VCSEL Electrode Layout With Single-Step Via Etching
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Solution Overview
Problem
The manufacturing method of vertical cavity surface emitting lasers (VCSELs) is inefficient, with long process times and high metal consumption, leading to high costs and complex processes.
Innovation Solution
A streamlined manufacturing method for VCSELs involving the formation of a semiconductor epitaxial structure with a trench and mesa structure, where the N-type and P-type ohmic metal layers are formed on the same side of the substrate in a single metal deposition process, and passivation layers are etched to create vias in a single etching process, reducing the number of photomasks and metal deposition steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional multi-step metal deposition and etching processes are used, then manufacturing precision can be maintained, but process time increases and productivity decreases
Solution Approach 1:
The patent combines multiple metal deposition steps into a single deposition process, forming both N-type and P-type ohmic metal layers simultaneously. Multiple etching steps are merged into one etching process that creates all necessary vias in a single operation. This merging of operations reduces process time and improves productivity while maintaining manufacturing precision through careful process design.
Solution Approach 2:
The patent performs preliminary actions by forming all metal layers and etching all vias in advance during the same deposition and etching processes, respectively. The N-type and P-type ohmic metal layers are deposited together in a single step, and all vias are etched simultaneously in one process, eliminating the need for repeated cycling and reducing total manufacturing time.
2Reliability
If multiple metal deposition processes are used, then electrode quality can be ensured, but metal consumption increases and cost increases
Solution Approach 1:
The patent merges the deposition of N-type ohmic metal layer and P-type ohmic metal layer into a single metal deposition process. By carefully controlling deposition parameters and using selective masking, both metal layers are formed with appropriate thickness and quality in one operation, reducing metal consumption compared to multiple separate deposition steps.
3Manufacturing precision
If multiple etching processes are used, then via quality can be maintained, but process complexity increases
Solution Approach 1:
The patent combines all via etching operations into a single etching process. By using a carefully designed etching mask and controlling etching parameters, all necessary vias are created in one step, significantly reducing process complexity compared to multiple sequential etching steps while maintaining via quality.
4Reliability
If traditional manufacturing methods are used, then product quality can be ensured, but manufacturing cycle time increases
Solution Approach 1:
The patent merges multiple metal deposition steps into one deposition process and multiple etching steps into one etching process. This consolidation reduces the total number of process steps and manufacturing cycle time while maintaining product quality through careful optimization of the combined processes.
Solution Approach 2:
The patent performs preliminary actions by forming all metal layers and all vias in advance during the same deposition and etching processes, respectively. This eliminates the need for repeated cycling between deposition and etching steps, significantly reducing manufacturing cycle time while ensuring product quality.
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 method significantly reduces the manufacturing cycle time, metal consumption, and costs while improving efficiency by simplifying the process and reducing the number of steps required.
Implementation Method 1
a current confinement layer, and the current confinement layer has an oxide aperture for forming a emitter region of the mesa structure
Implementation Method 2
the semiconductor epitaxial structure includes an N-type ohmic contact layer, an N-type DBR layer, a quantum well layer, a P-type DBR layer, and a P-type ohmic contact layer
Data Source
AI summary
In the manufacturing method of a vertical cavity surface emitting laser, through the same etching process, a first passivation layer located on a side of an N-type ohmic metal layer away from a substrate is etched to form a first via on the side of the N-type ohmic metal layer away from the substrate to expose the N-type ohmic metal layer, and a first passivation layer located on a side of the P-type ohmic contact layer away from the substrate is etched in a mesa structure to form a second via on the side of the P-type ohmic contact layer away from the substrate in the mesa structure to expose the P-type ohmic contact layer.