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    • 1. 发明授权
    • Method for uniformly doping hemispherical grain polycrystalline silicon
    • 均匀掺杂半球状晶粒多晶硅的方法
    • US5885869A
    • 1999-03-23
    • US528183
    • 1995-09-14
    • Charles TurnerRandhir P. S. Thakur
    • Charles TurnerRandhir P. S. Thakur
    • H01L21/22H01L21/02H01L21/3215H01L21/334H01L21/822H01L21/8242H01L27/04H01L27/10H01L27/108H01L21/20
    • H01L28/84H01L21/32155H01L27/10808H01L29/66181Y10S148/014Y10S148/122Y10S148/138
    • A method is disclosed for uniformly doping HSG polycrystalline silicon independent of the other layers of the semiconductor substrate. A semiconductor substrate having a silicon dioxide layer formed superjacent a polysilicon layer is provided in a chamber. A doped rough silicon layer is formed in situ superjacent the silicon dioxide layer. This is accomplished by depositing the silicon layer superjacent the silicon dioxide layer and exposing the silicon layer to a source gas, a dopant gas, and energy, preferably in situ to thereby form uniformly doped silicon layer and roughened polysilicon layer using rapid thermal chemical vapor deposition techniques or low pressure chemical vapor deposition.Alternatively, a uniformly doped roughened polysilicon layer is formed superjacent the silicon dioxide layer in situ. This formation is achieved by depositing an amorphous silicon layer superjacent the silicon dioxide layer and roughening the amorphous silicon layer in situ. The step of roughening is achieved by vacuum annealing the amorphous silicon layer using rapid thermal chemical vapor deposition techniques or low pressure chemical vapor deposition. The roughened amorphous silicon layer is doped by exposing to a source gas, a dopant gas and energy.
    • 公开了与半导体衬底的其他层无关的均匀掺杂HSG多晶硅的方法。 具有在多晶硅层之上形成的二氧化硅层的半导体衬底设置在室中。 掺杂的粗硅层原位形成在二氧化硅层的上方。 这是通过沉积超过二氧化硅层的硅层并将硅层暴露于源气体,掺杂剂气体和能量,优选在原位,由此形成均匀掺杂的硅层和使用快速热化学气相沉积的粗糙多晶硅层 技术或低压化学气相沉积。 或者,原位形成在二氧化硅层之上的均匀掺杂的粗糙多晶硅层。 通过沉积位于二氧化硅层之上的非晶硅层并原位粗化非晶硅层来实现该形成。 通过使用快速热化学气相沉积技术或低压化学气相沉积对非晶硅层进行真空退火来实现粗糙化的步骤。 粗糙化的非晶硅层通过暴露于源气体,掺杂剂气体和能量而被掺杂。
    • 3. 发明授权
    • Semiconductor processing method of providing a conductively doped layer
of hemispherical grain polysilicon
    • 提供半导体晶粒多晶硅的导电掺杂层的半导体加工方法
    • US5639685A
    • 1997-06-17
    • US539851
    • 1995-10-06
    • John K. ZahurakKlaus F. SchuegrafRandhir P. S. Thakur
    • John K. ZahurakKlaus F. SchuegrafRandhir P. S. Thakur
    • H01L21/02H01L21/70
    • H01L28/84Y10S148/138
    • A semiconductor processing method of providing a conductively doped layer of hemispherical grain polysilicon over a substrate includes, a) providing a layer of conductively doped silicon over the substrate to a thickness greater than about 200 Angstroms; b) depositing an undoped layer of non-polycrystalline silicon over the doped silicon layer to a thickness of from 100 Angstroms to about 400 Angstroms; c) positioning the substrate with the doped silicon and undoped non-polycrystalline silicon layers within a chemical vapor deposition reactor; d) with the substrate therein, lowering pressure within the chemical vapor deposition reactor to a first pressure at or below about 200 mTorr; e) with the substrate therein, raising pressure within the chemical vapor deposition reactor from the first pressure and flushing the reactor with a purging gas; f) with the substrate therein ceasing flow of the purging gas and lowering pressure within the chemical vapor deposition reactor to a second pressure at or below about 200 mTorr; and g) annealing the substrate having the deposited non-polycrystalline silicon layer in the presence of a conductivity enhancing impurity gas at an annealing temperature of from about 350.degree. C. to about 600.degree. C. and at an annealing pressure of from about 10.sup.-4 Torr to about 80 Torr to in situ both diffuse conductivity enhancing impurity into the non-polycrystalline silicon layer and transform the non-polycrystalline silicon layer into a conductively doped hemispherical grain polysilicon layer.
    • 在衬底上提供半球形晶粒多晶硅的导电掺杂层的半导体处理方法包括:a)在衬底上提供厚度大于约200埃的导电掺杂硅层; b)在掺杂硅层上沉积未掺杂的非多晶硅层至厚度为100埃至约400埃; c)将衬底与掺杂的硅和未掺杂的非多晶硅层定位在化学气相沉积反应器内; d)与其中的基底,将化学气相沉积反应器内的压力降低到等于或低于约200mTorr的第一压力; e)与其中的基板,从第一压力升高化学气相沉积反应器内的压力并用净化气体冲洗反应器; f)其中衬底在其中停止清洗气体的流动并且将化学气相沉积反应器内的压力降低至等于或低于约200mTorr的第二压力; 以及g)在约350℃至约600℃的退火温度和约10℃的退火温度下,在导电性增强杂质气体存在下退火具有沉积的非多晶硅层的衬底, 4乇至约80乇原位扩散导电性增强杂质进入非多晶硅层,并将非多晶硅层转变为导电掺杂半球形晶粒多晶硅层。
    • 8. 发明授权
    • Method of forming rough polysilicon surfaces
    • 形成粗多晶硅表面的方法
    • US5877063A
    • 1999-03-02
    • US502906
    • 1995-07-17
    • Robin Lee Gilchrist
    • Robin Lee Gilchrist
    • H01L21/02H01L21/20
    • H01L28/82Y10S148/138
    • A semiconductor processing method of providing a polysilicon film having induced outer surface roughness includes, a) providing a polysilicon layer over a substrate, the polysilicon layer having an outer surface of a first degree of roughness; b) providing a layer of a refractory metal silicide over the outer surface of the polysilicon layer, the refractory metal silicide preferably being WSi.sub.x where "x" is initially from 1.0 to 2.5, the WSi.sub.x layer and the polysilicon layer outer surface defining a first interface therebetween; c) annealing the substrate at a temperature and for a time period which are effective to transform the WSi.sub.x into a tetragonal crystalline structure and to transform the first interface into a different second interface, the WSi.sub.x layer not being in a tetragonal crystalline state prior to the anneal, the WSi.sub.x at the second interface having an increased value of "x" from the initial value of "x"; and d) etching the WSi.sub.x layer from the polysilicon layer at least to the second interface to leave an outer polysilicon surface having a second degree of roughness, the second degree of roughness being greater than the first degree of roughness. A capacitor having a conductive plate comprising a polysilicon film produced by the process is also disclosed.
    • 提供具有诱导外表面粗糙度的多晶硅膜的半导体处理方法包括:a)在衬底上提供多晶硅层,所述多晶硅层具有第一粗糙度的外表面; b)在多晶硅层的外表面上提供难熔金属硅化物层,难熔金属硅化物优选为WSix,其中“x”最初为1.0至2.5,所述WSix层和多晶硅层外表面限定第一界面 之间; c)在有效将WSix转变成四方晶体结构并将第一界面转变成不同的第二界面的温度和时间段退火衬底,WSix层在第四界面之前不处于四方晶状态 在第二接口处的WSix与初始值“x”具有增加的值“x”; 以及d)至少将所述WSix层从所述多晶硅层蚀刻到所述第二界面以留下具有第二程度粗糙度的外多晶硅表面,所述第二粗糙度大于所述第一粗糙度。 还公开了一种具有包括通过该工艺生产的多晶硅膜的导电板的电容器。