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    • 1. 发明申请
    • Method and structure for preventing adhesive bleed onto surfaces
    • 防止粘合剂渗透到表面上的方法和结构
    • US20010028117A1
    • 2001-10-11
    • US09881466
    • 2001-06-14
    • International Business Machines Corporation
    • Bernd K. AppeltGary A. JohanssonGerald W. JonesLuis J. MatienzoYenloan H. NguyenKonstantinos I. Papathomas
    • H01L029/40
    • B82Y30/00B82Y10/00H01L21/4864H01L23/49894H01L24/80H01L2924/01006H01L2924/01029H01L2924/01033H01L2924/01046H01L2924/01047H01L2924/01078H01L2924/01079H01L2924/01087H01L2924/014H01L2924/14
    • A method and structure is provided for preventing wetting or bleed of an adhesive, such as an epoxy, onto noble metal wire bond pads on the surface of a dielectric substrate when attaching an I/C chip to the substrate. The method includes treating the wire bond pads with a chemical composition which prevents bleeding onto the surfaces of the wire bond pads by a component of the epoxy. The chemical composition is a chemical which will provide nullSelf-Assembled Monolayersnull (SAMs) on the surface of the gold. These compositions are characterized by a molecule having at least one group, such as a mercaptan or disulfide, connected to a hydrocarbon moiety, such as a (CH2)x chain. The affinity of the thiol or sulfur-containing portion of the molecule chemically bonding with the noble metal provides a relatively strong attachment of the molecule to the metal surface. The hydrocarbon segment presents a surface on the noble metal that has the characteristics of the hydrocarbon portion of the molecule which has a low surface tension, and, thus, prevents wetting of the noble metal by an epoxy adhesive component. The SAMs, once they provide protection from the bleed of the die attach adhesives, self desorb during the wire bonding or soldering temperatures.
    • 提供了一种方法和结构,用于当将I / C芯片附接到基板时,防止粘合剂(例如环氧树脂)在电介质基板的表面上的贵金属引线接合焊盘上的润湿或渗出。 该方法包括用化学成分处理引线接合焊盘,该化学组合物防止由环氧树脂的部件渗透到引线接合焊盘的表面上。 化学成分是一种在金表面提供“自组装单层”(SAM)的化学成分。 这些组合物的特征在于具有连接到烃部分如(CH 2)x链的至少一个基团的硫醇或二硫化物的分子。 与贵金属化学键合的分子的硫醇或含硫部分的亲和性提供了分子与金属表面相对较强的附着。 碳氢化合物段在贵金属上呈现具有低分子表面张力的分子的特征的表面,从而防止了环氧粘合剂组分对贵金属的润湿。 SAMs一旦提供防止裸片附着胶粘剂的泄漏,在引线接合或焊接温度期间自解吸。