrogen compounds into product water and concentrated water using an EDR facility; and decomposing the concentrated water into target materials to be eliminated from the wastewater in an EWT facility. Provided is a wastewater treatment method for decomposing inflow water containing a nitrogen-containing compound into target materials to be eliminated using an EWT facility alone. According to the wastewater treatment method, product water which is flowed out from an EDR facility can be reused as raw water, and the method guarantees reliability and stability by simultaneously processing recalcitrant COD and T-N in the concentrated water. The wastewater treatment method efficiently removes recalcitrant COD and T-N, which are derived from ethanolamine (ETA), in wastewater produced in a power plant and an industrial facility using ETA as a pH-adjusting agent. EDR-EWT process can be easily combined with a common wastewater treatment and can efficiently and stably treat wastewater containing recalcitrant COD and T-N. Therefore, the method can actively satisfy the strengthening environmental regulation criteria.
Abstract:
Provided is a method for fabricating a high-efficiency flexible thin film solar cell using a chalcopyrite-based compound semiconductor, including: forming a sacrificial layer on a substrate; forming a solar cell structure including a diffusion barrier dielectric on the top of the sacrificial layer; forming a support film on the top of the solar cell structure; carrying out selective etching of the sacrificial layer to separate the solar cell structure and the support film from the substrate; and integrating the solar cell structure with a heterogeneous flexible host substrate and removing the support film. In the high-efficiency flexible thin film solar cell using a chalcopyrite-based compound semiconductor according to the present disclosure, the thin film of GaAs diffusion barrier dielectric prevents diffusion of impurities since it has an optimized thermal expansion coefficient with reference to the CIGS (Cu(In,Ga,Al)(Se,S)) absorption layer and the lower electrode molybdenum layer, and inhibits lower electrode cracking and CIGS layer separation caused by the difference of thermal expansion coefficient of the CIGS layer, thereby improving the efficiency of the solar cell. In addition, the method uses heterogeneous integration technology and epitaxial lift off (ELO) that enables recycle of a substrate, and thus it is possible to provide a high-efficiency flexible thin film solar cell having improved cost efficiency and flexibility.
Abstract:
The present invention relates to a separator film for a lithium secondary battery, to a method for preparing same, and to a lithium secondary battery comprising same, and more particularly, to a separator film for a lithium secondary battery, comprising the compound expressed in chemical formula 1. The separator film and the lithium secondary battery comprising same according to the present invention have superior stability, cycle properties, etc.
Abstract:
A method of fabricating a metamorphic compound semiconductor solar cell is provided. The method includes forming a graded buffer layer on a support substrate, the graded buffer layer having a graded lattice constant from a bottom surface thereof toward a top surface thereof. A sacrificial layer is formed on the graded buffer layer. A solar cell structure is formed on the sacrificial layer. A support structure is formed on the solar cell structure. The sacrificial layer is selectively etched to separate the solar cell structure from the graded buffer layer. The separated solar cell structure is bonded to a host substrate.
Abstract:
Provided is a tandem solar cell including different kinds of solar cells and a method of manufacturing the same. The tandem solar cell includes an inorganic solar cell constituted by a compound semiconductor including a p-type compound semiconductor layer and a n-type compound semiconductor layer disposed on a lower electrode, an intermediate electrode disposed on the inorganic solar cell, and an organic solar cell disposed on the intermediate electrode and having an upper electrode on a surface thereof opposite to the intermediate electrode.
Abstract:
A fabrication method for a capacitor electrode is disclosed. The fabrication method for a capacitor electrode comprises forming a base polymer layer on an upper surface of the electrode; forming a cation exchanger or an anion exchanger on the base polymer layer; and drying the electrode. The base polymer layer may be formed by any one selected from a group consisting of a doctor blade coating method, a dipping method, a flooding method, a spin coating method, a spraying method, a brushing method, and a painting method. When being used in the water treatment process, the capacitor electrode fabricated using the method according to the present invention can enhance the ion removal rate and reduce power consumption.