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    • 1. 发明授权
    • Method for making a trench isolation having a conformal liner oxide and
top and bottom rounded corners for integrated circuits
    • 用于制造具有保形衬垫氧化物的沟槽隔离和用于集成电路的顶部和底部圆角的方法
    • US06110793A
    • 2000-08-29
    • US104033
    • 1998-06-24
    • Kuei-Ying LeeKong-Beng TheiBou-Fun Chen
    • Kuei-Ying LeeKong-Beng TheiBou-Fun Chen
    • H01L21/762H01L21/76
    • H01L21/76235
    • A method for forming an improved trench isolation having a conformal liner oxide and rounded top and bottom corners in the trench was achieved. The conformal liner oxide improves the CVD gap-filling capabilities for these deep submicron wide trenches, and the rounded corners improve the electrical characteristics of the devices in the adjacent device areas. After etching trenches with vertical sidewalls in the silicon substrate, a two-step oxidation process is used to form the conformal liner oxide. A first oxidation step using a low-oxygen flow rate and a low temperature (about 850 to 920.degree. C.) is used to achieve rounded bottom corners. A second oxidation step at a low-oxygen flow rate and a higher temperature (about 1000 to 1150.degree. C.) is used to achieve rounded top corners. The two-step process also results in a more conformal liner oxide. The trenches are then filled with a CVD oxide and polished or etched back to an oxidation-barrier layer/etch-stop layer over the device areas to complete the trench isolation.
    • 实现了在沟槽中形成具有共形衬垫氧化物和圆形顶部和底部角的改进的沟槽隔离的方法。 保形衬垫氧化物改善了这些深亚微米宽沟槽的CVD间隙填充能力,并且圆角提高了相邻器件区域中器件的电气特性。 在硅衬底中用垂直侧壁蚀刻沟槽之后,使用两步氧化工艺来形成保形衬里氧化物。 使用低氧气流速度和低温(约850-920℃)的第一氧化步骤来实现圆角的底角。 使用低氧流速和较高温度(约1000至1150℃)的第二氧化步骤来实现圆角顶角。 两步法也导致更适形的衬里氧化物。 然后用CVD氧化物填充沟槽并在器件区域上抛光或蚀刻回到氧化阻挡层/蚀刻停止层以完成沟槽隔离。
    • 2. 发明授权
    • Method to reduce defects in shallow trench isolations by post liner anneal
    • 通过后衬板退火来减少浅沟槽隔离缺陷的方法
    • US06350662B1
    • 2002-02-26
    • US09357244
    • 1999-07-19
    • Kong-Beng TheiKuei-Ying LeeDun-Nian YaungShou-Gwo Wuu
    • Kong-Beng TheiKuei-Ying LeeDun-Nian YaungShou-Gwo Wuu
    • H01L2176
    • H01L21/76224
    • A method to form shallow trench isolations with reduced substrate defects by using a nitrogen anneal is achieved. A silicon substrate is provided. The silicon substrate is etched where not protected by a photoresist mask to form shallow trenches where shallow trench isolations are planned. A liner oxide layer is grown on the interior surfaces of the shallow trenches. The silicon substrate and the liner oxide layer are annealed to reduce or eliminate defects, dislocations, interface traps, and stress in the silicon substrate. An isolation oxide layer is deposited overlying the liner oxide layer and completely filling the shallow trenches. The isolation oxide layer is etched down to the top surface of the silicon substrate and thereby forms the shallow trench isolations. The integrated circuit device is completed.
    • 实现了通过使用氮退火形成具有减少的衬底缺陷的浅沟槽隔离的方法。 提供硅衬底。 蚀刻硅衬底,其中未被光致抗蚀剂掩模保护以形成浅沟槽,其中规划浅沟槽隔离。 在浅沟槽的内表面上生长衬里氧化物层。 对硅衬底和衬里氧化物层进行退火以减少或消除硅衬底中的缺陷,位错,界面陷阱和应力。 隔离氧化物层沉积在衬垫氧化物层上并且完全填充浅沟槽。 隔离氧化物层被蚀刻到硅衬底的顶表面,从而形成浅沟槽隔离。 集成电路装置完成。