Flexible Solar Cell Grooves That Protect P-N Junction Integrity
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Solution Overview
Problem
Conventional solar panels are rigid, heavy, and fragile, limiting their durability, mechanical resilience, and versatility, and existing methods for producing flexible solar panels can damage the P-N junction interface, reducing efficiency and causing energy losses.
Innovation Solution
The development of solar cells with selective and localized doped regions and metallization layouts that allow for flexible and rollable designs, featuring non-transcending grooves or trenches that enhance mechanical resilience and prevent damage to the P-N junction, along with innovative metallization patterns that enable flexible and durable solar panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rigid solar panel structures are used, then manufacturing and installation are straightforward, but the panels are heavy, fragile, and lack mechanical resilience
Solution Approach 1:
The solar panel is divided into multiple independently supported photovoltaic modules arranged in series. Each module is mechanically separated and supported by its own structure, allowing the panels to be lightweight and flexible while maintaining overall structural integrity through the series arrangement of modules.
2Adaptability or versatility
If flexible solar panel designs are implemented, then versatility and mechanical resilience improve, but existing production methods damage the P-N junction interface
Solution Approach 1:
The photovoltaic modules are pre-assembled with complete P-N junction interfaces before being arranged in series to form the flexible panel. This preliminary assembly ensures that the delicate P-N junctions are established and protected before the flexible configuration is implemented, preventing damage during production.
Solution Approach 2:
The solar panel uses thin-film photovoltaic modules with flexible substrates that maintain the integrity of the P-N junction interface. The flexible design is achieved through thin-film technology rather than conventional rigid structures, allowing bending and flexibility without compromising the semiconductor junctions.
3Power
If series arrangement of photovoltaic modules is used, then voltage output increases, but the complexity of electrical connections increases
Solution Approach 1:
Multiple photovoltaic modules are electrically connected in series by merging their electrical circuits into a single continuous pathway. The modules share common conductive elements and grounding structures, reducing the number of separate connections needed compared to fully independent module connections while maintaining series voltage output.
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 solution results in solar panels that are flexible, mechanically resilient, and capable of withstanding mechanical shocks and thermal changes, while maintaining efficiency and reducing the risk of damage to the P-N junction, allowing for more versatile applications.
Implementation Method 1
Selective and localized region-constrained doping is performed at particular locations of a surface of the solar cell
Implementation Method 2
The photovoltaic (PV) effect is the creation of voltage and electric current in a material upon exposure to light
Data Source
AI summary
Improved flexible solar panels and photovoltaic devices, and methods and systems for producing them. A solar cell has non-transcending grooves or trenches, that penetrate some, but not all, of a silicon layer or semiconductor wafer of the solar cell. The non-transcending grooves or trenches are segmenting the solar cell into regions, and provide flexibility and mechanical resilience. Selective and localized region-constrained doping of an opposite polarity is performed at particular regions or locations of a surface or front region of the solar cell; as well as selective and localized placement of metallized electrical contacts. Grooving or trenching operations can be performed via a dopant-containing layer, to prevent or reduce recombination at or near exposed surfaces. A particular layout of metallization is used for producing electrical contacts or “fingers” that are dashed or segmented or spaced-apart; such that grooving or trenching or segmentation lines are located along non-metallized gaps between adjacent contacts and between adjacent rows of contacts.