Flexible GaN Solar Cells via Sacrificial Substrate Transfer
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Solution Overview
Problem
Current GaN-based solar cells are limited by their rigid substrate structure, which restricts the development of flexible solar cells and requires high-temperature semiconductor processes, limiting substrate selection and device alignment.
Innovation Solution
A method of manufacturing solar cells involves stacking GaN-based device layers on a sacrificial substrate, etching, and transferring them onto a flexible substrate using a stamping processor, allowing for high-temperature processing and alignment, while using a tandem structure of silicon and GaN layers for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rigid substrate such as silicon or sapphire is used for GaN-based solar cells, then high-temperature semiconductor processes can be performed and good alignment is achieved, but the solar cells cannot be made flexible and substrate selection is limited
Solution Approach 1:
The manufacturing process is segmented into two distinct stages: (1) fabricating solar cell devices on a rigid sacrificial substrate using high-temperature semiconductor processes, and (2) transferring the fabricated devices to a flexible receiving substrate. This segmentation allows each stage to utilize the most appropriate substrate properties - rigidity for fabrication stability and flexibility for final application.
Solution Approach 2:
A sacrificial substrate acts as an intermediary medium during the manufacturing process. It provides the necessary rigidity and thermal stability for high-temperature semiconductor processing, then is removed after the solar cell devices are fabricated, allowing the devices to be transferred to the flexible receiving substrate.
2Manufacturing precision
If high-temperature semiconductor processes are used for manufacturing GaN-based solar cells, then good device alignment and manufacturing precision are achieved, but substrate selection is extremely limited
Solution Approach 1:
The process separates the high-precision fabrication stage (requiring rigid substrate for thermal stability and alignment) from the final application stage (requiring flexible substrate). This allows high-temperature processes to be performed on the sacrificial substrate without constraining the flexibility of the final solar cell product.
Solution Approach 2:
The substrate properties are changed through the manufacturing process - starting with a rigid sacrificial substrate that can withstand high temperatures, then transitioning to a flexible receiving substrate after device fabrication. This parameter change enables both high-precision manufacturing and flexible final product.
3Stability of the object's composition
If solar cell devices are fabricated directly on flexible substrates, then flexibility is achieved, but high-temperature processing is limited and manufacturing precision decreases
Solution Approach 1:
The solar cell devices are preliminarily fabricated on a rigid sacrificial substrate where high-temperature processes and precise alignment can be achieved, before being transferred to the flexible receiving substrate. This preliminary action on the rigid substrate enables manufacturing precision that would be difficult to achieve directly on flexible substrates.
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 enables the production of flexible solar cells with superior alignment and efficiency, overcoming substrate limitations and enabling large-area, economical manufacturing.
Implementation Method 1
contacting the solar cell devices to a stamping processor to remove the solar cell devices from the sacrificial substrate; and transferring the solar cell devices onto a receiving substrate
Data Source
AI summary
Provided are a solar cell and a method of manufacturing the same. The method of manufacturing the solar cell includes stacking a solar cell device layer containing GaN on a sacrificial substrate, etching the solar cell device layer to expose the sacrificial substrate, thereby forming one or more solar cell devices comprising the solar cell device layer, anisotropically etching the exposed sacrificial substrate, contacting the solar cell devices to a stamping processor to remove the solar cell devices from the sacrificial substrate, and transferring the solar cell devices onto a receiving substrate. A high temperature semiconductor process may be performed on a substrate such as a silicon substrate to transfer the solar cell devices onto the substrate, thereby manufacturing flexible solar cells. Also, a large number of solar cells may be excellently aligned on a large area. In addition, economical solar cells may be manufactured.