Trenches in Strained Semiconductor Layers to Block Defect Propagation
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Solution Overview
Problem
Defects and dislocations in semiconductor wafers can propagate through active zones, reducing the yield and reliability of chip production, leading to increased costs and losses due to defective chips.
Innovation Solution
Incorporating trenches etched through the strained layer between defects or dislocations and active zones to prevent their propagation, thereby isolating the active zones from potential damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trenches are etched through the strained layer to prevent defect propagation, then chip reliability is improved, but device complexity increases
Solution Approach 1:
The wafer is segmented by etching trenches that divide the strained layer into isolated regions. These trenches create physical barriers that segment the propagation path of defects and dislocations, preventing them from reaching active zones while maintaining the integrity of functional areas.
Solution Approach 2:
The trenches act as intermediary barrier structures between defects and active zones. These etched regions serve as mediating elements that intercept and block defect propagation paths without directly affecting the active zones, thereby protecting the functional areas while managing the complexity through localized structural modification.
2Productivity
If trenches are etched to isolate active zones from defects, then yield is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The trenches are etched in advance during the wafer fabrication process, before the wafer is diced into individual chips. This preliminary action allows for the establishment of defect barriers early in the manufacturing sequence, ensuring that yield enhancement is achieved through pre-positioned protective structures rather than post-processing interventions.
Solution Approach 2:
The trench etching is applied locally at specific positions where defect propagation paths are identified or anticipated. Rather than uniformly etching the entire wafer, the trenches are strategically placed to provide targeted protection to active zones, thereby enhancing yield while minimizing the overall manufacturing precision burden across the entire wafer surface.
3Productivity
If trenches extend through the strained layer to block defect propagation, then the number of reliable chips increases, but production costs increase
Solution Approach 1:
The trench etching is applied partially, only to the extent necessary to block defect propagation paths to active zones. Rather than etching through the entire wafer thickness or adding excessive protective structures, the trenches are etched to the minimum required depth through the strained layer to achieve effective defect blocking, thereby increasing reliable chip count while controlling production costs.
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
This approach increases the number of reliable chips produced, enhances yield, reduces production losses and costs, and improves chip reliability by effectively blocking defect and dislocation propagation.
Implementation Method 1
The one or more trenches may prevent propagation of the one or more defects or dislocations into the one or more active zones
Data Source
AI summary
A light-emitting device may comprise a set of layers comprising a substrate layer, and a set of epitaxial layers deposited on the substrate layer. The set of epitaxial layers may include a strained layer. The strained layer may include a set of active zones to be used to generate optical gain. The light-emitting device may comprise a set of trenches etched into a subset of the set of layers of the light-emitting device. The set of trenches may prevent a set of defects or dislocations in a wafer from which the light-emitting device was formed from propagating into the set of active zones.