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High-speed copper electrodeposition is needed to optimize the TSV process with a high throughput. To inhibit electrodeposition on the top surface of the TSV, the ODT was microcontact-printed on the top surface. The ODT microcontact-printing effectively inhibits the copper electrodepositon on the top surface. With 1.0 ppm SDDACC, V-shapes were formed in the via cross sections and these shapes lead to bottom-up via filling . Without micro-contact-printing, and with 1.5 ppm SDDACC, V-shapes were again formed in the via cross sections and these shapes lead to bottom-up via filling. We succeeded in filling 10 μm diameter and 70 μm deep vias within 35 minutes without micro-contact-printing. This was achieved by optimizing the SDDACC concentration with CVS measurements. The inhibition layer of the micro-contact-printing does not speed up the TSV electrodeposition. The most important factor to speed up the TSV electrodeposition is optimization of the additives.
Date of Conference: Jan. 31 2012-Feb. 2 2012