Oscillator Electrode Tapered Geometry and Impurity Gradient
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Solution Overview
Problem
In the production of oscillators using microprocessing techniques, stress concentration issues arise due to angular portions and defects, leading to potential damage and short circuits between electrodes, compromising the reliability of the devices.
Innovation Solution
A method involving ion implantation of impurities with a concentration gradient in the first electrode, forming a tapered plane, and using a sacrificial layer to reduce stress concentration points and prevent short circuits, while maintaining electrode reliability and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microprocessing technique of the related art is used to form an electrode, then the electrode can be formed on a substrate, but a small angular portion is formed in the vicinity of an edge of the electrode which causes stress concentration and potential short circuits
Solution Approach 1:
The patent applies parameter changes by controlling the impurity concentration distribution in the semiconductor layer to monotonically decrease from the upper surface side to the lower surface side. This parameter control prevents angular portions from forming during etching, thereby eliminating stress concentration points while maintaining the electrode formation process
Solution Approach 2:
The patent implements preliminary action by pre-forming the impurity concentration gradient in the semiconductor layer before the electrode formation and etching processes. This preliminary preparation ensures that when etching occurs, the tapered plane is automatically formed without angular portions, preventing stress concentration before it can occur
2Reliability
If ion implantation is performed to control impurity distribution, then stress concentration is reduced, but additional process steps are required
Solution Approach 1:
The patent merges the impurity introduction step with the existing semiconductor layer formation process. By performing ion implantation during or after the semiconductor layer deposition, the patent combines multiple functions (layer formation and impurity distribution control) into a unified process flow, minimizing additional complexity while achieving stress concentration reduction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces stress concentration points and prevents short circuits between electrodes, enhancing the reliability and durability of the oscillators by controlling impurity distribution and electrode shape.
Implementation Method 1
ion implanting a first impurity into a first region of the first layer
Data Source
AI summary
A method for producing an oscillator includes: (a) forming a first layer on a substrate; (b) ion implanting a first impurity into a first region of the first layer; (c) forming a first electrode having a tapered plane on a side surface thereof by patterning the first layer; (d) forming a sacrificial layer on the first electrode and on the tapered plane of the first electrode; (e) forming a second electrode on the substrate and the sacrificial layer; and (f) removing the sacrificial layer. The step (b) is performed so that the concentration of the first impurity monotonically decreases from the upper surface side to the lower surface side in a region located at a depth of more than 10 nm from the upper surface of the first electrode.