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A Wafer-Scale Etching Technique for High Aspect Ratio Implantable MEMS Structures.
1Dept of Electrical and Computer Engineering, University of Utah 50 South Central Campus Drive, Salt Lake City, UT 84112, USA.
Sensors and Actuators. A, Physical
|August 14, 2010
Summary
A new wafer-scale etching method improves the fabrication of Utah electrode arrays (UEA) for neural recording. This process significantly reduces costs and processing time while enhancing electrode uniformity for better neural interface performance.
Area of Science:
- Microsystem technology
- Biomedical engineering
- Neurotechnology
Background:
- Microelectrode arrays, like the Utah electrode array (UEA), are crucial for neural recording and stimulation.
- Current UEA fabrication relies on dicing and wet etching, yielding variable electrode geometries and requiring extensive processing time.
- Optimizing electrode shape and uniformity is essential for reliable neural interface performance.
Purpose of the Study:
- To develop and present a wafer-scale etching method for fabricating uniform Utah electrode arrays.
- To reduce the time, labor, and cost associated with UEA production.
- To improve the geometrical consistency of electrodes within and across arrays.
Main Methods:
- Developed a wafer-scale etching technique for UEA fabrication.
- Investigated silicon column etching rates as a function of temperature, time, and stirring rate in HF-HNO(3) solution.
- Established optimal etching conditions for uniform electrode array production.
Main Results:
- Achieved substantial reductions in processing time, increased throughput, and lowered fabrication costs.
- Demonstrated significantly improved geometrical uniformity: 1.5 ± 0.5% within arrays and 2 ± 0.3% across wafers.
- Identified key parameters (temperature, time, stirring rate) influencing etching rates and uniformity.
Conclusions:
- The presented wafer-scale etching method offers a more efficient and cost-effective approach to UEA fabrication.
- This method significantly enhances electrode uniformity, crucial for advanced neural recording and stimulation applications.
- Optimized etching parameters ensure consistent and high-quality microelectrode array production on a large scale.
