Flip-Chip Laser Diode Contact Layout Using Conductive Reflective Layers
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Solution Overview
Problem
Existing laser diode components with flip-chip design require complex processes involving etching and coating steps, making assembly challenging, especially for advanced components.
Innovation Solution
A laser diode component with a flip-chip design featuring a semiconductor layer stack, first and second semiconductor regions, an active zone, and resonator regions, where the second resonator region includes an electrically conductive reflective layer that connects contacts on the same side, simplifying production by eliminating the need for wafer splitting and allowing for easier integration into ICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flip-chip design is implemented with contacts on the same side, then assembly is simplified and integration into ICs is easier, but the production process becomes more complex requiring additional etching and coating steps
Solution Approach 1:
The patent applies preliminary action by forming the second reflective layer with electrical conductivity during the initial growth of the semiconductor layer stack, before any contact structures are created. This pre-established conductive path eliminates the need for subsequent complex etching and coating steps that would otherwise be required to create electrical connections in a flip-chip design, thus simplifying the overall production process while maintaining assembly ease
2Ease of manufacture
If a flip-chip design is implemented with contacts on the same side, then integration into ICs and mounting on carriers is simplified, but further etching and coating steps are required
Solution Approach 1:
The patent merges multiple functions into the second reflective layer by making it electrically conductive during the growth process. This single layer simultaneously provides optical reflection and electrical conduction, combining what would traditionally require separate components and process steps. This merging reduces the total number of etching and coating steps needed while facilitating easier integration into ICs and mounting on carriers
3Device complexity
If the second reflective layer is made electrically conductive, then contact elements can be arranged on the same side simplifying flip-chip design, but the layer must serve dual functions of reflection and conduction
Solution Approach 1:
The patent applies universality by designing the second reflective layer to perform multiple functions simultaneously: it provides optical reflection for the laser cavity and serves as an electrical conduction path for contact elements. This multi-functional layer allows contact elements to be arranged on the same side (simplifying flip-chip design) while maintaining both optical and electrical performance requirements
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 solution enables a less complex and faster production process while maintaining efficient electrical contact and reflectivity, facilitating integration into various applications such as AR/VR, projection, and lighting systems.
Implementation Method 1
The second, electrically conductive reflective layer electrically conductively connects the at least one first contact element to the first semiconductor region or the at least one second contact element to the second semiconductor region
Implementation Method 2
The first resonator region comprises a first reflective layer arranged on the at least one semiconductor layer stack. The second resonator region comprises a first reflective layer and a second, electrically conductive reflective layer
Data Source
AI summary
A laser diode component includes a semiconductor layer stack having first and second semiconductor regions, and an active zone between the first and second semiconductor regions. The laser diode component also includes a first contact structure including a first contact element. The laser diode component further includes a second contact structure including a second contact element. The second contact element is on the same side of the laser diode component as the first contact element. The laser diode component additionally includes a resonator including a first resonator region having a first reflective layer on the semiconductor layer stack, and a second resonator region having a first reflective layer and a second, electrically conductive reflective layer, each arranged on the semiconductor layer stack. The second, electrically conductive reflective layer connects the first contact element to the first semiconductor region or the second contact element to the second semiconductor region.