Flip Chip Laser Diode Thermal Management via Direct Bonding
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Solution Overview
Problem
Conventional laser diodes using non-metal substrates, such as sapphire, face challenges with heat dissipation, leading to inefficient performance due to difficulties in releasing heat generated during operation.
Innovation Solution
A flip chip type laser diode design featuring current conducting layers on both sides of a ridge mesa, with a larger second electrode for direct bonding to a package substrate with high thermal conductivity, enhancing heat dissipation and current transmission with low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-metal substrates such as sapphire are used, then cost is reduced, but heat dissipation performance deteriorates
Solution Approach 1:
The patent introduces a metal substrate as an intermediary component between the semiconductor layers and the final mounting surface. This metal substrate serves as a thermal conductor to efficiently dissipate heat generated during laser diode operation, while the semiconductor layers are directly formed on this metal substrate, creating a flip-chip structure that prioritizes thermal management over traditional substrate material choices.
2Device complexity
If conventional bonding wire connections are used, then device structure is simplified, but reliability deteriorates due to disconnection issues
Solution Approach 1:
The patent merges the electrical connection function and mechanical support function into a single integrated structure. The metal substrate directly supports the semiconductor layers and provides electrical connections through integrated electrode structures, eliminating the need for separate bonding wires. This consolidation improves reliability by removing potential failure points while maintaining structural efficiency.
3Productivity
If heat dissipation is improved through better substrate material, then working efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the device into distinct functional layers: the metal substrate handles thermal management and mechanical support, while the semiconductor layers (first semiconductor layer, emitting layer, second semiconductor layer) handle light generation. This clear functional segmentation allows each layer to be optimized independently for its specific purpose, improving overall working efficiency without significantly increasing manufacturing complexity.
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
Improves heat dissipation efficiency and working performance by transmitting heat through a larger second electrode and reducing disconnection issues, thereby enhancing device reliability.
Implementation Method 1
transmitting heat through a larger second electrode
Implementation Method 2
current conducting layers on both sides of a ridge mesa, with a larger second electrode for direct bonding to a package substrate with high thermal conductivity, enhancing heat dissipation and current transmission with low resistance
Data Source
AI summary
A flip chip type laser diode includes a substrate, a first semiconductor layer, an emitting layer, a second semiconductor layer, at least one current conducting layer, a patterned insulating layer, at least one first electrode and a second electrode. The first semiconductor layer is disposed on the substrate. The emitting layer is disposed on a part of the first semiconductor layer. The second semiconductor layer is disposed on the emitting layer and forms a ridge mesa. The current conducting layer is disposed on a part of the first semiconductor layer. The patterned insulating layer covers the first semiconductor layer, the emitting layer, a part of the second semiconductor layer and a part of the current conducting layer. The first electrode and the second electrode are disposed on areas of the current conducting layer and the second semiconductor layer which are not covered by the patterned insulating layer.