Solar Cell ARC Protection Layer Sequential Deposition
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Solution Overview
Problem
The existing processes for solar cell fabrication are complex and costly due to the need for multiple processing steps and tools, particularly in forming and protecting anti-reflective coatings, which increases time and expense.
Innovation Solution
A method where an anti-reflective coating layer and a protection layer, composed of materials like amorphous carbon or silicon, are formed sequentially in the same process chamber, eliminating the need for additional tools and reducing handling, thereby simplifying the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate processing steps and tools are used to form and protect anti-reflective coatings, then the quality and integrity of the coating can be maintained, but the fabrication time and cost increase significantly
Solution Approach 1:
The patent combines the formation of the anti-reflective coating and the protection layer into a single sequential deposition process within one processing chamber. The anti-reflective coating is deposited first, followed immediately by the protection layer without removing the substrate from the chamber. This merging of steps eliminates intermediate handling and reduces fabrication time while maintaining coating integrity through continuous processing.
Solution Approach 2:
The protection layer is formed in advance as a preliminary step before subsequent processing steps that may expose the anti-reflective coating to damage. By depositing the protection layer immediately after the anti-reflective coating while the substrate is still in the processing chamber, the coating is pre-protected against potential damage from etching, cleaning, or other processing steps that follow.
2Reliability
If multiple separate processing steps and tools are used to form and protect anti-reflective coatings, then the coating can be properly formed and protected, but the fabrication cost increases
Solution Approach 1:
The patent merges the deposition of the anti-reflective coating and protection layer into a single processing sequence within one chamber, eliminating the need for separate tools and intermediate substrate handling. This reduces equipment costs, reduces the number of processing tools required, and lowers overall fabrication costs while maintaining proper coating formation and protection.
Solution Approach 2:
The processing chamber is used for multiple functions: depositing the anti-reflective coating, depositing the protection layer, and potentially performing subsequent processing steps. This multi-functionality reduces the need for specialized equipment for each step, thereby reducing capital equipment costs and simplifying the manufacturing process.
3Manufacturing precision
If the substrate is removed from the process chamber between deposition steps, then each layer can be formed with precise control, but the number of handling operations increases
Solution Approach 1:
The patent combines multiple deposition steps into a single continuous process within the same processing chamber. The anti-reflective coating and protection layer are deposited sequentially without removing the substrate, eliminating intermediate handling operations while maintaining precise deposition control through controlled atmosphere and process parameters within the chamber.
4Manufacturing precision
If multiple processing tools are used for different fabrication steps, then each step can be optimized independently, but the overall process complexity increases
Solution Approach 1:
The patent employs a single processing chamber that performs multiple functions: depositing the anti-reflective coating, depositing the protection layer, and potentially conducting subsequent processing steps. This multi-functional approach reduces the total number of processing tools required while maintaining process optimization through controlled deposition parameters and sequential processing within the same environment.
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 reduces the number of processing steps, decreases fabrication time, and lowers costs by integrating the deposition of the anti-reflective and protection layers, while maintaining the integrity of the anti-reflective coating and improving yield through reduced substrate handling.
Implementation Method 1
An anti-reflective coating (ARC) layer is then formed, in the process chamber, above the light-receiving surface of the substrate. Without removing the substrate from the process chamber, a protection layer is then formed above the ARC layer.
Data Source
AI summary
A method for fabricating a solar cell is described. The method includes first providing, in a process chamber, a substrate having a light-receiving surface. An anti-reflective coating (ARC) layer is then formed, in the process chamber, above the light-receiving surface of the substrate. Finally, without removing the substrate from the process chamber, a protection layer is formed above the ARC layer.