Edge Processing of Photovoltaic Glass Substrates
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Solution Overview
Problem
Current methods for processing multiple coated substrates in photovoltaic module production are inefficient, particularly in high-volume automated processing, which affects the durability and quality of the coatings.
Innovation Solution
A high-temperature activation process involving edge grinding, washing, batching, and thermal processing of glass substrates with ceramic rollers, followed by annealing in a controlled atmosphere to enhance coating robustness and reduce defects, is implemented to improve substrate processing efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current methods of processing multiple coated substrates are used, then production can proceed with simple equipment, but processing efficiency is low and coating durability is compromised
Solution Approach 1:
The processing method is segmented into distinct sequential steps: edge shaping, washing, batching, thermal processing, and stacking. Each step is optimized independently to ensure both efficiency and coating durability, with specific parameters for temperature, time, and atmosphere control in the thermal processing stage.
Solution Approach 2:
Edge shaping is performed as a preliminary action before thermal processing to prepare the substrate edges. This preliminary preparation prevents defects during subsequent processing stages and ensures proper positioning and handling of substrates throughout the production line.
2Productivity
If high-volume automated processing is implemented, then productivity increases, but coating quality and durability deteriorate
Solution Approach 1:
A controlled atmosphere (inert or reducing atmosphere) is introduced as an intermediary medium during thermal processing to protect the organic-inorganic hybrid coating from oxidation and degradation. This mediator enables high-volume processing while maintaining coating integrity through controlled chemical environment.
Solution Approach 2:
Processing parameters are precisely controlled and optimized: temperature range (500-700°C), time duration (1-30 minutes), and atmosphere composition. These parameter changes enable automated high-volume processing while maintaining consistent coating quality through reproducible thermal treatment conditions.
3Strength
If thermal processing is applied to enhance coating robustness, then coating strength improves, but processing time and energy consumption increase
Solution Approach 1:
The thermal processing parameters (temperature, time, atmosphere) are optimized to achieve the minimum effective treatment duration. By controlling the atmosphere and using appropriate temperature ranges, the coating achieves robustness in 1-30 minutes rather than longer conventional times, reducing energy consumption and processing time.
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 method results in more robust and defect-reduced coating layers, leading to improved carrier concentration and performance of photovoltaic modules by optimizing the annealing conditions and handling techniques.
Implementation Method 1
The glass substrates may then be processed in a thermal processing chamber (e.g., a high-temperature low-oxygen roller hearth), after which the glass may be inspected
Implementation Method 2
The annealing may include heating one or more glass substrates above about 300 degrees C. The annealing may include heating one or more glass substrates below about 800 degrees C.
Implementation Method 3
The loading may include placing the one or more glass substrates on one or more ceramic rollers. The thermal processing chamber may include the one or more ceramic rollers.
Implementation Method 4
The edges of the glass substrates may be processed for durability using an edge shaping process (e.g., edge grinding)
Implementation Method 5
The glass substrates may then be washed or accumulated in an enclosure for rinsing the substrates
Implementation Method 6
A conveyor may then be used to group the glass substrates into any suitable sized batch, including, for example, batches of 1 or more, 2 or more, or 3 or more
Implementation Method 7
The glass substrates may then be processed in a thermal processing chamber (e.g., a high-temperature low-oxygen roller hearth)
Implementation Method 8
The stacking may include positioning each one of the one or more glass substrates vertically adjacent to one another such that a coated surface does not contact a bottom surface of a vertically adjacent substrate
Data Source
AI summary
A method for processing a coated glass substrate may include a high-temperature activation process.