GaN Laser Diode Wafer Transfer for Higher Die Density
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Solution Overview
Problem
Current blue and green laser diode technologies face challenges due to high cost, inefficiency, and fragility, particularly in the manufacturing of GaN-based laser diodes, which require costly free-standing substrates and are sensitive to temperature, limiting their broader deployment.
Innovation Solution
A method for fabricating gallium and nitrogen-containing laser diodes using epitaxial deposition and transfer to a carrier wafer, allowing for the expansion of epitaxial material to increase the number of diodes per substrate, reducing costs, and integrating the carrier wafer as a submount for direct packaging, thereby minimizing additional processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If free-standing GaN substrates are used for manufacturing blue and green laser diodes, then the laser performance and reliability are improved, but the manufacturing cost increases significantly
Solution Approach 1:
The patent uses inexpensive silicon carbide substrates as disposable carrier substrates for epitaxial growth, replacing expensive free-standing GaN substrates. The silicon carbide substrates serve their purpose during manufacturing and are then discarded, enabling cost-effective production while maintaining laser performance through proper epitaxial layer design
Solution Approach 2:
The patent introduces silicon carbide substrates as intermediary carrier substrates that facilitate the epitaxial growth of GaN-based laser structures. These intermediary substrates enable manufacturing on cheap substrates while producing high-quality laser devices, acting as a mediator between cost constraints and performance requirements
2Productivity
If multiple dice are transferred to a carrier wafer with expanded pitch, then the number of diodes per substrate increases and cost decreases, but the manufacturing process complexity increases
Solution Approach 1:
The patent divides the manufacturing process into distinct stages: epitaxial growth on carrier substrates, dice formation, dice transfer to final substrates, and final packaging. This segmentation allows each stage to be optimized independently, managing complexity while enabling high-volume production through systematic process breakdown
Solution Approach 2:
The patent performs preliminary epitaxial growth and dice formation on carrier substrates before final transfer and packaging. By preparing dice in advance on intermediate carriers, the process enables efficient batch manufacturing and reduces the complexity of direct single-step production
3Ease of manufacture
If carrier wafer is integrated as submount for direct packaging, then additional processing steps are minimized and manufacturing is simplified, but the design flexibility is reduced
Solution Approach 1:
The patent designs the carrier substrate to serve multiple functions: as the growth substrate during epitaxial manufacturing, as a temporary carrier during dice transfer, and as the final submount for packaging. This multi-functionality simplifies the overall manufacturing process by eliminating the need for separate submounts while maintaining design flexibility through standardized interface designs
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 reduces the cost of blue-light emitting GaN-based laser diodes to a competitive level with LEDs, enabling wider market penetration and simplifies the manufacturing process by maximizing substrate utilization and reducing the need for expensive substrates.
Implementation Method 1
forming epitaxial material overlying the surface region, the epitaxial material comprising an n-type cladding region, an active region comprising at least one active layer overlying the n-type cladding region
Data Source
AI summary
A method for manufacturing a laser diode device includes providing a substrate having a surface region and forming epitaxial material overlying the surface region, the epitaxial material comprising an n-type cladding region, an active region comprising at least one active layer overlying the n-type cladding region, and a p-type cladding region overlying the active layer region. The epitaxial material is patterned to form a plurality of dice, each of the dice corresponding to at least one laser device, characterized by a first pitch between a pair of dice, the first pitch being less than a design width. Each of the plurality of dice are transferred to a carrier wafer such that each pair of dice is configured with a second pitch between each pair of dice, the second pitch being larger than the first pitch.