论文信息 - Self-assembled monolayers for reduced temperature direct metal thermocompression bonding

Self-assembled monolayers for reduced temperature direct metal thermocompression bonding

A reduction in the bonding temperature required for direct gold-gold (Au–Au) thermocompression bonding is observed by coating a monolayer of dodecanethiol on gold surfaces prior to bonding. The results show that Au–Au bonded joints of 26.9g per bump strength can be achieved at a temperature as low as 160°C. The temperature drop becomes more apparent when both coated and blank gold samples are exposed in air over some time before bonding. The authors propose that self-assembled monolayers passivate metal surface by obviating the adsorption of surface contaminants, in particular, carbon and oxygen but get desorbed just before bonding takes place.

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