Low-stress dicing assisted by pulsed laser for multilayer MEMS

Masayuki Fujita; Yusaku Izawa; Yosuke Tsurumi; Shuji Tanaka; Hideyuki Fukushi; Keiichi Sueda; Yoshiki Nakata; Noriaki Miyanaga; Masayoshi Esashi

doi:10.1117/12.808370

24 February 2009 Low stress dicing assisted by pulsed laser for multilayer MEMS

Masayuki Fujita, Yusaku Izawa, Yosuke Tsurumi, Shuji Tanaka, Hideyuki Fukushi, Keiichi Sueda, Yoshiki Nakata, Noriaki Miyanaga, Masayoshi Esashi

Author Affiliations +

Proceedings Volume 7202, Laser-based Micro- and Nanopackaging and Assembly III; 72020F (2009) https://doi.org/10.1117/12.808370
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

We have developed a novel debris-free in-air laser dicing technology, which is expected to give less failure of MEMS devices and hence improves yields. Our technology combines two processes: a dicing guide fabrication and a wafer separation process. The first process is internal transformation using a nanosecond Nd:YVO₄ laser with high repetition rate and/or a pulsed fiber laser with 200ns pulsewidth. The laser pulses are focused inside the MEMS wafer without surface ablation. In order to make cross-sectional internal transformation, the laser beam is scanned several times with defocusing. The laser scanning speed per each scanning is 100-700 mm/sec depending on the layer material, the machining time is much faster than the conventional blade dicing. The second process is non-contact separation by thermally-induced crack propagation using a CO₂ laser or mechanical separation by bending stress. In the each separation process, the internal transformation fabricated in the first process worked well as the guide of separation, and the processed wafer was diced with low stress. This dicing technology was applied for 4-inch MEMS wafers, e.g. pressure sensors, etc., and the sensor chips were separated without mechanical damages.

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Masayuki Fujita, Yusaku Izawa, Yosuke Tsurumi, Shuji Tanaka, Hideyuki Fukushi, Keiichi Sueda, Yoshiki Nakata, Noriaki Miyanaga, and Masayoshi Esashi "Low stress dicing assisted by pulsed laser for multilayer MEMS", Proc. SPIE 7202, Laser-based Micro- and Nanopackaging and Assembly III, 72020F (24 February 2009); https://doi.org/10.1117/12.808370

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KEYWORDS

Semiconducting wafers

Microelectromechanical systems

Glasses

Silicon

Fiber lasers

Pulsed laser operation

Laser applications

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