Fatigue Experiments on Single Crystal Silicon in an Oxygen-Free Environment
The fatigue lifetime of single crystal silicon (SCS) was characterized in an environment free of oxygen, humidity, and organics. Long-term (> 10 10 Hz) fatigue experiments performed with smooth-walled SCS devices showed no signs of fatigue damage up to 7.5 GPa. In contrast, experiments using SCS...
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Veröffentlicht in: | Journal of microelectromechanical systems 2015-04, Vol.24 (2), p.351-359 |
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Sprache: | eng |
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Zusammenfassung: | The fatigue lifetime of single crystal silicon (SCS) was characterized in an environment free of oxygen, humidity, and organics. Long-term (> 10 10 Hz) fatigue experiments performed with smooth-walled SCS devices showed no signs of fatigue damage up to 7.5 GPa. In contrast, experiments using SCS devices with a silicon dioxide (SiO 2 ) coating and rough sidewalls due to scalloping from deep reactive ion etching exhibited fatigue drift at 2.7 GPa and suffered from short-term (3 GPa. In these SCS-SiO 2 experiments, the initiation of fracture occurs in the SiO 2 layer. It is concluded that fatigue in this case is likely attributed to a subcritical cracking mechanism; not reaction-layer nor dislocation related. A cross-comparison with other works from literature is developed to show that packaging a pristine device in an inert environment is necessary in order to operate devices at high-stress levels. |
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ISSN: | 1057-7157 1941-0158 |
DOI: | 10.1109/JMEMS.2014.2331231 |