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    • 10. 再颁专利
    • Method and apparatus for controlling ion implantation during vacuum fluctuation
    • 在真空波动期间控制离子注入的方法和装置
    • USRE40008E1
    • 2008-01-22
    • US10602795
    • 2003-06-24
    • Steven R. Walther
    • Steven R. Walther
    • G21G5/10
    • H01J37/304H01J37/3171H01J2237/31703
    • A method and apparatus for controlling implantation during vacuum fluctuations along a beam line. Vacuum fluctuations may be detected based on a detected beam current and/or may be compensated for without measuring pressure in an implantation chamber. A reference level for an ion beam current can determined and a difference between the reference value and the measured ion beam current can be used to control parameters of the ion implantation process, such as a wafer scan rate. The difference value can also be scaled to account for two types of charge exchanging collisions that result in a decrease in detected beam current. A first type of collision, a non-line of sight collision, causes a decrease in detected beam current, and also a decrease in the total dose delivered to a semiconductor wafer. A second type of collision, a line of sight collision, causes a decrease in detected beam current, but does not affect a total dose delivered to the wafer. Scaling of the difference can therefore be used to adjust a wafer scan rate that accounts for non-line of sight collisions.
    • 一种用于在沿着光束线的真空波动期间控制植入的方法和装置。 可以基于检测到的束电流来检测真空波动和/或可以在不测量注入室中的压力的​​情况下补偿真空波动。 可以确定离子束电流的参考水平,并且可以使用参考值和测量离子束电流之间的差来控制离子注入过程的参数,例如晶片扫描速率。 差值也可以被缩放以考虑导致检测到的束电流减小的两种类型的电荷交换冲突。 第一类型的碰撞,非视线碰撞导致检测到的束电流降低,并且还导致递送到半导体晶片的总剂量的减小。 第二种类型的碰撞,视线碰撞导致检测到的束电流降低,但不影响传送给晶片的总剂量。 因此,差异的缩放可用于调整考虑非视线碰撞的晶片扫描速率。