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    • 2. 发明授权
    • Rough oxide hard mask for DT surface area enhancement for DT DRAM
    • 用于DT DRAM的DT表面积增强的粗糙氧化物硬掩模
    • US06559002B1
    • 2003-05-06
    • US10032041
    • 2001-12-31
    • Stephan KudelkaHelmut Horst TewsStephen RahnIrene McStayUwe Schroeder
    • Stephan KudelkaHelmut Horst TewsStephen RahnIrene McStayUwe Schroeder
    • H01L218242
    • H01L27/1087H01L21/0337H01L21/3086H01L21/31144H01L21/32139H01L28/84Y10S438/964
    • In a process for making a DT DRAM structure, the improvement of providing a surface area enhanced DT below the collar region and node capacitance that does not shrink with decreasing groundrule/cell size, comprising: a) providing a semiconductor substrate having a collar region and an adjacent region below the collar region, the collar region having SiO deposited thereon; b) depositing a SiN liner on said collar region and on the region below the collar; c) depositing a layer of a-Si on the SiN liner to form a micromask; d) subjecting the structure from step c) to an anneal/oxidation step under a wet environment at a sufficient temperature to form a plurality of oxide dot hardmasks; e) subjecting the SiN liner to an etch selective to SiO; f) subjecting the structure from step e) to a Si transfer etch using a chemical dry etch (CDE) selective to SiO to create rough Si surface; g) stripping SiO and the SiN; and forming a node and collar deposition.
    • 在制造DT DRAM结构的过程中,提高在轴环区域之下提供的表面积增强的DT和不随着降低的底层/单元尺寸而缩小的节点电容,包括:a)提供具有轴环区域和 在轴环区域下方的相邻区域,其上沉积有SiO的轴环区域; b)在所述轴环区域和轴环下方的区域上沉积SiN衬垫; c)在SiN衬套上沉积a-Si层以形成 微型掩模; d)使所述步骤c)的结构在潮湿环境下在足够的温度下进行退火/氧化步骤,以形成多个氧化物点硬掩模; e)使所述SiN衬底对SiO选择性蚀刻; f) 使用对SiO选择性的化学干蚀刻(CDE)来产生粗糙的Si表面的步骤e)到Si转移蚀刻的结构; g)剥离SiO和SiN; 并形成一个节点和项圈沉积。
    • 4. 发明授权
    • Semiconductor structures and manufacturing methods
    • 半导体结构及制造方法
    • US06605860B1
    • 2003-08-12
    • US09597442
    • 2000-06-20
    • Helmut Horst TewsAlexander MichaelisStephan KudelkaUwe SchroederRaj JammyUlrike Gruening
    • Helmut Horst TewsAlexander MichaelisStephan KudelkaUwe SchroederRaj JammyUlrike Gruening
    • H01L2906
    • H01L21/28202H01L21/02164H01L21/0217H01L21/0223H01L21/02238H01L21/02247H01L21/02255H01L21/2822H01L21/3144H01L21/31658H01L27/10864H01L29/045H01L29/42368H01L29/512H01L29/513H01L29/518H01L29/66666H01L29/7827Y10S257/905
    • A method for forming substantially uniformly thick, thermally grown, silicon dioxide material on a silicon body independent of bon axis. A trench is formed in a surface of the silicon body, such trench having sidewalls disposed in different crystallographic planes, one of such planes being the crystallographic plane and another one of such planes being the plane. A substantially uniform layer of silicon nitride is formed on the sidewalls. The trench, with the with substantially uniform layer of silicon nitride, is subjected to a silicon oxidation environment with sidewalls in the plane being oxidized at a higher rate than sidewalls in the plane producing silicon dioxide on the silicon nitride layer having thickness over the plane greater than over the plane. The silicon dioxide is subjected to an etch to selectively remove silicon dioxide while leaving substantially un-etched silicon nitride to thereby remove portions of the silicon dioxide over the plane and to thereby expose underlying portions of the silicon nitride material while leaving portions of the silicon dioxide over the plane on underlying portions of the silicon nitride material. Exposed portions of the silicon nitride material are selectively removed to expose underlying portions of the sidewalls of the trench disposed in the plane while leaving substantially un-etched portions of the silicon nitride material disposed on sidewalls of the trench disposed in the plane. The structure is then subjected to an silicon oxidation environment to produce the substantially uniform silicon dioxide layer on the sidewalls of the trench.
    • 一种在硅主体上形成基本上均匀的厚的热生长二氧化硅材料的方法,其独立于凸轮轴。 沟槽形成在硅体的表面中,这样的沟槽具有设置在不同结晶平面中的侧壁,这些平面中的一个是100晶体平面,另外一个这样的平面是“10”平面。 在侧壁上形成基本均匀的氮化硅层。 具有基本上均匀的氮化硅层的沟槽经受硅氧化环境,其中<110>面中的侧壁以比在100平面中的侧壁更高的速率被氧化,在氮化硅层上产生二氧化硅 具有比<110>平面上的厚度大于超过<100>平面的厚度。 对二氧化硅进行蚀刻以选择性地去除二氧化硅,同时留下基本未蚀刻的氮化硅,从而在<100>平面上除去二氧化硅的一部分,从而暴露氮化硅材料的下面部分,同时留下部分 在氮化硅材料的下面部分上的<110>面上的二氧化硅。 选择性地去除氮化硅材料的暴露部分以暴露设置在<100>平面中的沟槽的侧壁的下面部分,同时留下设置在设置在<110>平面中的沟槽的侧壁上的氮化硅材料的基本上未蚀刻的部分 >飞机。 然后将该结构进行硅氧化环境以在沟槽的侧壁上产生基本均匀的二氧化硅层。
    • 5. 发明授权
    • Method of forming a vertically oriented device in an integrated circuit
    • 在集成电路中形成垂直取向器件的方法
    • US06426253B1
    • 2002-07-30
    • US09576465
    • 2000-05-23
    • Helmut Horst TewsAlexander MichaelisBrian S. LeeUwe SchroederStephan Kudelka
    • Helmut Horst TewsAlexander MichaelisBrian S. LeeUwe SchroederStephan Kudelka
    • H01L218242
    • H01L27/10864H01L21/76237H01L21/823487H01L27/10841H01L27/10867
    • A system and method of forming an electrical connection (142) to the interior of a deep trench (104) in an integrated circuit utilizing a low-angle dopant implantation (114) to create a self-aligned mask over the trench. The electrical connection preferably connects the interior plate (110) of a trench capacitor to a terminal of a vertical trench transistor. The low-angle implantation process, in combination with a low-aspect ratio mask structure, generally enables the doping of only a portion of a material overlying or in the trench. The material may then be subjected to a process step, such as oxidation, with selectivity between the doped and undoped regions. Another process step, such as an etch process, may then be used to remove a portion of the material (120) overlying or in the trench, leaving a self-aligned mask (122) covering a portion of the trench, and the remainder of the trench exposed for further processing. Alternatively, an etch process alone, with selectivity between the doped and undoped regions, may be used to create the mask. The self-aligned mask then allows for the removal of selective portions of the materials in the trench so that a vertical trench transistor and a buried strap may be formed on only one side of the trench.
    • 使用低角度掺杂剂注入(114)在集成电路中形成到深沟槽(104)的内部的电连接(142)的系统和方法,以在沟槽上产生自对准掩模。 电连接优选地将沟槽电容器的内板(110)连接到垂直沟槽晶体管的端子。 低角度注入工艺与低纵横比掩模结构相结合,通常能够仅掺杂覆盖或在沟槽中的材料的一部分。 然后可以在掺杂区域和未掺杂区域之间选择性地对材料进行处理步骤,例如氧化。 然后可以使用诸如蚀刻工艺的另一工艺步骤来去除覆盖在沟槽中或在沟槽中的部分材料(120),留下覆盖沟槽的一部分的自对准掩模(122),并且其余部分 沟槽暴露进一步加工。 或者,可以使用仅在掺杂区域和未掺杂区域之间具有选择性的蚀刻工艺来产生掩模。 自对准掩模然后允许去除沟槽中的材料的选择性部分,使得可以仅在沟槽的一侧上形成垂直沟槽晶体管和掩埋带。
    • 6. 发明授权
    • Integrated circuit vertical trench device and method of forming thereof
    • 集成电路垂直沟槽器件及其形成方法
    • US06335247B1
    • 2002-01-01
    • US09597389
    • 2000-06-19
    • Helmut Horst TewsAlexander MichaelisStephan KudelkaUwe SchroederBrian S. Lee
    • Helmut Horst TewsAlexander MichaelisStephan KudelkaUwe SchroederBrian S. Lee
    • H01L21336
    • H01L27/10864H01L27/10876
    • A method of forming a vertically-oriented device in an integrated circuit using a selective wet etch to remove only a part of the sidewalls in a deep trench, and the device formed therefrom. While a portion of the trench perimeter (e.g., isolation collar 304) is protected by a mask (e.g., polysilicon 318), the exposed portion is selectively wet etched to remove selected crystal planes from the exposed portion of the trench, leaving a flat substrate sidewall (324) with a single crystal plane. A single side vertical trench transistor may be formed on the flat sidewall. A vertical gate oxide (e.g. silicon dioxide 330) of the transistor formed on the single crystal plane is substantially uniform across the transistor channel, providing reduced chance of leakage and consistent threshold voltages from device to device. In addition, trench widening is substantially reduced, increasing the device to device isolation distance in a single sided buried strap junction device layout.
    • 一种使用选择性湿蚀刻在集成电路中形成垂直取向器件的方法,以仅去除深沟槽中的一部分侧壁,以及由此形成的器件。 虽然沟槽周边的一部分(例如,隔离环304)被掩模(例如,多晶硅318)保护,但是暴露部分被选择性地湿蚀刻以从沟槽的暴露部分移除所选择的晶面,留下平坦的衬底 侧壁(324)与单晶面。 单侧垂直沟槽晶体管可以形成在平坦侧壁上。 形成在单晶平面上的晶体管的垂直栅极氧化物(例如二氧化硅330)在晶体管沟道上基本上是均匀的,从而降低了泄漏的机会和从器件到器件的一致的阈值电压。 此外,沟槽加宽大大降低,从而在单面掩埋带接合器件布局中将器件增加到器件隔离距离。
    • 7. 发明授权
    • Semiconductor structures and manufacturing methods
    • 半导体结构及制造方法
    • US06740555B1
    • 2004-05-25
    • US09408248
    • 1999-09-29
    • Helmut Horst TewsAlexander MichaelisStephan KudelkaUwe SchroederRaj JammyUlrike Gruening
    • Helmut Horst TewsAlexander MichaelisStephan KudelkaUwe SchroederRaj JammyUlrike Gruening
    • H01L218242
    • H01L21/28202H01L21/02164H01L21/0217H01L21/0223H01L21/02238H01L21/02247H01L21/02255H01L21/2822H01L21/3144H01L21/31658H01L27/10864H01L29/045H01L29/42368H01L29/512H01L29/513H01L29/518H01L29/66666H01L29/7827Y10S257/905
    • A method for forming substantially uniformly thick, thermally grown, silicon dioxide material on a silicon body independent of axis. A trench is formed in a surface of the silicon body, such trench having sidewalls disposed in different crystallographic planes, one of such planes being the crystallographic plane and another one of such planes being the plane. A substantially uniform layer of silicon nitride is formed on the sidewalls. The trench, with the substantially uniform layer of silicon nitride, is subjected to a silicon oxidation environment with sidewalls in the plane being oxidized at a higher rate than sidewalls in the plane producing silicon dioxide on the silicon nitride layer having thickness over the plane greater than over the plane. The silicon dioxide is subjected to an etch to selectively remove silicon dioxide while leaving substantially un-etched silicon nitride to thereby remove portions of the silicon dioxide over the plane and to thereby expose underlying portions of the silicon nitride material while leaving portions of the silicon dioxide over the plane on underlying portions of the silicon nitride material. Exposed portions of the silicon nitride material are selectively removed to expose underlying portions of the sidewalls of the trench disposed in the plane while leaving substantially un-etched portions of the silicon nitride material disposed on sidewalls of the trench disposed in the plane. The structure is then subjected to an silicon oxidation environment to produce the substantially uniform silicon dioxide layer on the sidewalls of the trench.
    • 一种用于在独立于轴的硅体上形成基本上均匀的厚的,热生长的二氧化硅材料的方法。 沟槽形成在硅体的表面中,这种沟槽具有设置在不同结晶平面内的侧壁,其中一个这样的平面是<100>结晶平面,另外一个这样的平面是<110>平面。 在侧壁上形成基本均匀的氮化硅层。 具有基本上均匀的氮化硅层的沟槽经受硅氧化环境,其中<110>面中的侧壁以比在100平面中的侧壁更高的速率被氧化,在氮化硅层上产生二氧化硅, 厚度大于<100>平面上的厚度。 对二氧化硅进行蚀刻以选择性地去除二氧化硅,同时留下基本未蚀刻的氮化硅,从而在<100>平面上除去二氧化硅的一部分,从而暴露氮化硅材料的下面部分,同时留下部分 在氮化硅材料的下面部分上的<110>面上的二氧化硅。 选择性地去除氮化硅材料的暴露部分以暴露设置在<100>平面中的沟槽的侧壁的下面部分,同时留下设置在设置在<110>平面中的沟槽的侧壁上的氮化硅材料的基本上未蚀刻的部分 >飞机。 然后将该结构进行硅氧化环境以在沟槽的侧壁上产生基本均匀的二氧化硅层。