Investigation on the processing quality of nanosecond laser stealth dicing for 4H-SiC wafer

Q Song, Z Zhang, Z Xu, Z Wen, H Shi… - ECS Journal of Solid …, 2023 - iopscience.iop.org
Silicon carbide (SiC), due to its characteristic materials performance, gets more attention in
Radio Frequecy (RC) and High-power device fabrication. However, SiC wafer dicing has …

Whereabouts of missing atoms in a laser-injected Si (part IV): interaction of plasma Si with dislocations in a laser-injected Si

H Saka, H Iwata - Philosophical Magazine, 2024 - Taylor & Francis
The interaction of dislocations with plasma Si in a laser-injected Si was studied
comprehensively using a combination of in-situ and ex-situ heating experiments in 200 kV …

Electron microscopy of voids in Si formed by permeable pulse laser irradiation

H Iwata, D Kawaguchi, H Saka - Microscopy, 2017 - academic.oup.com
Voids formed in Si by permeable laser irradiation were investigated by comprehensive
electron microscopy. Two types of voids were identified: Type (1): This type was formed …

Whereabouts of missing atoms in a laser-injected Si (Part III)

H Saka, H Iwata, M Takagi - Philosophical Magazine, 2023 - Taylor & Francis
Microstructure of laser induced modified volume (LIMV) in Si was examined using
transmission electron microscopy (TEM) and infra-red optical microscopy. Dominant features …

[PDF][PDF] Modification and machining on back surface of a silicon substrate by femtosecond laser pulses at 1552 nm

Y Ito, H Sakashita, R Suzuki, M Uewada… - Journal of Laser Micro …, 2014 - jlps.gr.jp
Silicon (Si) is widely used material in microelectronics, MEMS, photonics and more.
Although Si is not transparent for commonly used processing lasers in near infrared to …

Molecular-dynamics study of void-formation inside silicon wafers in stealth dicing

K Shimamura, J Okuma, S Ohmura… - Journal of Physics …, 2012 - iopscience.iop.org
The mechanism of void formation in crystalline silicon after laser irradiation is extensively
studied by molecular-dynamics simulations. When the laser-irradiated region is melted due …

Whereabouts of missing atoms in a laser-injected Si: Part 1

D Kawaguchi, H Iwata, H Saka - Philosophical Magazine, 2019 - Taylor & Francis
In a stealth dicing of Si wafers, voids are formed in laser-induced modified volumes (LIMVs).
Most of the voids are free from apparent defects such as dislocations and cracks. Needless …

Electron Microscopy on Mechanism of Voidage and Cracking in Si by Injection of a Permeable Infra-Red Laser

H Iwata, H Saka - MATERIALS TRANSACTIONS, 2024 - jstage.jst.go.jp
Si is opaque to visible light, but transparent to infrared rays. Therefore, when the infrared
laser is focused inside Si, the focal portion becomes ultra-hot, forming a modified volume …

Nonlinear micro-processing of silicon by ultrafast fiber laser at 1552 nm

Y Ito, R Tanabe, K Tada - MRS Online Proceedings Library (OPL), 2011 - cambridge.org
Processing of transparent materials by non-linear absorption mechanisms induced by short
pulse lasers has been applied in many fields. Silicon (Si) is widely used materials in …

Debris-free Low-stress High-speed Laser-assisted Dicing for Multi-layered MEMS

M Fujita, Y Izawa, Y Tsurumi, S Tanaka… - IEEJ Transactions on …, 2010 - jstage.jst.go.jp
We have developed a novel debris-free low-stress high-speed laser-assited dicing
technology for multi-layered MEMS wafers, which generally consist of glass and Si. Our …