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    • 6. 发明申请
    • ALUMINUM SPUTTERING WHILE BIASING WAFER
    • 漂白抛光铝铝溅射
    • WO2007024465A2
    • 2007-03-01
    • PCT/US2006030784
    • 2006-08-08
    • APPLIED MATERIALS INCLEE WEI TIGUO TEDYO SANG-HO
    • LEE WEI TIGUO TEDYO SANG-HO
    • C23C14/00
    • C23C14/185C23C14/025C23C14/046C23C14/345
    • An aluminum sputtering process including RF biasing the wafer and a two-step aluminum fill process and apparatus used therefor to fill aluminum into a narrow via hole by sputtering under two distinctly different conditions, preferably in two different plasma sputter reactors (168, 170). The first step (130) includes sputtering a high fraction of ionized aluminum atoms onto a relatively cold wafer, e.g., held at less than 15O0C, and relatively highly biased to attract aluminum atoms into the narrow holes and etch overhangs. The second step (132) includes more neutral sputtering onto a relatively warm wafer, e.g. held at greater than 25O0C, and substantially unbiased to provide a more isotropic and uniform aluminum flux. The magnetron scanned about the back of the aluminum target may be (80) relatively small and unbalanced in the first step and (60) relatively large and balanced in the second step.
    • 铝溅射工艺包括RF偏置晶片和两步铝填充工艺和装置,用于通过在两个明显不同的条件下优选在两个不同的等离子体溅射反应器(168,170)中的溅射将铝填充到窄通孔中。 第一步骤(130)包括将大部分电离铝原子溅射到相对冷的晶片上,例如保持在小于150℃,并且相对高度偏置以将铝原子吸引到窄孔中并蚀刻突出端。 第二步骤(132)包括在相对温暖的晶片上的更中性的溅射。 保持在大于250℃,并且基本上无偏差以提供更多的各向同性和均匀的铝通量。 在第一步中围绕铝靶的背面扫描的磁控管可能(80)相对较小并且不平衡,(60)在第二步中相对较大和平衡。