Abstract:
PURPOSE: A method for forming a pin structure FET(Field Effect Transistor) is provided to be capable of overcoming the limitation of an exposure process for effectively forming a pin pattern on a substrate. CONSTITUTION: The first dummy pattern is formed on a channel forming region of a substrate(1). The second dummy pattern is formed by carrying out an isotropic etching process on the first dummy pattern. At this time, an active region is partially exposed to the outside through one side of the second dummy pattern. A pin(57) is formed on the active region by carrying out a selective crystal growing process. The second dummy pattern is removed from the resultant structure. A gate isolating layer(59) is formed on the pin. A gate conductive pattern is formed on the resultant structure, wherein the gate conductive pattern crosses the pin.
Abstract:
PURPOSE: A semiconductor device with a buried insulation layer pattern is provided to minimize a short channel effect and a punch-through phenomenon generated when a depletion layer in a semiconductor substrate near a drain region expands, by selectively removing a silicon germanium layer formed by an epitaxial growth technology and by forming a buried insulation layer pattern under the drain region. CONSTITUTION: An isolation layer pattern(200') is disposed in a trench for defining an active region, formed in a predetermined region of the semiconductor substrate(100). A gate electrode(214) crosses the active region and the isolation layer pattern. Impurity diffusion layers(240s,240d) are formed in the active region at both sides of the gate electrode. The buried insulation layer pattern(200a) is disposed under at least one of the impurity diffusion layers.
Abstract:
PURPOSE: A method for forming a semiconductor device having a metal silicide layer is provided to be capable of preventing the deterioration of the metal silicide layer due to a gate thermal oxidation process. CONSTITUTION: An active region is defined by forming an isolation layer(101) on a semiconductor substrate(100). A plurality of gate patterns are formed at the upper portions of the resultant structure. At this time, each gate pattern is formed by sequentially depositing a gate isolating layer, a gate electrode, and a deposition preventing layer. A gate thermal oxide layer(106) is formed at both sidewalls of each gate electrode. A spacer(108) is formed at both sidewalls of each gate pattern. An epitaxial layer having a predetermined height is the formed on the resultant structure. The upper surface of the gate electrode is exposed by etching the deposition preventing layer. Then, a metal silicide layer(125) is formed at the upper portions of the exposed gate electrode and the epitaxial layer.
Abstract:
PURPOSE: A metal-oxide-semiconductor(MOS) transistor is provided to improve the capacity by minimizing a defect like punch-through caused by extension of a depletion layer in a drain region and by reducing the resistance with a pad electrode in contact with the drain region. CONSTITUTION: The first silicon layer(100) is formed. A silicon germanium layer(101) is partially formed on the first silicon layer. The second silicon layer(102) is formed on the silicon germanium layer. A gate electrode is formed on the second silicon layer by interposing a gate insulation layer. A source region formed of impurities of the first density is formed under the second silicon layer extended from one side surface of the gate electrode. A drain region formed of impurities of the second density is formed under the second silicon surface extended from the other side surface of the gate electrode, confronting the source region. A blocking layer pattern(108) for controlling the generation of the depletion layer comes in contact with the side surface of the silicon germanium layer, corresponding to the bottom of the drain region.
Abstract:
PURPOSE: A method for isolating elements of a semiconductor device is provided to minimize a punch-through phenomenon between adjacent transistors by forming a silicon epitaxial layer using a selective epitaxial growth method. CONSTITUTION: A trench mask layer is formed on a semiconductor substrate(10). A trench mask pattern(20,30) is formed by patterning the trench mask layer. A trench(40) for limiting an active region is formed by etching the exposed semiconductor substrate(10). A trench spacer is formed on a sidewall of the trench(40) in order to expose a bottom side of the trench. A bottom gap region(60) is formed by etching the exposed bottom side of the trench. A bottom gap region(60) is filled by an epitaxial layer(70).
Abstract:
PURPOSE: A method for forming a selective epitaxial growth(SEG) of a semiconductor device is provided to maintain growth selectivity of an epitaxial process and to remarkably improve a growth rate, surface roughness and a groove density of an epitaxial layer, by sequentially injecting source gas and etch gas and by additionally injecting reducing gas. CONSTITUTION: An insulation layer pattern exposing a predetermined region of a semiconductor substrate is formed on the semiconductor substrate. The semiconductor substrate having the insulation layer pattern is loaded to the inside of a reaction chamber. Source gas is injected to the reaction chamber for the first time to form a semiconductor layer on the semiconductor substrate. Etch gas is injected to the chamber for the second time to selectively eliminate the semiconductor layer on the insulation layer pattern. Reducing gas is injected to the chamber for the third time to remove the atoms of the etch gas absorbed to the surface of the semiconductor layer remaining on the exposed semiconductor substrate. The processes for sequentially injecting the source gas, the etch gas and the reducing gas are repeated at least twice.
Abstract:
펀치쓰루 억제용 불순물 영역을 갖는 선택 트랜지스터들을 구비하는 낸드형 플래쉬 메모리 소자가 제공된다. 상기 소자는 반도체 기판 내에 형성된 제1 및 제2 불순물 영역들 및 상기 제1 및 제2 불순물 영역들 사이의 상기 반도체 기판 상부에 배치된 제1 및 제2 선택 게이트 패턴들을 구비한다. 상기 제1 및 제2 선택 게이트 패턴들은 각각 상기 제1 및 제2 불순물 영역들에 각각 인접하도록 배치된다. 상기 제1 및 제2 선택 라인들 사이에 복수개의 셀 게이트 패턴들이 배치된다. 상기 반도체 기판 내에 상기 제1 불순물 영역을 둘러싸는 제1 펀치쓰루 억제용 불순물 영역이 제공된다. 상기 제1 펀치쓰루 억제용 불순물 영역은 상기 제1 불순물 영역에 인접한 상기 제1 선택 게이트 패턴의 제1 가장자리와 중첩한다. 상기 반도체 기판 내에 상기 제2 불순물 영역을 둘러싸는 제2 펀치쓰루 억제용 불순물 영역이 제공된다. 상기 제2 펀치쓰루 억제용 불순물 영역은 상기 제2 불순물 영역에 인접한 상기 제2 선택 게이트 패턴의 제1 가장자리와 중첩한다.
Abstract:
A semiconductor device and its forming method are provided to prevent the generation of GIDL(Gate Induced Drain Leakage), to reduce the influence of electric field on a gate electrode, and to keep a threshold voltage in a high level. A semiconductor pin(107) is formed on a semiconductor substrate(101). A gate electrode(123) crosses the semiconductor pin. The gate electrode has surfaces opposite to both sidewalls of the semiconductor pin. A first epitaxial layer(131) is grown from the semiconductor pin of both sides of the gate electrode. A second epitaxial layer(137) is grown from the first epitaxial layer. An ion implantation is performed on the first and second epitaxial layers. An insulating layer is interposed between the first and second epitaxial layers. The insulating layer has an opening portion capable of exposing partially the first epitaxial layer to the outside.