Dual-Side Epitaxy for Light-Emitting and Solar Cell Manufacturing
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Solution Overview
Problem
Current methods for manufacturing optoelectronic devices, such as light-emitting and solar cell devices, face challenges in efficiently utilizing a common growth substrate to form both types of devices simultaneously, leading to complex and costly processes.
Innovation Solution
A method involving a common growth substrate with a first and second surface, where a light-emitting epitaxy structure is formed on the first surface, a stripping layer on the second surface, and a solar cell epitaxy structure is grown opposite to the stripping layer, followed by the formation of an adhesive layer and a permanent substrate, allowing for the separate formation of light-emitting and solar cell devices through strategic layer removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate manufacturing processes are used for light-emitting devices and solar cell devices, then each device can be optimized independently, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent combines the manufacturing processes for light-emitting devices and solar cell devices into a single integrated process. Both device types are grown simultaneously on opposite sides of a common semiconductor substrate using epitaxial growth, sharing common process steps including substrate preparation, epitaxial growth conditions, and initial processing steps. This merging eliminates the need for completely separate manufacturing lines while maintaining the ability to optimize each device type independently through selective layer formation and processing.
2Productivity
If a common growth substrate is used for both light-emitting and solar cell devices, then manufacturing efficiency improves, but the process becomes more complex due to simultaneous formation of different device structures
Solution Approach 1:
The patent segments the common substrate into two independent working surfaces, with light-emitting devices formed on one side and solar cell devices on the other. The substrate is divided into separate processing zones where different epitaxial growth conditions and device fabrication steps can be applied independently to each side. This segmentation allows simultaneous production of both device types while maintaining process independence and managing complexity through spatial separation of manufacturing operations.
Solution Approach 2:
The patent transitions from sequential single-sided manufacturing to simultaneous dual-sided manufacturing by utilizing the third dimension (substrate thickness) to accommodate two separate device fabrication processes. By growing devices on opposite faces of the substrate, the process exploits the substrate's dimensional space to enable parallel production, effectively doubling productivity while using the same equipment and process infrastructure.
3Manufacturing precision
If the stripping layer is removed to separate the devices, then individual device quality improves, but the manufacturing process becomes more complex with additional removal steps
Solution Approach 1:
The patent introduces a sacrificial stripping layer as an intermediary element between the light-emitting device and solar cell device structures. This intermediate layer, composed of materials like aluminum arsenide or aluminum gallium arsenide, serves as a temporary bonding interface during manufacturing that can be selectively removed later. The stripping layer enables the devices to be grown together on the same substrate while maintaining the ability to separate them into individual devices through controlled removal of this intermediary layer, thus preserving device quality without permanently complicating the final structure.
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 simplifies the manufacturing process, enabling the simultaneous production of high-quality light-emitting and solar cell devices with reduced complexity and cost, while maintaining the efficiency and sustainability of optoelectronic devices.
Implementation Method 1
forming a light-emitting epitaxy structure on the first surface of the common growth substrate
Data Source
AI summary
A method for manufacturing optoelectronic devices comprising the steps of: providing a common growth substrate; forming a light-emitting epitaxy structure on the common growth substrate; forming a stripping layer on the light-emitting epitaxy structure; forming a solar cell epitaxy structure on the stripping layer; forming an adhesive layer on the solar cell epitaxy structure; proving a solar cell permanent substrate on the adhesive layer; and removing the stripping layer to form a light-emitting device and a solar cell device separately.