Effect of thin film coating of Au on joint strength in invar-invar packages |
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| Authors: | S C Wang C M Wang C Wang H L Chang Y K Tu C J Hwang S Chi W H Wang Y D Yang W H Cheng |
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| Institution: | (1) Telecommunication Laboratories, 12, Lane 551, Min-Tsu Rd., Sec. 3, Yang-Mei, Taoyuan, Taiwan;(2) Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan;(3) Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan |
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| Abstract: | The effect of a thin film coating of Au on the joint strength, weld width, and penetration depth in laser welding techniques
for Invar-Invar packages is investigated experimentally. It is found that the joint strength, weld width, and penetration
depth are strongly dependent on the coating of Au thickness on the Invar material. The welded joints with thick Au coating
show narrower weld width, shallower penetration, and hence less joint strength than those of the packages with thin Au coating.
The increase in both the thermal conductivity and the vapor volume in the welded joints as the coating of Au thickness increases
are the possible mechanisms for the reduction. Detailed knowledge of the effect of thin film coatings of Au on the welded
materials, which gives both the highest joint strength and good adhesion, is essential for practical design and fabrication
of reliable optoelectronic packaging. |
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| Keywords: | Invar material Laser welding Semiconductor laser packaging Thin film coating |
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