Subtle Molecular Tailoring Induces Significant Morphology Optimization Enabling over 16% Efficiency Organic Solar
Zichun Zhou1,2, Wenrui Liu1,2, Guanqing Zhou3
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Advanced Materials (Deerfield Beach, Fla.)
|December 10, 2019
Summary
Researchers developed a novel electron acceptor, AQx-2, for organic solar cells (OSCs). This molecular design achieved 16.64% efficiency by optimizing charge generation and morphology.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Efficient charge generation is key for nonfullerene-electron-acceptor-based organic solar cells (OSCs).
- Subtle molecular structure modifications can significantly impact photovoltaic performance.
Purpose of the Study:
- To design and synthesize a novel electron acceptor (AQx-2) for high-efficiency OSCs.
- To establish the structure-morphology-property relationship in OSCs utilizing AQx-2.
Main Methods:
- Synthesis of novel electron acceptor AQx-2.
- Fabrication of binary OSCs using AQx-2 and PBDB-TF donor.
- Morphology analysis and transient absorption spectroscopy.
Main Results:
- Achieved 16.64% power conversion efficiency in binary OSCs with AQx-2.
- Demonstrated improved charge transport due to stronger π-π interactions and balanced mobilities.
- Reduced phase separation in the bulk heterojunction blend enhanced hole transfer and suppressed recombination.
Conclusions:
- Subtle molecular tailoring of electron acceptors can lead to significant performance gains in OSCs.
- Optimized morphology and molecular design are crucial for high-performance organic solar cells.
- AQx-2 represents a promising material for next-generation high-efficiency OSCs.
Keywords:
charge generationnonfullerene acceptorsorganic solar cellspower conversion efficiencysolar cell morphology
