A double-cable polymer acceptor enables 20% efficiency in ternary organic solar cells

Area of Science:

• Materials Science
• Polymer Chemistry
• Organic Electronics

Background:

• Organic solar cells (OSCs) require efficient polymer acceptors for high performance.
• Ternary blends offer a strategy to optimize morphology and charge dynamics.
• Developing novel acceptors with improved charge transport and stability is crucial.

Purpose of the Study:

• To synthesize and characterize a new double-cable polymer acceptor, PYT-N.
• To investigate the performance of PYT-N as a third component in organic solar cell blends.
• To understand how PYT-N influences charge transport, recombination, and morphology stability.

Main Methods:

• Synthesis of the double-cable polymer acceptor PYT-N with a Y-series backbone and NDI units.
• Fabrication of ternary organic solar cells using D18:eC9 blends with PYT-N as the third component.
• Characterization of device performance, including power conversion efficiency (PCE).
• Analysis of charge transport, recombination dynamics, and morphology stability.

Main Results:

• The synthesized PYT-N acceptor features a Y-series backbone with pendant NDI units.
• Ternary devices incorporating PYT-N achieved a notable PCE of 20.05%.
• PYT-N incorporation led to enhanced charge transport and suppressed recombination.
• Improved morphology stability was observed due to PYT-N's high glass transition temperature.

Conclusions:

• The double-cable polymer acceptor PYT-N is effective in ternary organic solar cells.
• PYT-N enhances device performance through improved charge dynamics and morphological stability.
• This work demonstrates a promising approach for developing high-efficiency organic solar cell materials.