Triple-Stacked Silicon-on-Insulator Integrated Circuits Using Au/SiO2 Hybrid Bonding

被引:0
|
作者
Honda, Yuki [1 ]
Goto, Masahide [1 ]
Watabe, Toshihisa [1 ]
Nanba, Masakazu [1 ]
Iguchi, Yoshinori [1 ]
Saraya, Takuya [2 ]
Kobayashi, Masaharu [2 ]
Higurashi, Eiji [3 ]
Toshiyoshi, Hiroshi [2 ]
Hiramoto, Toshiro [2 ]
机构
[1] NHK STRL, Tokyo, Japan
[2] Univ Tokyo, Tokyo, Japan
[3] AIST, Tsukuba, Ibaraki, Japan
关键词
3D integrated circuits (ICs); CMOS integrated circuits; integrated circuit interconnections; silicon-on-insulator (SOI); wafer bonding; multi wafer stacking;
D O I
10.1109/S3S46989.2019.9320733
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This study demonstrates a triple-stacking process of a silicon-on-insulator (SOI) wafer by repeating (1) the embedment of 5-mu m-diameter gold (Au) electrode sites in a polished silicon oxide (SiO2) surface, (2) Au/SiO2 hybrid bonding with a thin silicon layer in between, and (3) subsequent lost-wafer processes. Inverters prepared on separate SOI wafers are vertically connected through Au electrodes. Feasibility tests are performed by developing triple-stacked ring oscillators (ROs) with 101 stages. The experimental results confirm a successful RO operation and indicate that the developed process is promising for three-dimensional integrated circuits using the multi-wafer stacking technique.
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页数:3
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