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Phosphotungstate-Based Anode Interfacial Material for Constructing High-Performance Polymer Solar Cells with a Fill
Lingwei Feng1, Shihao Chen1, Kai Zhang1
1Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou510640, P. R. China.
ACS Applied Materials & Interfaces
|January 20, 2023
Summary
Researchers developed a novel anode interfacial layer using zinc phosphotungstate (ZnPW) for organic solar cells (OSCs). This ZnPW modification significantly boosted power conversion efficiency and stability compared to traditional PEDOT/PSS layers.
Area of Science:
- Materials Science
- Renewable Energy
- Organic Electronics
Background:
- Interfacial layers are crucial for carrier extraction and recombination suppression in organic solar cells (OSCs).
- Anode interfacial materials have received less attention compared to cathode counterparts.
- Developing effective anode interfacial layers is key to improving OSC performance.
Purpose of the Study:
- To introduce a polyoxometalate-based inorganic molecular cluster, zinc phosphotungstate (ZnPW), as a novel anode interfacial layer for OSCs.
- To evaluate the performance enhancement of OSCs using ZnPW compared to conventional PEDOT/PSS.
- To investigate the mechanisms behind the improved performance and stability.
Main Methods:
- Fabrication of organic solar cells using a PM6/EH-HD-4F/L8-BO-F ternary system.
- Modification of the anode interfacial layer with zinc phosphotungstate (ZnPW).
- Performance characterization including power conversion efficiency (PCE) and fill factor.
- Analysis of charge dynamics, energy level alignment, and stability.
Main Results:
- The ZnPW-modified OSCs achieved a high PCE of 18.67% and a fill factor of 80.29%.
- These results surpassed the performance of devices using PEDOT/PSS (PCE of 18.01%).
- ZnPW modification led to enhanced light absorption, optimized energy level matching, reduced contact resistance, and suppressed charge recombination.
- Improved photostability and storage stability were observed in ZnPW-modified devices.
Conclusions:
- Zinc phosphotungstate (ZnPW) is a promising inorganic nanocluster for use as an anode interfacial layer in OSCs.
- ZnPW effectively enhances both the power conversion efficiency and operational stability of organic solar cells.
- This work highlights the potential of polyoxometalate-based materials in advancing OSC technology.
