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Highly Efficient Organic Solar Cells with Improved Vertical Donor-Acceptor Compositional Gradient Via an Inverted
Jiang Huang1,2, Joshua H Carpenter3, Chang-Zhi Li1,4
1Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA.
A new spinning technique creates a vertical morphology gradient in thick organic solar cells. This breakthrough improves both photocurrent and fill factor, achieving high power conversion efficiency.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Bulk heterojunction (BHJ) organic solar cells (OSCs) face a trade-off between photocurrent and fill factor, particularly in thicker active layers.
- Achieving efficient charge generation and transport in thick BHJ films is crucial for high-performance OSCs.
Purpose of the Study:
- To introduce a novel solution fabrication technique for thick BHJ OSCs.
- To overcome the inherent trade-off between photocurrent and fill factor in these devices.
- To enhance the power conversion efficiency (PCE) of OSCs through controlled morphology.
Main Methods:
- Development of an inverted off-center spinning technique for solution processing.
- Fabrication of thick bulk heterojunction organic solar cells using the novel technique.
- Characterization of the resulting donor-acceptor morphology and device performance.
Main Results:
- The inverted off-center spinning technique successfully induced a vertical gradient in the donor-acceptor phase-separated morphology.
- Devices exhibited near 100% internal quantum efficiency (IQE).
- A high power conversion efficiency (PCE) of 10.95% was achieved.
Conclusions:
- The developed spinning technique offers a simple yet effective solution for optimizing morphology in thick BHJ OSCs.
- The vertical morphology gradient is key to simultaneously improving photocurrent and fill factor.
- This method presents a promising pathway for realizing high-performance, efficient organic solar cells.
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