Semiconductor Electrode Groove and Protrusion Crack Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Semiconductor devices face performance degradation due to crack generation in the first electrode layer caused by stress differences between the protective insulation film and the second electrode layer, leading to potential thermal expansion and long-term heat exposure.
Innovation Solution
A semiconductor device design featuring a first electrode layer with a groove portion and a second electrode layer with a protrusion portion, where the second electrode layer material has higher mechanical strength than the first electrode layer, to physically suppress crack growth by partial division and strategic positioning of the protrusion below the center of the first electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If both the protective insulation film and the second electrode layer are in contact with the upper face of the first electrode layer, then the device structure is simple and easy to manufacture, but stress distribution becomes uneven and cracks may generate at the boundary area
Solution Approach 1:
The first electrode layer is divided into a first area (contacting the protective insulation film) and a second area (contacting the second electrode layer) by introducing a groove portion. This segmentation separates the contact regions, preventing stress concentration at the boundary and eliminating crack generation while maintaining the simple structure of having both films contact the electrode layer.
2Ease of manufacture
If the first electrode layer is made with lower mechanical strength material, then the device can be manufactured with standard materials and processes, but cracks can grow large under thermal stress and heat exposure
Solution Approach 1:
The groove portion is positioned such that the first area (with lower mechanical strength material) is located where cracks are less likely to initiate and propagate, while the second area maintains adequate mechanical strength. This local quality differentiation allows the use of standard materials while preventing crack growth through strategic spatial arrangement.
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 design effectively prevents crack growth in the first electrode layer, maintaining device performance by reducing stress and thermal expansion differences, and ensuring the inner part of the first electrode layer remains functional.
Implementation Method 1
Upon the semiconductor device operating and thereby generating heat, the respective components thermally expand, and as a result of interaction thereof, stress is generated in the respective components
Data Source
AI summary
A semiconductor device including: a semiconductor substrate a semiconductor element is formed; a first electrode layer stacked on the semiconductor substrate and connected to the semiconductor element; a first insulation film stacked on an upper face of the first electrode layer; and a second electrode layer stacked over the first electrode layer and the first insulation film, the second electrode layer including a material having a mechanical strength that is higher than a mechanical strength of a material included in the first electrode layer; wherein a groove portion is provided from the upper face in a direction toward a lower face of the first electrode layer, a protrusion portion protruding into the groove portion is provided on a lower face of the second electrode layer, and a lower end of the protrusion portion is positioned below the center position in a thickness direction of the first electrode layer.