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1. 厦门大学 机电工程系,福建 厦门 361005
2. 厦门大学 萨本栋微机电研究中心,福建 厦门,361005
收稿日期:2008-03-26,
修回日期:2008-06-16,
纸质出版日期:2009
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曾毅波, 王凌云, 谷丹丹, 孙道恒. 超声技术在硅湿法腐蚀中的应用[J]. 光学精密工程, 2009,17(1): 166-171
ZENG Yi-bo, WANG Ling-yun, GU Dan-dan, SUN Dao-heng. Application of ultrasonic technology to wet etching of silicon[J]. Editorial Office of Optics and Precision Engineering, 2009,17(1): 166-171
为了获得平滑的硅湿法腐蚀表面
在硅湿法腐蚀中引入超声技术。对超声湿法腐蚀系统进行了改进
以确保腐蚀溶液的顶部和底部温差在0.5 ℃之内。采用60 ℃
10 %质量分数的KOH溶液
在超声频率为59 kHz
超声功率为60~180 W(间隔10 W)条件下对(100)硅片进行湿法腐蚀。最后
运用激光共聚焦扫描显微镜(LSCM)对腐蚀后硅片表面粗糙度进行测量
并探讨超声参数的选择对腐蚀表面质量的影响。实验结果表明:超声功率在120 W时
可以获得平滑的腐蚀表面
表面粗糙度
Rq
值为0.020 m。在湿法腐蚀系统中采用超声技术
可以明显改善腐蚀表面质量
在较低温度和较低浓度的KOH溶液中
选择合适的超声参数可获得高品质的腐蚀表面。
In order to achieve smooth wet etching surface of silicon
ultrasonic technology is introduced in the wet etching of silicon. By improving the ultrasonic wet etching system
the temperature difference between top and bottom etching solutions can reach 0.5℃. Then
at 60℃(100)
silicon is etched wetlly by KOH solution in mass ratio of 10%
ultrasonic frequency of 59 kHz and ultrasonic power ranging from 60 W to 180 W (every 10 W). Finally
the post-etched surface roughness is measured by Laser Scanning Confocal Microscope (LSCM)
and the effect of ultrasonic parameters on the quality of etching surface is discussed. Experimental results indicate that the smooth etching surface can be obtained in roughness
Rq
of 0.02 m at ultrasonic power of 120 W. The quality of etching surface is greatly improved in the ultrasonic wet etching system
also the etching surface of high quality can be obtained with suitable ultrasonic parameters in lower temperature and concentration of KOH solution.
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