A study on Bubble-like Defects in Silicon Wafer Direct Bonding

실리콘 웨이퍼 직접 접합에서 기포형 접합 결합에 관한 연구

  • Published : 2001.03.01

Abstract

The success of SDB (silicon wafer direct bonding) technology can be estabilished by bonding on the bonded interface with no defects and Preventing temperature dependent bubbles. In this research, we observed the behavior of the intrinsic bubbles by transmitting the infrared light and the increase of the bubble pressure was found. And, the $SiO_2$-$SiO_2$ bonded wafer was achieved, which generates no intrinsic bubbles in the annealing under the atmospheric pressure. The intrinsic bubbles in the $SiO_2$-$SiO_2$ bonded wafer were generated in the annealing in the ultra high vacuum. This experimental result shows the relation between the bubble growth and the pressure.

실리콘 웨이퍼 직접 접합을 성공하기 위해서는 양호한 접합면을 구성하여야 하며, 이를 위해 접합면에서 발생하는 주요 결함 중 하나인 기포형 접합 결함을 억제하여야 한다. 본 연구에서는 접합면에서 발생하는 기포형 결함의 상온 접합 및 열처리 과정에서의 거동을 관찰하여 내부의 압력이 증가함을 직접 관찰할 수 있었다. 또한, 대기압 하의 열처리에서 결함이 발생하지 않는 $SiO_2$-$SiO_2$ 접합 웨이퍼가 진공에서의 열처리에서 결함이 발생하는 현상을 통해 기포형 결함의 내부 압력과 성장과의 관계를 실험을 통하여 증명할 수 있었다.

Keywords

References

  1. M.A.Schmidt, 'Wafer to Wafer Bonding for Microstructure Formation,' 98 Proceedings of the IEEE, Integrated Sensors, Microactuators & Microsystems, (1998) https://doi.org/10.1109/5.704262
  2. S.M. Sze, 'Semiconductor Sensor,' JOHN WILEY & SONS, INC, pp. 42-74. (1994)
  3. Sorin Cristoloveanu, 'Electriccal characterization of silicon on insulator materials and devices', Kluwer Academic Publishers, pp. 1-44, (1995)
  4. K. Izumi, M. Doken, H. Ariyoshi, 'CMOS devices fabricated on buried SiO$_2$ layers formed by oxygen implantation into silicon,' Electron Lett., 14, 593, (1978) https://doi.org/10.1049/el:19780397
  5. S. Cristoloveanu, S.S. Li, 'Electrical characterization of slilicon on insluator materials and devices', Kluwer Academic, Boston (1995)
  6. M. Bruel, 'Silicon on insulator material technology', Electron. Lett., 31, 1201 (1995) https://doi.org/10.1049/el:19950805
  7. Xiang Lu, S. Sundar Kumar Lyer, Chenming Hu, Nathan W. Cheung, Jing Min, Zhineng Fan, Paul K. Chu, 'Ion cut silicon on insulator fabrication with plasma immersion ion implantation', Appl. Phys. Lett., 71, 19 (1997) https://doi.org/10.1063/1.120127
  8. K. Mitani, Volker Lehmann, R. Stengl, D. Feijoo, U. M. Gosele, H.Z. Massoud, 'Cause and Prevention of Temperature-Dependent Bubbles in Silicon Wafer Bonding', Jpn. J. Appl. Phys, Vol. 30, 4 (1991) https://doi.org/10.1143/JJAP.30.615
  9. K. Mitani, U.M. Gosele, 'Formation of Interface Bubbles in Bonded Silicon Wafers: A Thermodynamic Model', Appl. Phys., A 54, (1992) https://doi.org/10.1007/BF00324337
  10. Q. Y. Tong, G. Kaido, L. Tong, M. Feiche, F. Shi, J. Steinkircchner, T.Y. Tan, U. Gosele, 'A Simple Chemical Treatment for Preventing Thermal Bubbles in Silicon Wafer Bonding', J. Electrochem. Soc. vol. 142, 10 (1995) https://doi.org/10.1149/1.2050045