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Updated: Jun 11, 2025

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
Constraining the Excessive Aggregation of Non-Fullerene Acceptor Molecules Enables Organic Solar Modules with the
Erming Feng1, Chujun Zhang1, Jianhui Chang1
1Hunan Key Laboratory for Super-microstructure and Ultrafast Process, School of Physics, Central South University, Changsha 410083, China.
Scalable processing of organic solar cells (OSCs) is advanced by understanding thin-film formation. Optimized doctor-blading suppresses aggregation, enhancing morphology and efficiency for industrial applications.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Advancing organic photovoltaics (OPVs) requires translating high-performance organic solar cell (OSC) materials from lab-scale spin-coating to industrial-scale processing.
- Understanding the structural formation dynamics within the photoactive layer during printing is crucial for bridging the gap between laboratory research and industrialization.
Purpose of the Study:
- To explore the intricate mechanisms governing thin-film formation in the PM6:L8-BO photovoltaic system during doctor-blading.
- To investigate the influence of printing-compatible solvents on structural dynamics and morphological properties.
Main Methods:
- Utilized doctor-blading with two printing-compatible solvents.
- Investigated the synergistic influence of donor polymer PM6 and high-boiling-point solvents on L8-BO structural dynamics.
- Optimized processing strategy to control thin-film formation and morphology.
Main Results:
- Identified synergistic effects of PM6 and high-boiling-point solvents on L8-BO structural dynamics and morphology.
- Optimized processing suppressed L8-BO aggregation during slow drying, enhancing crystallization and molecular orientation.
- Achieved improved charge transport, reduced defects and recombination, boosting upscaling potential.
Conclusions:
- Optimized PM6:L8-BO OSCs achieved 18.42% efficiency in small-area devices and 16.02% in modules.
- Demonstrated the interplay between thin-film formation kinetics, structure dynamics, and device performance in scalable processing.
- Provided valuable insights for advancing scalable manufacturing of organic solar cells.
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