CIGS Vapor Transport Deposition Susceptor Heating
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Solution Overview
Problem
Current methods for manufacturing Copper-Indium-Gallium-Selenide (CIGS) thin films for solar cells face challenges such as high production costs, non-uniform compositional issues, and inefficiencies in achieving high-quality, large-area solar cells due to inadequate deposition techniques.
Innovation Solution
The use of Vapor Transport Deposition (VTD) or Gas Assisted Growth (GAG) techniques with a specifically designed apparatus that includes controlled heating tubes and carrier gas systems to deposit CIGS layers and other materials like NaF, buffer layers, and transparent conducting oxides, allowing for more efficient and uniform material distribution on substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional deposition techniques are used to deposit CIGS thin films, then production cost is reduced, but material uniformity and film quality deteriorate
Solution Approach 1:
A susceptor is introduced as an intermediary component between the heat source and the substrate. The susceptor absorbs electromagnetic energy (microwave or RF) and converts it to thermal energy, providing uniform heating to the substrate. This mediator enables controlled, uniform temperature distribution across the substrate surface, which is critical for achieving uniform CIGS film deposition while maintaining cost-effective processing
Solution Approach 2:
The patent replaces conventional thermal conduction-based heating systems with electromagnetic field-based heating (microwave or RF heating). This substitution allows for rapid, uniform, and controllable heating of the substrate without direct contact, improving temperature uniformity and deposition quality while reducing processing time and cost
2Device complexity
If conventional deposition techniques are used, then equipment complexity is reduced, but film quality and deposition efficiency deteriorate
Solution Approach 1:
Conventional contact-based heating and deposition systems are replaced with electromagnetic field-based heating (microwave or RF susceptor heating) and vapor transport deposition. This substitution eliminates complex mechanical contact systems while providing superior temperature control and uniformity, resulting in high-quality CIGS films with consistent composition and morphology
Solution Approach 2:
The patent utilizes electromagnetic field parameters (microwave frequency, RF power, susceptor material properties) to control the heating and deposition process. By adjusting these parameters, uniform temperature distribution and controlled material deposition are achieved, improving film quality without requiring complex mechanical control systems
3Device complexity
If conventional deposition techniques are used, then equipment simplicity is maintained, but material utilization efficiency deteriorates
Solution Approach 1:
The susceptor acts as a mediator that enables efficient energy transfer and uniform heating, allowing for precise control of the deposition process. This controlled environment reduces material waste by ensuring uniform material distribution across the substrate and minimizing unwanted byproducts or incomplete deposition
Solution Approach 2:
The vapor transport deposition process with susceptor heating enables continuous and controlled material deposition. The electromagnetic heating maintains optimal temperature conditions throughout the process, ensuring complete reaction and minimal material loss, while the system can operate continuously for large-area substrate processing
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 production costs, enhances material utilization, and improves the quality and uniformity of CIGS thin films, enabling the production of larger solar cells with increased efficiency and reduced material loss.
Implementation Method 1
heating the heating tube thereby vaporizing the CIG powder and turning the CIG powder into CIG vapor
Implementation Method 2
applying a portion of first carrier gas into the first feeder tube wherein the first carrier gas carries the CIG powder into the first heating tube
Implementation Method 3
providing one or more thermal sources to heat the housing and the heating tube
Data Source
AI summary
An apparatus for deposition of a plurality of elements onto a solar cell substrate that comprises: a housing; a transporting apparatus to transport the substrate in and out of the housing; a first tubing apparatus to deliver powders of a first elements to the housing; a first source material tube located outside of the housing and joined to a feeder tube of the tubing apparatus; a valve located inside of the first source material tube sufficient to block access between the first source material tube and the first feeder tube; a first heating tube located inside of the housing and connected to the first feeder tube; a similar second tubing apparatus to deliver powders of a second elements to the housing; a loading station for loading the substrate onto the transporting apparatus; one or more thermal sources to heat the housing and the first and second heating tube.