Organic Solar Cell Surface Heterojunction Active Layer
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Solution Overview
Problem
The efficiency of organic solar cells with a single active layer is low due to limited interfaces between donor and acceptor materials, leading to increased series resistance and decreased fill factor, while bilayer or blended structures face challenges in effective electron-hole transfer and recombination.
Innovation Solution
An organic solar cell with a surface heterojunction active layer is developed, where nanostructured acceptor particles are partially embedded in a donor layer, increasing the interface area for smooth electron and hole transfer, utilizing P3HT or similar materials for the donor layer and PCBM or ICMA/ICBA for acceptor particles, with specific dimensions and shapes to enhance interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single active layer is used in organic solar cells, then the device structure is simple and manufacturing is easy, but the efficiency is low due to limited interfaces between donor and acceptor materials
Solution Approach 1:
The patent segments the acceptor material into discrete nanostructured particles (0.1-10 micrometers in size) rather than using a continuous blended layer. This segmentation creates numerous individual donor-acceptor interfaces throughout the active layer, dramatically increasing the total interface area while maintaining a relatively simple single-layer structure that is easy to manufacture using solution processing techniques.
Solution Approach 2:
The patent applies local quality by creating regions with high concentrations of acceptor particles embedded within the donor layer. This localized arrangement ensures that electron-hole separation occurs efficiently at multiple discrete sites throughout the active layer, improving overall device efficiency without requiring complex multi-layer structures.
2Productivity
If bilayer or blended structures are used to increase interfaces, then the efficiency may improve, but the series resistance increases and fill factor decreases due to carrier break and dead end formation
Solution Approach 1:
By segmenting the acceptor into discrete particles rather than using continuous blended layers, the patent eliminates the formation of continuous resistive pathways that cause dead ends. Each particle interface provides a localized electron-hole separation site with direct pathways to electrodes, reducing series resistance and improving fill factor while maintaining high efficiency.
Solution Approach 2:
The discrete acceptor particles act as intermediaries that facilitate efficient charge separation and transport. Each particle serves as an independent interface where electrons are transferred to the acceptor and holes remain in the donor, creating clear separation pathways that avoid the carrier break and dead end problems associated with blended structures.
3Productivity
If nanostructured particles are partially embedded in the donor layer, then the interface area increases for smooth electron and hole transfer, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the acceptor material as discrete nanostructured particles with controlled sizes (0.1-10 micrometers) before incorporating them into the donor layer. This pre-preparation simplifies the overall manufacturing process, as the particles can be directly embedded into the active layer using standard solution processing techniques without requiring complex in-situ formation methods.
Solution Approach 2:
The patent utilizes parameter changes by controlling the size, shape, and concentration of acceptor particles to optimize interface area while maintaining manufacturability. By adjusting particle dimensions (0.1-10 micrometers) and embedding depth (partially embedded), the patent achieves high interface area with relatively simple processing, balancing performance improvement with manufacturing complexity.
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 configuration improves current density by 30% and fill factor by 25%, and photoelectric conversion efficiency by 60% compared to traditional blending methods, reducing the 'dead island' phenomenon and enhancing overall energy transfer efficiency.
Implementation Method 1
a plurality of nanostructured particles are acceptors in a donor layer due to the hydrophobic phenomenon occurred among the donor layer and the nanostructured particle acceptors
Implementation Method 2
The solar cell can transform the solar energy into electrical energy based on the photoelectric effect of materials. The photoelectric effect is the phenomenon that light shines into the material to increase conductive carriers. In terms of the semiconductor materials, as the energy of the light is larger than the energy gap of the semiconductors, the free elector-hole pairs are generated in the interior
Implementation Method 3
If an internal electric field is applied at this time, the carriers will be quickly led out before vanished. The internal electric field is generated in the joint interface between p-type and n-type semiconductors, and a so-called solar cell uses the internal electric field to extract effectively the current to induce the electricity
Data Source
AI summary
The invention relates to an organic solar cell having surface heterojunctions active layer and a method for manufacturing the same. The organic solar cell comprises a glass substrate, a first electrode, a first transmission layer, an active layer, a second transmission layer and a second electrode. The first electrode is formed on the glass substrate. The first transmission layer is formed on the first electrode. The active layer is deposited on the first transmission layer. The second transmission layer is formed on the active layer, and the second electrode is formed on the second transmission layer. The active layer comprises a donor layer and a plurality of acceptor particles partially embedded in a surface of the donor layer. By hydrophobic phenomenon occurred among the donor layer and the acceptors, the interface enables to be increased to transfer the electron and hole without obstacles for promoting the efficiency of the organic solar cell.