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Conjugated Polymer-Halogenated Alkane Synergy: 19.37% Efficiency in Binary Organic Solar Cells.
Tianhuan Huang1, Nan Weng1, Qiaogan Liao1
1School of Business, School of Materials Science and Engineering, School of Mechanical and Electrical Engineering, Guangxi Key Laboratory of Information Materials, Engineering Research Center of Electronic Information Materials and Devices (Ministry of Education), Guilin University of Electronic Technology, Guilin, Guangxi, P. R. China.
The synergistic use of conjugated polymer PM6 and 1,8-diiodooctane (DIO) additive enhances organic solar cell (OSC) morphology, boosting power conversion efficiency and long-term stability.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Morphological instability in organic solar cells (OSCs) limits performance and operational stability.
- Controlling the active layer microstructure is crucial for efficient organic photovoltaics.
Purpose of the Study:
- To investigate the synergistic mechanism of conjugated polymer PM6 and 1,8-diiodooctane (DIO) additive.
- To understand their effect on the microstructure and photovoltaic performance of D18:BTP-BO-4F based OSCs.
- To explore strategies for improving OSC efficiency and stability.
Main Methods:
- Systematic investigation of the synergistic effects of PM6 and DIO on OSC active layers.
- Analysis of microstructural changes, including phase separation and molecular aggregation.
- Evaluation of photovoltaic performance metrics (PCE, Voc, Jsc, FF) and operational stability.
Main Results:
- Co-introduction of PM6 and DIO refined phase separation morphology and donor-acceptor aggregation.
- Enhanced nanoscale domain connectivity improved carrier transport and extraction.
- Significant inhibition of monomolecular and bimolecular recombination losses observed.
- Power conversion efficiency increased from 16.68% to 19.37% with improved device parameters.
- Devices retained over 90% of initial efficiency after 60 days of storage.
Conclusions:
- The synergy between conjugated polymers and additives is critical for regulating active layer morphology.
- This approach offers a robust and scalable strategy for simultaneously enhancing OSC efficiency and stability.
- Optimized morphology leads to reduced recombination and improved charge carrier dynamics.
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