Abstract:
A high-voltage semiconductor device and a manufacturing method thereof are provided to obtain a high breakdown voltage characteristic by using benzocyclobutyn. A silicon carbide substrate(240) having high doping density is formed on a cathode electrode(250). A base layer(230) having low density is formed on the silicon carbide substrate to obtain high breakdown voltage characteristics. A thermal oxide layer(220) having low surface charge density and high field intensity is formed on the base layer. A polymer-based benzocyclobutyn layer(210) having high field intensity is formed on the thermal oxide layer. A termination structure comes in contact with the base layer through the thermal oxide layer and the polymer-based benzocyclobutyn layer. A metal layer for anode electrode comes in contact with the thermal oxide layer and the polymer-based benzocyclobutyn layer.
Abstract:
An apparatus for growing a single crystal is provided to easily fabricate an n-type low-resistance semiconductor substrate by easily adjusting the density of nitrogen rarely adjusted by injecting only a silicon material while using silicon carbide material powder. A porous graphite plate(205) and a carbon silicon powder material(206) are alternately positioned in the lower part in a graphite crucible(201). A silicon carbide seed(204) attached to a support part(203) is positioned to confront the porous graphite plate and the carbon silicon powder material, separated from the porous graphite plate and the carbon silicon powder material. A silicon powder material is injected to the upper part of the graphite crucible including the silicon carbide seed to form a silicon melt(202). The silicon carbide powder material, the porous graphite plate and the silicon melt in the graphite crucible are heated in a reaction chamber(208) of a vacuum state so that carbon and silicon materials are transferred from the silicon carbide powder material, the porous graphite plate and the silicon melt to the seed to grow a silicon carbide single crystal. The temperature of the lower part of the graphite crucible in which the porous graphite plate and the carbon silicon powder material are positioned can be higher than that of the upper part of the graphite crucible in which the silicon carbide seed is positioned, wherein the temperature gradient is from 1 °C/centimeter to 20 °C/centimeter.
Abstract:
The present invention relates to a SiC device manufacturing method with decreased interface states of SiC and SiO_2 interfaces. The SiC device manufacturing method with decreased interface states of SiC and SiO_2 interfaces, comprises a first step of disassembling gases with nitrogen atoms in the plasma state, adsorbing the resultant nitrogen atoms, nitrogen ions, or radicals with nitrogen onto an SiC surface and making the resultant components react to the SiC surface; and a second step of forming a SiO_2 film on the SiC surface after performing the first step. The SiC surface is directly treated with mixed gases including gases with nitrogen atoms in the plasma state, and the SiO_2 film is deposited on the treated SiC surface. The interface states of the SiC and SiO_2 interfaces can be favorably decreased as the molecules of the gases with nitrogen atoms are effectively divided into atoms or ions in the plasma state.
Abstract:
One embodiment of the present invention relates to a method for manufacturing an SiC UMOSFET with low gate resistance. A screen oxide layer and a trench etch prevention hard mask layer are formed on an SiC wafer. A gate insulation layer is formed on the inner wall of the trench. The trench is filled by depositing polysilicon and a metal layer.
Abstract:
본 발명은 전계방출 소자의 제조방법 및 그 전계방출 소자에 관한 것으로서, 금속 디스크를 가공하는 제1단계와; 상기 가공된 금속 디스크의 배면에 내산화층을 형성하는 제2단계와; 상기 금속 디스크의 측면 및 상면 가장자리 부분에 금속층을 증착하는 제3단계와; 상기 금속층이 증착된 금속 디스크를 산화시켜, 상기 금속 디스크의 상면에서 상기 금속층이 증착되지 않은 부분에서는 금속 나노선을 성장시키고, 상기 금속층이 증착된 금속 디스크의 측면 및 상면 가장자리 부분에는 금속산화물 절연층을 성장시키는 제4단계;를 포함하여 이루어지는 것을 특징으로 하는 금속산화물을 이용한 고출력 전계방출 소자의 제조방법 및 이러한 제조방법에 의해 제조된 금속산화물을 이용한 고출력 전계방출 소자를 기술적 요지로 한다. 이에 의해 금속 디스크의 배면 및 측면 그리고 가장자리에서의 나노선 성장을 억제하는 공정을 개발하여 간단한 공정으로 저가의 나노선을 이용한 전계방출 소자의 제작이 가능하며, 전계방출 소자의 가장자리에서 발생하는 아크방전으로 인해 소자 및 전원회로의 파괴를 막아 소자의 특성을 향상시킬 수 있어 고효율, 고출력의 전계방출 소자의 제조를 용이하게 하는 이점이 있다.