Elongated PV Cell Layout for Edge Degradation
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Solution Overview
Problem
Thin-film photovoltaic (TFPV) modules are susceptible to rapid degradation due to moisture and reactive gases, leading to efficiency reduction and impedance changes, with edge-related degradation being a major contributor to module failure.
Innovation Solution
The design of photovoltaic devices with elongated photovoltaic cells positioned inside an active area, where the average distance from the cells to the edges is greater than the cell's characteristic width, minimizing edge-related degradation and distributing degradation evenly among cells, thus extending the module's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photovoltaic cells are positioned close to the edges of the active area to maximize active area utilization, then the total output power is improved, but the degradation from moisture and environmental factors increases
Solution Approach 1:
The patent applies local quality by creating a non-uniform spatial distribution of photovoltaic cells within the active area. Specifically, cells are positioned such that their distance from the edges varies, with greater distance from edges providing better protection against moisture and environmental degradation. This spatially varying protection strategy allows the system to balance between maximizing active area utilization and minimizing degradation risks.
2Duration of action of stationary object
If special water-impermeable polymers are used to increase moisture diffusion time, then the module's lifetime is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the photovoltaic cells from the high-risk edge regions of the active area and positions them in more protected interior regions. By removing cells from the most vulnerable locations (the edges), the design reduces moisture exposure without requiring additional complex protective materials. This spatial repositioning strategy achieves extended lifetime through geometric arrangement rather than material complexity.
3Productivity
If the active area is maximized to increase power output, then the productivity is improved, but the edge-related degradation affects a larger portion of the cells
Solution Approach 1:
The patent changes the spatial parameters of cell positioning within the active area. By adjusting the distance parameters between cells and edges, and between adjacent cells, the design optimizes the balance between active area utilization and degradation protection. The specific parameter guidance (average distance greater than characteristic width) provides a quantitative criterion for achieving this optimization.
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 design significantly reduces edge-related degradation, leading to a longer operational life and maintaining a higher efficiency of the photovoltaic module by minimizing the impact of environmental factors on the cells, ensuring a substantial portion of the module remains functional throughout its projected lifetime.
Implementation Method 1
PV-based renewable-energy sources generate energy, in the form of electricity, by harnessing electromagnetic radiation, such as sunlight
Data Source
AI summary
A degradation-resistant photovoltaic device is provided. The device includes an active area and at least one photovoltaic cell located in the active area. The photovoltaic cell has an elongated shape with a characteristic width and a characteristic length. The characteristic length is greater than the characteristic width and an average distance from the photovoltaic cell to any edge of the active area is greater than the characteristic width.