Abstract:
PURPOSE: An apparatus for condensing sunlight is provided to increase the photoelectric conversion efficiency of a solar cell by collecting uneven light over the surface of the solar cell. CONSTITUTION: In an apparatus for condensing sunlight, A body(12) has a disc shape including one side facing to a condensing side of a solar cell. A plurality of prisms(14) is formed in one side. . A plurality of prisms are formed in compartmentalized collection areas having identical space between them along circumferential direction. A plurality of prisms has different angles at each collection area Incident lights on the prisms are reflected by same angle and are projected to the condensing side. The condensing side has uniform light distribution substantially.
Abstract:
PURPOSE: A solar cell with a surface structure for reducing reflectivity and a manufacturing method thereof are provided to maximize photoelectric conversion efficiency by uniformly maintaining the reflectivity of a solar cell regardless of the wavelength of light. CONSTITUTION: A solar cell includes a silicon substrate. The silicon substrate includes a first surface and a second surface to which light is inputted. The second surface is opposite to the first surface. A first surface(101) includes a first opening(1011) and a second opening(1013). The direction of the first opening is inclined to the first surface.
Abstract:
A method for forming a ZnO nano-crystal directly on a silicon substrate is provided to omit additional processes when forming a silicon substrate based photoelectric cell by forming the amorphous ZnO-nano crystal within a Zn-Si-O complex thin film directly. In a method for forming a ZnO nano-crystal directly on a silicon substrate, a Zn-Si-O complex thin film is formed on a semiconductor substrate, and the Zn-Si-O complex thin film is annealed. Wherein, the ZnO nano crystal is formed within an amorphous Zn-Si-O complex thin film on a silicon substrate, and the Zn-Si-O complex thin film is formed by using a sputtering method.
Abstract:
본 발명은 상변화 물질의 접촉면적을 최대한 줄임으로써 저전력 및 고집적 특성을 갖는 상변화 물질을 이용한 상변화 메모리 및 그 제조방법에 관한 것이다. 이를 위해, 본 발명은 절연막/하부전극/기판에 상변화 물질을 증착하고 건식 식각을 통해 수직으로 에칭하여 절연막/하부전극의 벽면을 따라 상변화 물질의 스페이서가 형성되도록 하여 하부전극의 두께로 상변화 물질의 접촉면적이 결정될 수 있도록 한다. 또한, 트렌치 구조의 내부에 하부전극을 형성하고 상변화 물질을 증착한 후 건식 식각을 통해 수직으로 에칭하여 절연막의 벽면을 따라 상변화 물질의 스페이서가 형성되도록 하여 상변화 물질의 두께로 상변화 물질의 접촉면적이 결정될 수 있도록 한다.
Abstract:
PURPOSE: A method for growing quantum wires with various sizes on one substrate is provided by growing a triangular epitaxial layer with various sizes through a selective epitaxial growing method. CONSTITUTION: An oxide layer is deposited on a substrate. The oxide layer is etched so as to have a various sized area without an oxide layer. A triangular structure of the various sized area without the oxide layer is grown by a selective epitaxial growing method. The growing characteristic and surface characteristic in an epitaxial layer of the triangular structure is improved by controlling the rate of epitaxial growth. The rate of epitaxial growth is 0.52μm/hour in case of AlGaAs, and 0.7μm/hour in case of GaAs or InGaAs.
Abstract:
PURPOSE: A connecting method of a ferroelectric memory cell and a ferroelectric memory thereby are provided to perform a reading process and a writing process on a selected cell alone without interference between cells by connecting upper electrodes and sources of FETs(Field Effect Transistors) in columns and lower electrodes and drains of the FETs in rows using bit lines and word lines. CONSTITUTION: A ferroelectric memory cell array includes a plurality of ferroelectric memory cells. Each cell(1) includes a FET. The FET includes an upper electrode(2) and a lower electrode(3) of a gate with a metal-ferroelectric-metal-insulator-silicon structure, a source(4) and a drain(5). The upper electrode is connected to a write bit line(6) in column. The lower electrode is connected to a write word line(7) in row. The source is connected to a read bit line(9) in column. The drain is connected to a read word line(8) in row.
Abstract:
PURPOSE: A method of manufacturing a ferroelectric gate is provided to improve characteristics of the gate by using oxygen plasma RTA(Rapid Thermal Annealing). CONSTITUTION: Oxygen plasma RTA is performed for a ferroelectric thin film under a predetermined pressure. The ferroelectric thin film is used as a gate oxide layer. The temperature of RTA is in the range of 600 to 700 °C. The RTA period is in the range of 5 to 10 minutes. The power of 30 to 50 Watt is applied in order to generate oxygen plasma. The predetermined pressure of the RTA is 10¬-1 to 10¬-2 Torr. Oxygen concentration of the ferroelectric thin film is increased due to the oxygen plasma RTA.
Abstract:
PURPOSE: A write signal error protection circuit of a non destructive readout ferroelectric random access memory and a method for preventing the same are provided to effectively remove the write errors caused by a bitline charged by the write operation before the write operation by using the change of the address signal. CONSTITUTION: A write signal error protection circuit of a non destructive readout ferroelectric random access memory(NDRO-FRAM) includes a switch(30) for outputting a plurality of voltages by receiving an address signal, wherein each of the voltages has a different value each other, and a discharging nMOSFET(31) for discharging the electrical charges in the write bit line in response to the voltage.
Abstract:
본 발명은 선택성장법에 의한 고밀도 양자점 어레이 형성방법에 관한 것으로, 종래에는 갈륨비소기판에 전자선 또는 엑스선을 주사하여 V자형의 홈을 형성함으로써 그 갈륨비소기판에 손상을 주며, 그 V자형 홈의 가장 깊은 부분에 형성한 양자점을 사용하는 광전소자의 출력이 약해 사용효율이 감소하는 문제점이 있었다. 이와 같은 문제점을 감안한 본 발명은 습식식각으로 V자형 홈을 형성하고, 2차원적인 반복구조를 갖는 양자점을 유기금속 화학증착법을 사용하여 용이하게 형성함으로써, 그 양자점을 사용하는 광전소자의 출력을 증대시켜 광전소자의 광변환효율을 증대시키는 효과가 있다.
Abstract:
본 발명은 전류차단구조와 활성층을 동시에 형성하는 광전소자의 전류차단구조 형성방법에 관한 것으로, 종래 광전소자의 전류차단구조 형성방법은 먼저, 갈륨비소기판에 전자선 또는 엑스선을 사용하여 V자형 또는 U자형의 홈을 형성하고, 상기 형성된 V자형 또는 U자형홈의 가장 깊은 곳에 양자점 또는 양자세선을 형성하며 그 다음, 상기 양자점 또는 양자세선이 형성된 갈륨비소기판상에 갈륨비소에피층을 성장시키고 그 갈륨비소에피층에 이온을 주입하거나 확산법을 사용하여 전류차단구조를 형성하여, 그 공정단계가 복잡하고, 미세구조를 형성하는 것이 용이하지 않은 문제점이 있었다. 이와 같은 문제점을 감안한 본 발명은 갈륨비소와 산화알루미늄상에 갈륨비소에피층을 성장시켜 그 격자결함의 차를 이용하여 활성층과 전류차단구조를 동시에 형성함으로써 공정단계를 단순화하고, 용이하게 미세구조를 형성하며, 또한 그 수율을 증가시키는 효과가 있다.