Integrated Bypass Diode for Organic Solar Cells Under Partial Shading
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Solution Overview
Problem
Optoelectronic components, such as solar cells, face efficiency losses and potential degradation due to partial shading, leading to irreversible damage and reduced service life, especially in large-area modules, where individual cell failures are economically and cost-intensively problematic.
Innovation Solution
Integration of an integrated bypass diode within the optoelectronic module, arranged either as a sandwich structure or alongside the organic cells, with careful layer structuring and post-treatment to minimize optical impact and enhance current flow during shading, allowing for efficient energy conversion and extended module lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bypass diodes are retrofitted to modules in conventional thin-film photovoltaics, then the service life under partial shading is improved, but the production cost increases and the process becomes more complex
Solution Approach 1:
The bypass diode is integrated directly into the module structure during manufacturing, merging the diode function with the module assembly process. This eliminates the need for separate retrofitting steps and reduces overall system complexity while maintaining the protective function against partial shading damage.
Solution Approach 2:
The bypass diode is installed during the initial module production phase rather than being added later as a retrofit. This preliminary integration ensures the protective function is built-in from the start, simplifying the overall process by combining multiple steps into one manufacturing sequence.
2Loss of energy
If two cover layers are applied to electrodes in the bypass diode area, then the bypass diode does not generate current under illumination, but the manufacturing process becomes more complex and less suitable for roll-to-roll production
Solution Approach 1:
The problematic cover layers that prevented roll-to-roll manufacturing are removed from the process. Instead, the bypass diode is integrated in a way that is compatible with continuous manufacturing processes, eliminating the need for additional complex layering steps while maintaining functional performance.
Solution Approach 2:
The manufacturing approach is changed from applying multiple cover layers to using a simplified integration method compatible with roll-to-roll processes. This parameter change in the manufacturing process maintains the electrical isolation function while dramatically improving ease of manufacture.
3Device complexity
If shaded cells are left without protection, then the module structure remains simple, but concentrated current flow through defects causes local overheating and irreversible degradation
Solution Approach 1:
The bypass diode provides protective cushioning against the harmful effects of partial shading before damage can occur. By diverting excess current away from shaded cells, the diode prevents concentrated current flow and local overheating, cushioning the system against irreversible degradation while maintaining structural simplicity.
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 integrated bypass diode maintains high efficiency and extends the service life of optoelectronic components under partial shading conditions without significantly impairing the optical surface, enabling cost-effective production and maintenance of large-area modules.
Implementation Method 1
The bypass diode, which is arranged in parallel with one or more organic cells, enables a higher current flow in the reverse direction of the organic cell at a given voltage in the case of (partial) shading
Implementation Method 2
The integrated bypass diode according to the invention having a low current flow at Vmpp causes the corresponding optoelectronic cell of the optoelectronic component and a high current flow when the corresponding optoelectronic cell of the optoelectronic component is loaded backwards
Data Source
AI summary
The invention relates to organic components for converting light into electrical energy, comprising integrated bypass diodes, which are integrated into the optoelectronic stack, in order to increase the efficiency and the service life of the optoelectronic component in the case of partial shading/shading of individual cells or cell segments. Said components can also be produced for large-area applications in the roll-to-roll method.