Heterojunction PECVD Chamber Layout for Faster Silicon Film Deposition
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Solution Overview
Problem
The existing solar cell processing technologies face challenges in improving the overall processing efficiency of solar cell wafers, particularly due to the low deposition rate and coupled process parameters in PECVD film deposition, which complicates the optimization of heterojunction solar cell production.
Innovation Solution
A heterojunction solar cell film deposition apparatus is designed with multiple intrinsic and doping process chambers, optimized chamber settings, and a synchronized carrier plate transfer system to improve processing efficiency by reducing waiting times and allowing simultaneous processing of multiple solar cell wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single closed chamber is used for PECVD film deposition, then the process is simpler to operate, but the processing efficiency is low due to sequential processing of multiple layers
Solution Approach 1:
The patent divides the film deposition process into multiple independent chambers: a first PECVD chamber for depositing the intrinsic layer and a second PECVD chamber for depositing the doped layer. This segmentation allows simultaneous processing of different layers in different chambers, eliminating the need to clear and reconfigure a single chamber between layers, thereby significantly improving processing efficiency while maintaining operational simplicity through standardized chamber procedures.
2Manufacturing precision
If process parameters are tightly coupled for optimal film quality, then the film quality is improved, but the deposition time increases due to multiple parameter adjustments
Solution Approach 1:
The patent pre-configures each PECVD chamber with dedicated process parameters optimized for specific film types. The first chamber is pre-set for intrinsic layer deposition parameters, and the second chamber is pre-set for doped layer deposition parameters. This preliminary configuration eliminates the need to adjust multiple parameters during transitions between layers, reducing deposition time while maintaining optimal film quality through parameter specialization.
3Productivity
If multiple layers are deposited in separate chambers, then the processing efficiency is improved, but the device complexity increases due to multiple chambers and vacuum systems
Solution Approach 1:
The patent employs two PECVD chambers with identical or similar configurations, each capable of performing the same film deposition function. This universality means that each chamber is a self-contained, standardized unit with its own vacuum system, gas delivery system, and heating system. The modular, repeatable design reduces overall system complexity compared to a single complex chamber that would need to be reconfigured for different layers, as each chamber operates independently with standardized procedures.
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
The proposed solution enhances the processing efficiency of heterojunction solar cells by reducing deposition time, enabling simultaneous processing of multiple wafers, and improving the quality of the deposited films, which is crucial for commercial mass production.
Implementation Method 1
a heating preheating chamber configured to heat a carrier plate loaded with a solar cell wafer to be processed
Implementation Method 2
Amorphous silicon-based films of intrinsic layer i/doped layer n or intrinsic layer i/doped layer p are deposited on the upper and lower surfaces of crystalline silicon by PECVD technology
Data Source
AI summary
Provided are a heterojunction solar cell film deposition apparatus, method and system, a solar cell, a module, and a power generation system. The heterojunction solar cell film deposition apparatus is configured for amorphous silicon-based film deposition, and comprises a loading cavity, a preheating cavity, intrinsic process cavities, doping process cavities and an unloading cavity that are linearly arranged in sequence, the cavities being isolated from each other by means of an isolating valve. At least two intrinsic process cavities are provided and are configured for deposition by means of an intrinsic layer silicon film process; and at least one doping process cavity is provided and is configured for deposition by means of an N-type silicon film or P-type silicon film process. The preheating cavity comprises a heating preheating chamber and a preheating buffer chamber that is configured for adjusting the gas and pressure atmosphere.