Separable Semiconductor Substrate Buffer Layer for Large-Area Crystallinity
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Solution Overview
Problem
Existing methods for manufacturing separable semiconductor substrates are costly and complicated, and they struggle to produce large-area substrates with high crystallinity.
Innovation Solution
A method involving the formation of a buffer layer with carbon and aluminum nitride on a substrate, followed by the growth of a compound semiconductor layer that can be self-separated, using a process that includes carbonization, nitridation, and the growth of aluminum nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photolithography process is used for inserting pattern, then separation can be achieved, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The invention extracts the separation function from complex photolithography processes and implements it through a simple buffer layer insertion method. The buffer layer is inserted between the substrate and compound semiconductor layer to enable stress-induced separation without requiring photolithography patterns, thereby reducing process complexity while maintaining separation capability.
Solution Approach 2:
The invention changes the separation mechanism from pattern-based photolithography to stress-based separation using thermal expansion coefficient differences. By utilizing the parameter difference in thermal expansion coefficients between the buffer layer and surrounding materials, the system achieves separation through thermal stress during cooling, eliminating the need for complex photolithography processes.
2Reliability
If buffer layer is inserted for separation, then separation can be achieved, but manufacturing cost increases
Solution Approach 1:
The invention changes the separation approach from expensive photolithography to cost-effective buffer layer insertion. The buffer layer is designed with specific thermal expansion properties that enable stress-induced separation during normal cooling processes, eliminating the need for expensive photolithography equipment and materials while maintaining reliable separation capability.
Solution Approach 2:
The buffer layer acts as a disposable intermediate component that enables separation and can be removed or left in place depending on requirements. This simple, low-cost buffer layer replaces expensive photolithography processes, providing an economical solution for substrate separation in compound semiconductor manufacturing.
3Reliability
If buffer layer is inserted for separation, then separation can be achieved, but manufacturing of large-area substrates becomes difficult
Solution Approach 1:
The invention changes from pattern-based separation to uniform buffer layer-based stress separation. The buffer layer is inserted across the entire large-area substrate and utilizes thermal expansion coefficient differences to generate uniform stress during cooling, enabling separation across large areas without the limitations of photolithography pattern scalability.
Solution Approach 2:
The invention segments the substrate structure by inserting a buffer layer between the substrate and compound semiconductor layer. This segmentation creates a distinct interface that facilitates stress-induced separation, allowing large-area substrates to be separated uniformly across their entire surface without relying on photolithography patterns.
4Reliability
If buffer layer is inserted for separation, then separation can be achieved, but crystallinity deteriorates
Solution Approach 1:
The invention changes the separation mechanism from pattern-based methods that may damage crystals to stress-based separation using thermal expansion differences. The buffer layer generates controlled stress during cooling that facilitates separation without causing mechanical damage or deteriorating the crystallinity of the compound semiconductor layer.
Solution Approach 2:
The buffer layer acts as an intermediary that mediates the separation process. It absorbs and distributes thermal stress uniformly, enabling clean separation at the buffer layer interface without transmitting damaging stresses to the compound semiconductor crystal structure, thereby preserving crystallinity while achieving separation.
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 allows for the cost-effective and efficient manufacturing of large-area compound semiconductor substrates with improved crystallinity, enabling easy separation of the semiconductor layer and reducing production costs.
Implementation Method 1
The separation method by inserting a buffer layer uses stress induced by a difference in thermal expansion coefficient during cooling
Data Source
AI summary
The present invention relates to a method of manufacturing a separable semiconductor substrate, and a thin film device and composite device manufactured by the same, and the method of manufacturing a separable semiconductor substrate according to an embodiment of the present invention includes providing a substrate and forming a buffer layer including carbon and aluminum nitride.