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    • 1. 发明授权
    • Plasma processing method and plasma etching method
    • 等离子体处理方法和等离子体蚀刻方法
    • US5716534A
    • 1998-02-10
    • US564621
    • 1995-11-29
    • Hiroshi TsuchiyaYoshio FukasawaShuji MochizukiYukio NaitoKosuke Imafuku
    • Hiroshi TsuchiyaYoshio FukasawaShuji MochizukiYukio NaitoKosuke Imafuku
    • H01J37/32H01L21/00
    • H01J37/32082H01J37/32165H01J37/3299H01J2237/3343
    • A plasma etching apparatus includes a process chamber that can be set at a reduced pressure. A lower electrode on which a semiconductor wafer is placed and an upper electrode opposing the lower electrode are disposed in the process chamber. The lower and upper electrodes are connected to RF power supplies, respectively. First and second RF powers, the phases and power ratio of which are separately controlled, can be applied to the upper and lower electrodes. Parameters including the frequencies, power values, and relative phases of the first and second RF powers are selected in order to set the etching characteristics, e.g., an etching rate, the planar uniformity of the etching rate, the etching selectivity ratio and the like to predetermined values. During etching, the first and second RF powers are monitored by separate detectors, and are maintained at initial preset values through a controller.
    • 等离子体蚀刻装置包括能够减压设置的处理室。 在其中放置半导体晶片的下电极和与下电极相对的上电极设置在处理室中。 下电极和上电极分别连接到RF电源。 第一和第二RF功率(其相位和功率比被单独控制)可以应用于上电极和下电极。 选择包括第一和第二RF功率的频率,功率值和相对相位的参数,以便将蚀刻特性,例如蚀刻速率,蚀刻速率的平面均匀性,蚀刻选择比等设置为 预定值。 在蚀刻期间,第一和第二RF功率由分离的检测器监测,并通过控制器保持在初始预设值。
    • 5. 发明授权
    • Dry etching polysilicon using a bromine-containing gas
    • 使用含溴气体干蚀刻多晶硅
    • US5314573A
    • 1994-05-24
    • US885855
    • 1992-05-20
    • Fumihiko HiguchiYoshio Fukasawa
    • Fumihiko HiguchiYoshio Fukasawa
    • H01L21/3213H01L21/306B44C1/22
    • H01L21/32137
    • The present invention provides a dry etching method for achieving a satisfactory anisotropic etching of, for example, a semiconductor wafer, particularly, a polysilicon layer formed on the wafer. In the present invention, a mixed gas comprising a first gas containing Br and a second gas containing a halogen element other than Br, e.g., a mixed gas consisting of a HBr gas and a HCl gas, is introduced into a vacuum chamber. The mixed gas is converted into plasma by applying a high frequency power to an upper electrode 5. The plasma region is irradiated, as desired, with an ultraviolet light. The semiconductor wafer is etched with the plasma. The etching is carried out under optimum conditions. For example, the surface temperature of the semiconductor wafer, i.e., workpiece, is maintained at a level falling within a range of between 70.degree. C. and 120.degree. C. Also, the flow rate ratio of the mixed gas is suitably controlled.
    • 本发明提供了一种用于实现例如半导体晶片,特别是形成在晶片上的多晶硅层的令人满意的各向异性蚀刻的干蚀刻方法。 在本发明中,将包含Br的第一气体和含有Br以外的卤素元素的第二气体(例如由HBr气体和HCl气体构成的混合气体)的混合气体引入真空室。 通过向上电极5施加高频电力,将混合气体转换为等离子体。根据需要用紫外线照射等离子体区域。 用等离子体蚀刻半导体晶片。 蚀刻在最佳条件下进行。 例如,半导体晶片即工件的表面温度保持在70℃〜120℃的范围内,适当地控制混合气体的流量比。