Synthesis and Study of Janus-Dione-Based Compounds for Ternary Organic Solar Cells

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Organic solar cells (OSCs) utilize electron donor polymers like PM6 and non-fullerene acceptors (NFAs) such as Y6 and ITIC.
• Ternary OSCs incorporate a third material to broaden light absorption and enhance performance.

Purpose of the Study:

• Synthesize novel chromophores based on Janus-dione derivatives (TIIC-1 and TIIC-2).
• Investigate the potential of these materials as ternary components in OSCs.
• Enhance the power conversion efficiency (PCE) of organic solar cells.

Main Methods:

• Synthesis of TIIC-1 and TIIC-2 chromophores.
• Characterization using UV-Vis absorption, cyclic voltammetry, photoemission yield spectroscopy, and photoconductivity.
• Fabrication and testing of PM6:Y7:TIIC-1 ternary organic solar cells.

Main Results:

• Successful synthesis and characterization of TIIC-1 and TIIC-2.
• Incorporation of TIIC-1 into PM6:Y7 bulk heterojunction solar cells.
• Achieved a PCE of 12.5% in ternary cells, an improvement from 11.9% in binary PM6:Y7 cells.

Conclusions:

• The synthesized Janus-dione derivatives show promise as ternary components in OSCs.
• Ternary composition with TIIC-1 facilitates charge transfer via a cascade energy level arrangement.
• Further development of ternary systems can lead to more efficient organic solar cells.