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张建华

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期刊论文

A Low Cost Bumping Method for Flip Chip Assembly and MEMS Integration

张建华Jianhua Zhang Changhai Wang Jun Zeng and Ah Ju Pang

IEEE TRANSACTIONS ON COMPONENTS AND PACKAGING TECHNOLOGIES, VOL.30, NO.4, DECEMBER 2007,-0001,():

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摘要/描述

In this paper, we present the development of a low cost chip/wafer bumping technique for flip chip assembly and microelectromechanical systems integration using a bump transfer approach. In this method, high melting temperature bumps such as copper, nickel, and gold bumps are fabricated on a lowcost, flexible carrier and then transferred onto the target chip/wafer/board for flip chip assembly. The aluminum pads on test chips were remetallized with electroless nickel and gold layers to facilitate the bonding of bumps to the chips using thermocompression bonding. Parallel bonding and transfer of bumps has been achieved. Thermal cycling and bump shear test showed that reliable bonding was obtained between the bumps and the pads. Surface study using laser ionization mass analysis found no traces of of the polymer carrier on the surface of the bumps on the test chip after the completion of the bump transfer process.

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