Abstract:
A NAND-type flash memory device including select transistors with an impurity region for restraining punch-through is provided to prevent a non-selected string from being programmed by restraining short channel effect and hot carrier effect of a string select transistor and a ground select transistor using gate patterns. First and second impurity regions(69b,69s) are formed in a semiconductor substrate(51). First and second select gate patterns(SGP1,SGP2) are disposed on the semiconductor substrate between the first and second impurity regions, adjoining the first and second impurity regions. A plurality of cell gate patterns(WP1,WP2,WP3,WP4) are disposed between the first and the second select gate patterns. A first anti-punchthrough impurity region(67b) comes in contact with the first impurity regions, overlaying a first edge of a first select gate pattern adjacent to the first impurity region. A second anti-punchthrough impurity region(67s) comes in contact with a second impurity region, overlaying a first edge of a second select gate pattern adjacent to the second impurity region. The semiconductor substrate between the first and the second anti-punchthrough impurity regions has a uniform impurity density along a direction parallel with the surface of the semiconductor substrate. Each cell gate pattern can include a tunnel insulation layer, a floating gate, an intergate dielectric and a control gate electrode that are sequentially formed.
Abstract:
게이트 재산화공정전에 질소플라즈마 도핑을 실시하여 게이트 금속막의 산화를 억제시킬 수 있는 반도체 장치의 게이트 형성방법을 개시한다. 반도체 장치의 게이트 형성방법은 반도체 기판상에 폴리실리콘막 및 금속막을 증착하는 단계를 포함한다. 상기 금속막 및 폴리실리콘막을 패터닝하여 게이트를 형성한다. 질소 플라즈마 도핑을 실시하여 상기 게이트의 금속막의 측면을 질화처리한다. 상기 게이트의 폴리실리콘막을 재산화시켜 준다. 상기 질소 플라즈마 도핑은 글로우방전 플라즈마, RF 플라즈마 및 마이크로 웨이브 플라즈마로부터 선택되는 플라즈마를 사용하며, 질소의 농도는 1x10 12 ions/㎠ 내지 1x10 17 ions/㎠ 이다. 상기 금속막은 WSix/TiN/W, TiN/W, WSix, WSix/WN/W, WN/W, WSix/TaN/W, TaN/W, CoSi2 및 NiSi 로부터 선택된다.
Abstract:
A semiconductor device includes a first conductive layer on a semiconductor substrate, a dielectric layer including a high-k dielectric material on the first conductive layer, a second conductive layer including polysilicon doped with P-type impurities on the dielectric layer, and a third conductive layer including a metal on the second conductive layer. In some devices, a first gate structure is formed in a main cell region and includes a tunnel oxide layer, a floating gate, a first high-k dielectric layer, and a control gate. The control gate includes a layer of polysilicon doped with P-type impurities and a metal layer. A second gate structure is formed outside the main cell region and includes a tunnel oxide layer, a conductive layer, and a metal layer. A third gate structure is formed in a peripheral cell region and includes a tunnel oxide, a conductive layer, and a high-k dielectric layer having a width narrower than the conductive layer. Method embodiments are also disclosed.
Abstract:
반도체 장치의 제조 방법에서는, 도전막 패턴을 갖는 게이트 구조물을 기판 상에 형성한다. 게이트 구조물을 어닐링시켜서, 기판의 채널 영역과 게이트 산화막을 치유한다. 게이트 구조물에 산소 라디칼을 적용하여, 도전막 패턴의 측벽에 산화막을 형성시킨다. 기판을 먼저 어닐링하여 채널 영역과 게이트 산화막을 치유한 후 산화 공정이 수행되므로, 원하는 특성을 갖는 산화막을 형성시킬 수가 있게 된다.
Abstract:
소자 분리된 기판의 활성 영역 중간부분인 채널 형성 영역에 더미 패턴을 형성하는 단계, 더미 패턴을 등방성 식각하여 축소된 더미 패턴의 적어도 한 쪽에 활성 영역이 노출되도록 하는 단계, 선택적 결정 성장을 통해 노출된 활성 영역에서 단결정 성장을 실시하여 핀을 형성시키는 단계, 더미 패턴을 제거하는 단계, 핀 표면에 게이트 절연막을 형성시키는 단계, 핀을 가로지르는 게이트 도전막 패턴을 형성하는 단계를 구비하여 이루어지는 핀 구조 전계 트랜지스터 형성 방법이 개시된다. 본 발명에 따르면, 현재의 노광 장비 해상력의 한계로 형성하기 어려운 병렬 핀 패턴을 기판에 효과적으로 형성할 수 있어 고집적 반도체 장치에서 단채널 효과를 방지하고 트랜지스터 구동 전류를 증가시키기 용이하다.
Abstract:
PURPOSE: A method for forming gate stacks is provided to prevent oxidation of a metal layer and restrain a reaction between a metal nitride layer and polysilicon by performing a re-oxidation process for a polysilicon/metal gate electrode before forming the metal nitride layer and the metal layer. CONSTITUTION: A polysilicon electrode pattern is formed by patterning a gate oxide layer, a polysilicon layer, and a first mask, which are formed on a semiconductor substrate. A re-oxidation process is performed to recover damage of the gate oxide layer in the process for forming the polysilicon electrode pattern. The first mask is removed therefrom. An oxide layer is formed on the semiconductor substrate and the polysilicon electrode pattern to expose a surface of the polysilicon electrode. A metal nitride layer, a metal layer and a second mask are sequentially formed on the oxide layer and the polysilicon electrode. A metal nitride layer, a metal layer, and a second mask pattern are formed on the polysilicon electrode.
Abstract:
PURPOSE: A method for forming an FET(Field Effect Transistor) of a semiconductor device is provided to minimize the deterioration of transistor characteristics due to a short channel effect by forming a source/drain region in an epitaxial layer. CONSTITUTION: An isolation layer(102) is formed on the first conductive type semiconductor substrate(101) for defining an active region. A dummy gate pattern is formed on the active region. An epitaxial layer(104) is formed at both sides of the dummy gate pattern on the active region. The second conductive type impurity diffusion layer(106) is formed in the epitaxial layer. A dummy gate groove(110) is formed by removing the dummy gate pattern for partially exposing the active region and the sidewalls of the epitaxial layer. A gate isolating layer(116) and a gate electrode layer are sequentially formed in the dummy gate groove. The gate electrode layer is polished until the gate isolating layer on the epitaxial layer is exposed. A gate electrode(117b) is formed by selectively patterning the gate electrode layer.
Abstract:
A method of selective epitaxial growth performed by sequentially and repeatedly introducing a source gas, an etching gas, and a reducing gas in the reaction chamber, wherein controlled epitaxial layer doping may be obtained by introducing a dopant source gas during introducing any one of the source gas, an etching gas, and a reducing gas, and thereby producing a smooth and uniform epitaxial layer on a predetermined region of a semiconductor substrate.
Abstract:
PURPOSE: A trench isolation method is provided to improve local concentration of an electric field and stress by performing an annealing process in a hydrogen atmosphere so that the profile of a trench varies and the edge and corner portion of the trench is rounded. CONSTITUTION: An etch mask pattern is formed on a semiconductor substrate(100). The semiconductor substrate is etched to form the trench by using the etch mask pattern as an etch mask. An insulation layer filling the trench is formed. The etch mask pattern is eliminated to form an isolation layer(116a). An annealing process is performed regarding the entire surface of the semiconductor substrate so that the width of the lower portion of the trench is relatively broader than that of the upper portion of the trench.
Abstract:
An improved track belt tire is constructed of a removable tread belt assembly mounted to the outer circumferential surface of an inflatable tire carcass. A unique track belt design restrains the track from expanding while simultaneously improving the secure mounting of the track to the carcass and providing improved penetration protection. Also, the improved track belt will maintain a flatter tread profile which in turn will improve tread life and durability.