Abstract:
액티브 피팅 불량을 감소시키면서 게이트 전극을 형성하는 방법이 개시되어 있다. 액티브 및 필드 영역이 구분된 반도체 기판상에 게이트 절연막 및 폴리실리콘막을 형성한다. 상기 폴리실리콘막 상에 이온 주입에 의한 폴리실리콘막의 손상을 감소시키는 버퍼막을 형성한다. 상기 버퍼막상의 이온 주입 영역으로 불순물 이온을 주입하여, 상기 폴리실리콘막을 도전성 폴리실리콘막으로 형성한다. 상기 도전성 폴리실리콘막의 소정부위를 순차적으로 식각하여 게이트 전극을 형성한다. 상기 버퍼막에 의해 폴리실리콘막의 손상이 최소화되어 액티브 피팅 불량이 감소된다.
Abstract:
PURPOSE: A method for forming a gate electrode of a semiconductor device and a method for fabricating a non-volatile memory device by using the same are provided to form a gate electrode for reducing a resistant difference between resistances. CONSTITUTION: A conductive layer is formed on a substrate(100). A dielectric layer is formed on the conductive layer. A polysilicon layer is formed on the dielectric layer. A hard mask layer is formed on the polysilicon layer. A hard mask pattern is formed by etching the hard mask. A gate structure is formed by stacking a gate oxide layer pattern, a conductive layer pattern(102a), a dielectric layer pattern(104a), a polysilicon layer pattern(106a), and a hard mask pattern. A low density source/drain region(112) is formed by using the gate structure as an ion implant mask. A gate spacer is formed on a sidewall of the gate structure. An upper face of the polysilicon layer pattern(106a) is exposed by removing the hard mask pattern. The first part of the gate spacer is projected by removing the hard mask pattern. The polysilicon layer pattern(106a) and the second part of the gate spacer(114b) are planarized by removing the first part of the gate spacer. A stopping layer is formed along an upper face of the polysilicon layer pattern(106a), a sidewall of the gate spacer(114b), and a surface of the semiconductor substrate(100). An interlayer dielectric is formed on the whole surface of the above structure. The polysilicon layer pattern(106a) is exposed by performing a planarization process. A gate electrode is formed by depositing a metal silicide layer(120) on an exposed portion of the polysilicon layer pattern(106a).
Abstract:
A chemical mechanical polishing method and a method of fabricating a flash memory device using the same are provided to form an interlayer dielectric, of which a thickness distribution variation is locally small. A substrate(100) including a silicon oxide layer(120) is prepared, in which a first upper portion of the silicon oxide layer is positioned at a first height, and a second upper portion is positioned at a second height lower than the first height. The silicon oxide layer is subjected to chemical mechanical polishing by using a ceria slurry comprising a ceria polishing agent of 0.5 to 3 wt%, an anion surfactant of 0.8 to 2.0 wt%, and water, in which the first upper portion is polished at a first polishing speed, and the second upper portion is polished at a second polishing speed lower than the first polishing speed.
Abstract:
트렌치를 절연물로 채운 반도체 장치의 평탄화를 위한 화학 및 기계적 연마를 실시함에 있어 연마 저지막으로 폴리실리콘을 사용하고, 열산화 공정을 실시하여 트렌치 내벽뿐만아니라 폴리실리콘층 측벽에도 산화막 스페이서를 형성하는 단계와 활성 영역을 오픈하기 위해 폴리실리콘층을 제거할 경우 산화막에 대해 10 내지 20의 선택비를 갖도록 에치백 하는 제 1 단계와 산화막에 대해 50 내지 100 선택비를 갖도록 에치백하는 제 2단계 에치백 공정을 실시하는 단계를 포함하는 소자분리방법이 개시되어, 필드 리세스 마진 확보 및 패드 산화막의 피팅 억제 효과를 얻을 수 있다. 연마 저지막, CMP, 폴리실리콘
Abstract:
Disclosed is a polishing head of a chemical and mechanical polishing apparatus uniformly polishing a wafer. The polishing head has a body defining at least one air passage therein through which air is introduced into and exhausted from the polishing head. The body is movable upward and downward. An air pressure distributing member is mounted to a lower portion of the body for distributing a pressure of the air supplied through the air passage. A membrane is mounted to enclose a lower surface of the air pressure distributing member so as to be expanded and shrunk by the pressure of the air supplied through the air pressure distributing member. A surface of the air pressure distributing member makes contact with a back surface of a wafer. An air pressure compensating member makes uniformly the pressure that is applied to central and edge portions of the wafer which makes contact with the membrane. Since the air pressure compensating member applies to the edge portion of the wafer, the air pressure is compensated so that the uniform air pressure is applied to the wafer. Thus, the wafer is uniformly polished.
Abstract:
A method of fabricating a semiconductor device having a capacitor with a high dielectric constant layer includes a groove for an alignment key is formed together with a contact hole on a substrate; a conductive layer of tungsten is formed to fill the contact hole and cover the inner surface of the groove; a capping layer for use as an oxygen barrier is stacked on the conductive layer of tungsten; a planarization process is performed using CMP to leave the capping layer and the conductive layer of tungsten covering the inner surface of the groove to form a contact plug filling the contact hole; a capacitor bottom electrode layer is stacked to contact the top surface of the contact plug; a high dielectric constant layer is stacked on the bottom electrode layer; and an oxidation treatment is performed at a high temperature to crystallize the high dielectric constant layer.
Abstract:
PURPOSE: A polishing head of a CMP(Chemical Mechanical Polishing) apparatus is provided to polish uniformly a wafer by improving a structure of the polishing head. CONSTITUTION: A surface of a wafer(W) is contacted with a polishing pad. A back face of the wafer(W) is contacted with a polishing head(32). A main body(34) is formed with a housing(36), a base(38), and a retainer ring(40). The base(38) is used for supporting the housing(36). The retainer ring(40) is installed at an edge of a lower portion of the base(38) in order to prevent an escape of the wafer. The housing(36) is connected with a drive portion. The housing(36) has a circular upper face and a circular lower face. The housing(36) includes the first tube(42a). The second and the third tubes(42b,42c) are formed at a predetermined position apart from the first tube(42a). A base(38) is used for supporting the housing(36). The first chamber(44) is formed between the housing(36) and the base(38). A perforate plate(46) is installed at a lower portion of the main body(34). A plurality of through-holes(46a) are formed on the perforate plate(46). A separation plate(48) is formed between the base(38) and the perforate plate(46). An air cushion(50) is installed on an edge portion of the perforate plate(46). A membrane(52) is formed on a lower face of the perforate plate(46).
Abstract:
A method for fabricating a semiconductor memory device is provided to improve uniformity in the thickness of a polysilicon layer and to reduce damages on the polysilicon layer caused by polishing particles by using a chemical mechanical slurry composition having a high polishing rate to a silicon oxide layer, thereby improving the reliability of the semiconductor device. A method for fabricating a semiconductor memory device comprises the steps of: forming a polysilicon pattern(108) on a semiconductor wafer(100); etching the wafer exposed to the polysilicon pattern to form trenches(109) on the wafer; forming a silicon oxide layer covering the polysilicon pattern with the trenches embedded therein; polishing the silicon oxide layer with a chemical mechanical polishing(CMP) slurry composition to expose the polysilicon pattern and to form a separator for a device, wherein the CMP slurry composition comprises 0.1-3.5 wt% of seria as a polishing agent, 0.01-0.10 wt% of a non-ionic surfactant adsorbed on the surface of the polysilicon layer during CMP to form a protective layer, 0.5-3.5 wt% of polyacrylic acid and the balance amount of water; and forming a structure having a gate dielectric and a conductive pattern on the wafer. In the CMP slurry composition, the non-ionic surfactant has a tri-block structure containing a first polyethylene oxide repeating unit, polypropylene oxide repeating unit and a second polyethylene oxide repeating unit, wherein each of the first polyethylene oxide and the second polyethylene oxide has a HLB(hydrophilic lipophilic balance) value of 10-15, and the polypropylene oxide has a HLB value of 28-32.
Abstract:
A method for manufacturing a semiconductor device is provided to reduce the generation of failure and to improve the reliability by restraining the damage of an alignment key. A semiconductor substrate is divided into a memory cell region(C) and a peripheral region(P), wherein the peripheral region. A plurality of predetermined structures with the same height are formed within the memory cell region and peripheral region. At this time, the generation of a stepped portion is restrained at a boundary between the peripheral region and memory cell region. A metal line(225) is formed within the memory cell region and an alignment key(230) is formed within the peripheral region. A stepped portion compensating pad is formed on the substrate when the predetermined structures are formed within the peripheral region.
Abstract:
PURPOSE: A semiconductor device having a planarized insulation layer and a forming method thereof are provided to prevent first and second planarized insulation layers from being damaged by preventing a physical stress from being applied to a stress concentration area of a first insulation layer. CONSTITUTION: A substrate(100) having a first section(A) and a second section(B) adjacent each other. A structure(110) is formed on the top of the substrate within the first section. A first insulation layer is formed on the substrate having the structure. The first insulation layer comprises a first top surface, an inclined side wall(130S), and a second top surface(130TB). A second insulation layer is formed on the first insulation layer.