Heterojunction Solar Cell Deposition Chambers for Faster PECVD Throughput
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Solution Overview
Problem
The existing solar cell processing technologies face low overall processing efficiency, particularly in the deposition of amorphous silicon-based films for heterojunction solar cells, due to the coupling of process parameters that make it difficult to isolate the impact of deposition rate, leading to long waiting times and inefficient mass production.
Innovation Solution
A heterojunction solar cell film deposition apparatus with multiple chambers, including intrinsic and doping process chambers, is designed to optimize chamber settings, allowing simultaneous processing of multiple solar cell wafers, with controlled gas delivery and pressure, and synchronized carrier plate movement to reduce processing time and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple process chambers are used to deposit different amorphous silicon film layers, then film deposition quality is improved, but processing time increases
Solution Approach 1:
The process chamber is divided into multiple independent deposition chambers (first deposition chamber, second deposition chamber, third deposition chamber), each capable of depositing different amorphous silicon film layers (intrinsic layer, doped layer, etc.). This segmentation allows simultaneous processing of different film layers in parallel chambers, improving overall processing efficiency while maintaining film quality through specialized control in each chamber.
Solution Approach 2:
The system maintains continuous vacuum conditions across all deposition chambers through interconnected vacuum pumping systems. Gas delivery systems continuously supply reactant gases to each chamber, and the carrier plate moves continuously through the chambers without breaking vacuum, enabling uninterrupted film deposition processes across multiple chambers simultaneously.
2Manufacturing precision
If process parameters are tightly controlled to achieve best passivation and doping effects, then film quality is improved, but processing complexity increases
Solution Approach 1:
Different process parameters are optimized and controlled independently in each deposition chamber. The first deposition chamber controls parameters for intrinsic layer deposition, while the second and third chambers control parameters for doped layer deposition. This segmentation allows specialized parameter optimization for each film type without interfering with other processes, reducing overall system complexity.
Solution Approach 2:
The system independently adjusts key parameters including gas flow rates, deposition power density, deposition time, and chamber pressure in each deposition chamber according to the specific requirements of different amorphous silicon film layers. This parameter optimization is achieved through automated control systems that manage the complex multi-parameter space without requiring manual intervention.
3Productivity
If deposition rate is increased to improve processing efficiency, then productivity is improved, but film quality may deteriorate
Solution Approach 1:
The total deposition process is divided into multiple stages across different chambers, each operating at optimized deposition rates. Rather than requiring one chamber to deposit all layers at high speed, each chamber deposits its specific layer at an optimized rate that ensures quality while contributing to overall productivity through parallel operation.
Solution Approach 2:
The continuous movement of the carrier plate through multiple deposition chambers enables overlapping deposition processes. While one chamber completes a deposition cycle, another chamber simultaneously begins its cycle, creating a continuous production flow that maintains high productivity without sacrificing the quality control achieved through optimized deposition rates in each chamber.
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 apparatus enhances processing efficiency by reducing waiting times and enabling simultaneous processing of both sides of solar cell wafers, improving film deposition quality and overall performance, thus supporting higher efficiency and longer service life in solar modules and power generation systems.
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 chamber, a preheating chamber, intrinsic process chambers, doping process chambers and an unloading chamber that are linearly arranged in sequence, the chambers being isolated from each other by means of an isolating valve. At least two intrinsic process chambers are provided and are configured for deposition by means of an intrinsic layer silicon film process; and at least one doping process chamber is provided and is configured for deposition by means of an N-type silicon film or P-type silicon film process. The preheating chamber comprises a heating preheating chamber and a preheating buffer chamber that is configured for adjusting the gas and pressure atmosphere.