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Memorias de investigación
Communications at congresses:
Silicon oxide sacrificial layers deposited by pulsed-DC magnetron sputtering for MEMS applications
Year:2009
Research Areas
  • Electronics engineering
Information
Abstract
Surface micromachining requires the use of easily-removable sacrificial layers fully compatible with all the materials and technological processes involved. Silicon dioxide films, thermally grown on silicon substrates or deposited by CVD, are commonly used as sacrificial layers in surface micromachining technologies, despite their low lateral etch rate in conventional fluorinate solutions. The development of silicon oxide layers with high etch rates poses a great technological challenge. In this work we have investigated the possibility of obtaining easily removable silicon oxide layers by pulsed-DC magnetron reactive sputtering. We have carried out a comprehensive study of the influence of the deposition parameters (total pressure and gas composition) on the composition, residual stress and lateral etch rate in fluorine wet solutions of the films. This study has allowed to determine the sputtering conditions to deposit, at very high rates (up to 0.1 ¿m/min), silicon oxide films with excellent characteristics for their use as sacrificial layers. Films with roughness around 5 nm rms, residual stress below 100 MPa and very high etch rate (up to 5 ¿m/min in the lateral directions), around 70 times greater than for thermal silicon oxide, have been achieved. The structural characteristics of these easily removable silicon oxide layers have been assessed by infrared spectroscopy and atomic force microscopy, which have revealed that the films exhibit some kind of porous structure, related to very specific sputter conditions. Finally, the viability of these films has been demonstrated by using them as sacrificial layer in the fabrication process of AlN-based microresonators.
International
Si
Congress
SPIE Europe Microtechnologies for the New Millennium 2009
960
Place
Dresde, Alemania
Reviewers
Si
ISBN/ISSN
0277-786X
Start Date
04/05/2009
End Date
06/05/2009
From page
1
To page
12
Smart Sensors, Actuators, and MEMS IV, Proc. of the SPIE vol. 7362
Participants
  • Participante: L. Vergara (ICMM-CSIC)
  • Autor: Sheila González Castilla (UPM)
  • Participante: L. Pulido (Universidad Politécnica de Madrid)
  • Autor: Jimena Olivares Roza (UPM)
  • Autor: Marta Clement Lorenzo (UPM)
  • Autor: Enrique Iborra Grau (UPM)
  • Autor: Jesus Sangrador Garcia (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Microsistemas y Materiales Electrónicos
  • Departamento: Tecnología Electrónica
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