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    • 30. 发明授权
    • Low alpha tin
    • 低阿尔法锡
    • US09425164B1
    • 2016-08-23
    • US14950852
    • 2015-11-24
    • International Business Machines Corporation
    • Charles L. ArvinMichael S. Gordon
    • H01L21/44H01L23/00H01L21/477
    • H01L24/81H01L21/477H01L24/11H01L24/14H01L2224/13611H01L2224/81024H01L2224/81055
    • A non alpha controlled Tin including Tin and a trace amount of Polonium may be converted to a low alpha emission Tin by concentrating and removing at least some of the Polonium. The non alpha controlled Tin may be a raw material or a solder bump upon a semiconductor wafer, chip, or carrier. The Polonium may be concentrated by oxidizing an exterior portion of the non alpha controlled Tin. If the non alpha controlled Tin is a raw material, the oxidized exterior portion of the non alpha controlled Tin may be stripped. If the non alpha controlled Tin is a solder bump, the oxidized exterior portion of the solder bump may be removed by applying flux to the solder bump, reflowing the solder bump to dissolve the oxidized exterior portion and the concentrated Po into the flux, and cleaning the flux from the solder bump.
    • 包括锡和痕量的onium的非α控制锡可以通过浓缩和去除至少一些Pol藜来转化为低α发射锡。 非α控制锡可以是半导体晶片,芯片或载体上的原料或焊料凸块。 可以通过氧化非α受控锡的外部部分来浓缩onium。 如果非α受控锡是原料,则非α受控锡的氧化外部部分可能被剥离。 如果非α控制的锡是焊料凸点,则可以通过向焊料凸块施加焊剂来去除焊料凸起的氧化外部部分,回流焊料凸块以将氧化的外部部分和浓缩的Po溶解到焊剂中,并且清洁 来自焊料凸块的焊剂。