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    • 4. 发明授权
    • Etching method having high silicon-to-photoresist selectivity
    • 具有高硅 - 光致抗蚀剂选择性的蚀刻方法
    • US06921723B1
    • 2005-07-26
    • US10128907
    • 2002-04-23
    • Yung-Hee Yvette LeeShashank Deshmukh
    • Yung-Hee Yvette LeeShashank Deshmukh
    • H01L21/28H01L21/302H01L21/3213
    • H01L21/32137H01L21/28123
    • Conventional methods of semiconductor fabrication and processing typically utilize three gas (e.g., HBr, Cl2 and O2) and four gas (e.g., HBr, Cl2, O2 and CF4) chemistries to perform gate etching in plasma process chambers. However, the silicon to resist selectivity achieved by these chemistries is limited to about 3:1. The present invention concerns a plasma source gas comprising SF6 and one or more fluorine-containing gases selected from C3F6, C4F8, C5F8, CH2F2, CHF3, and C4F6 (e.g., SF6 and C4F8), allowing the use of a two gas etch chemistry that provides enhanced silicon to photoresist selectivity in gate etching processes.
    • 半导体制造和处理的常规方法通常使用三种气体(例如,HBr,Cl 2 O 2和O 2 2)和四种气体(例如,HBr,Cl 2, / SUB>,O 2和CF 4)化学,以在等离子体处理室中进行栅极蚀刻。 然而,通过这些化学物质实现的抵抗选择性的硅被限制在约3:1。 本发明涉及一种等离子体源气体,其包括SF 6和一种或多种选自C 3 F 6 N,C C 12的含氟气体 8,C 5,C 5,F 5,C 2,F 2, CH 3,CH 3,和C 4 F 6(例如,SF 6和C 6) 允许使用在栅极蚀刻工艺中提供增强的硅到光致抗蚀剂选择性的两种气体蚀刻化学物质。
    • 5. 发明授权
    • Low energy spread ion source with a coaxial magnetic filter
    • 具有同轴磁性过滤器的低能量扩散离子源
    • US6094012A
    • 2000-07-25
    • US187540
    • 1998-11-06
    • Ka-Ngo LeungYung-Hee Yvette Lee
    • Ka-Ngo LeungYung-Hee Yvette Lee
    • H01J27/18H01J27/02
    • H01J27/18
    • Multicusp ion sources are capable of producing ions with low axial energy spread which are necessary in applications such as ion projection lithography (IPL) and radioactive ion beam production. The addition of a radially extending magnetic filter consisting of a pair of permanent magnets to the multicusp source reduces the energy spread considerably due to the improvement in the uniformity of the axial plasma potential distribution in the discharge region. A coaxial multicusp ion source designed to further reduce the energy spread utilizes a cylindrical magnetic filter to achieve a more uniform axial plasma potential distribution. The coaxial magnetic filter divides the source chamber into an outer annular discharge region in which the plasma is produced and a coaxial inner ion extraction region into which the ions radially diffuse but from which ionizing electrons are excluded. The energy spread in the coaxial source has been measured to be 0.6 eV. Unlike other ion sources, the coaxial source has the capability of adjusting the radial plasma potential distribution and therefore the transverse ion temperature (or beam emittance).
    • 多重离子源能够产生具有低轴向能量扩散的离子,其在诸如离子投影光刻(IPL)和放射性离子束生产的应用中是必需的。 由放电区域中的轴向等离子体电位分布的均匀性的改善,向多焦点源添加由一对永磁体构成的径向延伸的磁性过滤器增加了能量扩散。 设计用于进一步降低能量传播的同轴多叶离子源利用圆柱形磁性过滤器来实现更均匀的轴向等离子体电位分布。 同轴磁性过滤器将源室划分成其中产生等离子体的外部环形放电区域和离子径向扩散而从其中排除电离电子的同轴内部离子提取区域。 同轴源中的能量传播已经被测量为0.6eV。 与其他离子源不同,同轴源具有调整径向等离子体电位分布和横向离子温度(或光束发射率)的能力。