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    • 3. 发明授权
    • Method of achieving top rounding and uniform etch depths while etching shallow trench isolation features
    • 在蚀刻浅沟槽隔离特征的同时实现顶部圆整和均匀蚀刻深度的方法
    • US06218309B1
    • 2001-04-17
    • US09410365
    • 1999-09-30
    • Alan J. MillerVahid Vahedi
    • Alan J. MillerVahid Vahedi
    • H01L21311
    • H01L21/3065H01L21/76229H01L21/76232
    • A method of etching a trench in a silicon layer is disclosed. The silicon layer is disposed below a hard mask layer having a plurality of patterned openings. The etching takes place in a plasma processing chamber. The method includes flowing a first etchant source gas into the plasma processing chamber, forming a first plasma from the first etchant source gas and etching through a first portion of the silicon layer with the first plasma at a first etch rate. The first etch rate being sufficiently slow to form an effective top-rounded attribute in a portion of the trench. The method further includes flowing a second etchant source gas into the plasma processing chamber, forming a second plasma from the second etchant source gas and etching through a second portion of the silicon layer with the second plasma, wherein the etching with the second plasma extends the trench into the silicon layer without unduly damaging the top rounded attribute.
    • 公开了一种在硅层中蚀刻沟槽的方法。 硅层设置在具有多个图案化开口的硬掩模层的下方。 蚀刻发生在等离子体处理室中。 该方法包括将第一蚀刻剂源气体流入等离子体处理室,从第一蚀刻剂源气体形成第一等离子体,并以第一蚀刻速率用第一等离子体蚀刻硅层的第一部分。 第一蚀刻速率足够慢以在沟槽的一部分中形成有效的顶圆属性。 该方法还包括使第二蚀刻剂源气体流入等离子体处理室,从第二蚀刻剂源气体形成第二等离子体,并用第二等离子体蚀刻硅层的第二部分,其中用第二等离子体进行的蚀刻将 沟槽进入硅层,而不会不适当地损坏顶部圆形属性。
    • 4. 发明授权
    • Apparatus and method for controlling etch depth
    • 用于控制蚀刻深度的装置和方法
    • US06939811B2
    • 2005-09-06
    • US10256251
    • 2002-09-25
    • Tom A. KampAlan J. MillerVijayakumar C. Venugopal
    • Tom A. KampAlan J. MillerVijayakumar C. Venugopal
    • H01L21/00H01L21/3065H01L21/302
    • H01L21/67253H01J37/321H01J37/32963H01L21/3065H01L21/67069
    • An apparatus and method for etching a feature in a wafer with improved depth control and reproducibility is described. The feature is etched at a first etching rate and then at a second etching rate, which is slower than the first etching rate. An optical end point device is used to determine the etching depth and etching is stopped so that the feature has the desired depth. Two different etching rates provides high throughput with good depth control and reproducibility. The apparatus includes an etching tool in which a chuck holds the wafer to be etched. An optical end point device is positioned to measure the feature etch depth. An electronic controller communicates with the optical end point device and the etching tool to control the tool to reduce the etch rate part way through etching the feature and to stop the etching tool, so that that the feature is etched to the desired depth.
    • 描述了一种用于蚀刻具有改进的深度控制和再现性的晶片中的特征的装置和方法。 以第一蚀刻速率蚀刻该特征,然后以比第一蚀刻速率慢的第二蚀刻速率蚀刻该特征。 使用光学终点装置来确定蚀刻深度并停止蚀刻,使得特征具有期望的深度。 两种不同的蚀刻速率提供了高吞吐量,具有良好的深度控制和重现性。 该装置包括蚀刻工具,其中卡盘夹持待蚀刻的晶片。 定位光学终点装置以测量特征蚀刻深度。 电子控制器与光学终点装置和蚀刻工具通信以控制工具,以通过蚀刻特征来减少蚀刻速率,并停止蚀刻工具,使得该特征被蚀刻到期望的深度。
    • 8. 发明授权
    • Method of improving the profile angle between narrow and wide features
    • 改善窄宽特征之间轮廓角度的方法
    • US06432832B1
    • 2002-08-13
    • US09346562
    • 1999-06-30
    • Alan J. MillerYosias Melaku
    • Alan J. MillerYosias Melaku
    • H01L2176
    • H01L21/76232H01L21/3065H01L21/31116H01L21/76229Y10S438/978
    • A method of performing a shallow trench isolation etch in a silicon layer of a layer stack is disclosed. The layer stack includes a silicon layer being disposed below a pad oxide layer, the pad oxide being disposed below a nitride layer, and the nitride layer being disposed below a photoresist mask. The etching takes place in a plasma processing chamber. The method includes flowing a first etchant source gas into the plasma processing chamber, forming a first plasma from the first etchant source gas, and etching through the nitride layer with the first plasma. The method further includes flowing a second etchant source gas into the plasma processing chamber, forming a second plasma from the second etchant source gas, and substantially removing the photoresist mask with the second plasma, wherein a substantial portion of the photoresist mask is removed from above the nitride layer before the silicon layer. The method additionally includes flowing a third etchant source gas into the plasma processing chamber, forming a third plasma from the third etchant source gas, and etching through the pad oxide layer and substantially stopping on the silicon layer. The method also includes flowing a fourth etchant source gas into the plasma processing chamber, forming a fourth plasma from the fourth etchant source gas, and etching through the silicon layer with the fourth plasma, the etching forming a narrow feature and a wide feature in the silicon layer, and wherein a first profile angle of the narrow feature is substantially equal to a second profile angle of the wide feature.
    • 公开了一种在层叠层的硅层中进行浅沟槽隔离蚀刻的方法。 所述层叠层包括设置在焊盘氧化物层下方的硅层,所述焊盘氧化物设置在氮化物层下方,并且所述氮化物层设置在光致抗蚀剂掩模下方。 蚀刻发生在等离子体处理室中。 该方法包括将第一蚀刻剂源气体流入等离子体处理室,从第一蚀刻剂源气体形成第一等离子体,并用第一等离子体蚀刻通过氮化物层。 该方法还包括使第二蚀刻剂源气体流入等离子体处理室,从第二蚀刻剂源气体形成第二等离子体,并用第二等离子体基本上去除光致抗蚀剂掩模,其中光致抗蚀剂掩模的大部分从上面去除 在硅层之前的氮化物层。 该方法还包括将第三蚀刻剂源气体流入等离子体处理室,从第三蚀刻剂源气体形成第三等离子体,以及蚀刻通过焊盘氧化物层并基本停止在硅层上。 该方法还包括将第四蚀刻剂源气体流入等离子体处理室,从第四蚀刻剂源气体形成第四等离子体,并用第四等离子体蚀刻穿过硅层,蚀刻形成窄特征,并且在 硅层,并且其中窄特征的第一轮廓角基本上等于宽特征的第二轮廓角。