Substrate Reuse in Light-Emitting Devices via Sacrificial Layer
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Solution Overview
Problem
The existing methods for manufacturing light-emitting devices do not effectively reuse substrates, leading to waste and increased costs, while also potentially compromising the quality of subsequent semiconductor layers due to contamination and oxidation.
Innovation Solution
A method involving the formation of a nucleation layer and a sacrificial layer on a substrate, followed by the separation of a semiconductor stack using a selective etching solution, allowing for the reuse of the substrate and subsequent recycling of the nucleation layer to maintain high-quality epitaxial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If substrates are not reused in existing manufacturing methods, then substrate quality and cleanliness are maintained, but production costs increase and waste is generated
Solution Approach 1:
The patent implements substrate recovery by separating the semiconductor stack from the substrate using a sacrificial layer, enabling the substrate to be cleaned and reused for subsequent device fabrication while the sacrificial layer is discarded. This resolves the contradiction by recovering valuable substrates without compromising their quality for future use.
Solution Approach 2:
The patent segments the substrate structure into three distinct layers: the reusable substrate, the sacrificial layer, and the semiconductor stack. This segmentation allows selective removal of the sacrificial layer to separate the semiconductor stack from the substrate, enabling substrate reuse while maintaining its integrity and quality.
2Ease of manufacture
If substrates are reused without proper separation, then production costs decrease, but contamination and oxidation compromise semiconductor layer quality
Solution Approach 1:
The patent applies preliminary action by forming the sacrificial layer before fabricating the semiconductor stack. This pre-positioned sacrificial layer serves as a separation interface that enables clean detachment of the semiconductor stack from the substrate after fabrication, preventing contamination during the separation process and ensuring substrate readiness for reuse.
Solution Approach 2:
The sacrificial layer acts as an intermediary between the substrate and the semiconductor stack. It facilitates the separation process by providing a controlled interface that can be selectively removed, allowing the semiconductor stack to be detached without damaging the substrate or introducing contamination, thus enabling cost-effective substrate reuse.
3Productivity
If conventional manufacturing methods are used, then process simplicity is maintained, but substrate reuse capability is lost
Solution Approach 1:
The patent introduces segmentation by dividing the substrate structure into distinct functional layers (substrate, sacrificial layer, semiconductor stack). This segmentation enables substrate reuse by allowing selective separation of the semiconductor stack from the substrate through sacrificial layer removal, improving productivity without excessive complexity.
Solution Approach 2:
The sacrificial layer serves as an intermediary that enables substrate reuse functionality. By introducing this intermediate layer, the patent achieves substrate recyclability and improved productivity while maintaining relatively simple manufacturing processes, as the sacrificial layer can be removed using standard wet or vapor HF etching techniques.
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 enables the cost-effective production of light-emitting devices with high reproducibility and quality by reusing substrates, reducing waste and contamination issues, and maintaining the integrity of the semiconductor layers.
Implementation Method 1
separating the semiconductor stack from the nucleation layer by removing the sacrificial layer with a selective etching solution
Data Source
AI summary
A method for making a light-emitting device is provided. The method comprises the steps of providing a substrate, forming a nucleation layer on the substrate, forming a semiconductor stack on the nucleation layer, and separating the semiconductor stack from the nucleation layer to expose the nucleation layer.