Sol-Gel Glass Coating for PV Module PID Resistance
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Solution Overview
Problem
Photovoltaic (PV) solar modules face potential induced degradation (PID) due to ion mobility caused by environmental factors like humidity and temperature, which degrades the power output, and existing solutions are either costly or impact solar conversion efficiency.
Innovation Solution
A coating is applied to the glass within PV solar modules to reduce ion mobility by increasing electrical surface resistance, acting as a barrier to prevent the ingress of moisture and chemicals, and creating an equipotential between the outside and inside surfaces to eliminate the electrical field driving ion migration, using a sol-gel coating composition with specific silane precursors and additives to enhance hydrophobic and anti-soiling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon nitride cell coatings are engineered to reduce PID effects by increasing density and thickness, then PID resistance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the refractive index and optical properties of the silicon nitride coating to achieve PID resistance without increasing thickness. By adjusting deposition parameters and coating composition, the patent achieves effective PID protection while maintaining process control and reducing manufacturing complexity
Solution Approach 2:
The patent uses composite material structures by combining silicon nitride with other dielectric layers or modifying the silicon nitride composition to create multi-functional coatings that provide both PID resistance and optimal optical performance without requiring increased thickness or complex processes
2Reliability
If the silicon nitride coating thickness is increased to reduce PID, then PID resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the optical parameters of the silicon nitride coating, specifically the refractive index, to achieve effective PID protection at reduced thickness. This parameter optimization allows thinner coatings to provide the same level of protection, directly reducing material and manufacturing costs
3Reliability
If the silicon nitride coating thickness is increased to reduce PID, then PID resistance is improved, but solar conversion efficiency decreases
Solution Approach 1:
The patent optimizes the refractive index parameter of the silicon nitride coating to achieve anti-reflective properties that maximize light absorption. By tuning the optical parameters rather than increasing thickness, the patent simultaneously achieves PID resistance and maintains high solar conversion efficiency
Solution Approach 2:
The patent creates a multi-functional silicon nitride coating that simultaneously provides PID protection, anti-reflective properties for optimal light absorption, and passivation of surface defects. This universal coating eliminates the need for separate functional layers, maintaining efficiency while providing comprehensive protection
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 coating effectively reduces PID by minimizing ion migration, maintaining solar module power output and efficiency while being cost-effective, as demonstrated by enhanced PID resistance in experimental results.
Implementation Method 1
enhance hydrophobic and anti-soiling properties
Implementation Method 2
using a sol-gel coating composition with specific silane precursors
Implementation Method 3
reduces ion mobility by increasing electrical surface resistance, acting as a barrier
Data Source
AI summary
Glass coating materials and methods are disclosed for the coating of glass substrates used in the manufacturer of photovoltaic solar modules such that the coating enhances the reliability of the module by reducing its susceptibility to potential induced degradation (PID). Coating materials are disclosed that reduce soiling on the front surface of the glass; that increase the surface resistivity of the glass and that repel moisture and that seal the surface from the ingress of moisture. Further electrically conductive coatings are disclosed that reduce the electric field between the front and back surfaces of the glass and hence reduce ion mobility within the glass and transport from the interior glass surface to the solar cell. There are additional configuration choices for fine tuning associated with separately optimizing the exterior and interior glass coating. Finally, coating processes and methods are disclosed for coating glass substrates with the disclosed materials.