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    • 2. 发明申请
    • PREDICTION AND COMPENSATION OF EROSION IN A MAGNETRON SPUTTERING TARGET
    • 磁控溅射目标中的腐蚀预测和补偿
    • WO2009085157A1
    • 2009-07-09
    • PCT/US2008/013766
    • 2008-12-16
    • APPLIED MATERIALS, INC.MILLER, Keith, A.LUBBEN, Daniel, C.
    • MILLER, Keith, A.LUBBEN, Daniel, C.
    • H01L21/203
    • C23C14/35H01J37/3408H01J37/3482
    • When a magnetron (72) is scanned about the back of a target (38) in a selected complex path (150) having radial components, the target erosion profile has a form depending upon the selection of paths. A radial erosion rate profile (160) for a given magnetron is measured. Periodically during scanning, an erosion profile (168) is calculated from the measured erosion rate profile (160) and profiles (162, 164, 166) derived from it, the time the magnetron spends at different radii, and the target power. The calculated erosion profile may be used to indicate when erosion has become excessive at any location prompting target replacement or to adjust the height of the magnetron above the target for repeated scans, hi another aspect of the invention, the magnetron height is dynamically adjusted (206) during a scan to compensate for erosion. The compensation may be based on the calculated erosion profile or on feedback control of the present value of the target voltage (124) for a constant-power target supply (110).
    • 当在具有径向分量的选定复合路径(150)中围绕目标(38)的背面扫描磁控管(72)时,目标侵蚀曲线具有取决于路径选择的形式。 测量给定磁控管的径向侵蚀速率曲线(160)。 在扫描期间,根据测得的侵蚀速率曲线(160)和衍生自其的轮廓(162,164,166),磁控管在不同半径处的时间和目标功率计算出侵蚀曲线(168)。 所计算的侵蚀曲线可用于指示在任何位置处的侵蚀已经变得过度,促使目标更换或调整靶上方的磁控管的高度以重复扫描。在本发明的另一方面,磁控管高度被动态地调节(206 ),以补偿侵蚀。 补偿可以基于所计算的侵蚀曲线或者针对恒定功率目标电源(110)的目标电压(124)的当前值的反馈控制。