Hybrid Laser Amorphous Bonding Layer Without Annealing
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Solution Overview
Problem
Hybrid semiconductor lasers face challenges in high-volume manufacturing due to the difficulty in achieving clean, smooth bonding surfaces using molecular O2 plasma-assisted wafer bonding, leading to unbounded areas and increased costs from annealing processes.
Innovation Solution
A bonding process using an amorphous group IV material, such as amorphous silicon or amorphous germanium, is applied at room temperature in a vacuum environment to bond the light-emitting layer and waveguide layer without the need for vertical trenches or annealing, forming a strong and reliable bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If molecular O2 plasma-assisted wafer bonding is used to bond III-V active region to silicon substrate, then bonding strength is improved, but manufacturing complexity and cost increase due to required annealing process and vertical trenches
Solution Approach 1:
The patent removes the oxide bonding layer and annealing step from the conventional hybrid laser fabrication process. By directly bonding the III-V active region to the silicon substrate without an intermediate oxide layer, the process eliminates the need for complex annealing procedures and vertical trench formation, thereby reducing manufacturing complexity while maintaining bonding strength
Solution Approach 2:
The patent applies preliminary surface treatment to the III-V active region and silicon substrate before bonding to ensure clean, oxide-free surfaces. This preliminary cleaning action prevents oxide formation that would otherwise require subsequent annealing, thus simplifying the overall process while achieving strong bonds
2Reliability
If annealing process is used to form intermediate-strength bond, then bonding reliability is improved, but fabrication time and cost increase
Solution Approach 1:
The patent replaces the thermal annealing process with a direct mechanical bonding approach. By using clean, oxide-free surfaces and applying pressure directly to the bonding interface, the process achieves reliable bonds without the time-consuming thermal treatment, thereby reducing fabrication time while maintaining bonding reliability
Solution Approach 2:
The patent skips the annealing step entirely by establishing strong bonds through direct contact of prepared surfaces. This eliminates the 40-60 minute annealing process, significantly reducing fabrication time while achieving comparable or superior bonding reliability through proper surface preparation
3Manufacturing precision
If vertical trenches are made in silicon component to diffuse hydrogen, then bonding quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the vertical trench structure from the silicon substrate by using a planar bonding approach. By eliminating the need for hydrogen diffusion through trenches, the process simplifies manufacturing while achieving high bonding quality through direct surface contact and proper interface preparation
4Strength
If clean, smooth bonding surfaces are required for hydrophilic bonding, then bonding strength is improved, but manufacturing difficulty and cost increase in high volume production
Solution Approach 1:
The patent changes the bonding mechanism from hydrophilic (oxide-based) to direct semiconductor-to-silicon contact. This parameter change allows the use of standard cleaning procedures rather than requiring ultra-clean, oxide-free surfaces, making the process more suitable for high-volume manufacturing while maintaining bonding strength
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 reduces fabrication time and cost while improving the reliability of hybrid lasers by eliminating the need for annealing and vertical trenches, resulting in a more robust and efficient bonding process.
Implementation Method 1
A bonding process using an amorphous group IV material, such as amorphous silicon or amorphous germanium, is applied at room temperature in a vacuum environment to bond the light-emitting layer and waveguide layer
Data Source
AI summary
Described herein are IC devices that include hybrid lasers formed with a bonding layer. Hybrid lasers include an active light-emitting region coupled to a waveguide. In a hybrid laser, the waveguide and the light-emitting regions are formed separately from different materials, e.g., the waveguide is a single-crystal silicon, and the light-emitting region includes III-V semiconductors. An amorphous group IV material, such as silicon or germanium, is advantageously used to bond the light-emitting region to the waveguide.