Dual-Donor-Induced Crystallinity Modulation Enables 19.23% Efficiency Organic Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Organic Electronics

Background:

• Trap-assisted charge recombination limits organic solar cell (OSC) performance.
• Reducing traps in the photoactive layer of OSCs is a significant challenge.

Purpose of the Study:

• To investigate PTzBI-dF as a morphology modulator in OSCs.
• To enhance the crystallinity and molecular packing of the active layer.
• To reduce charge recombination and improve photovoltaic performance.

Main Methods:

• Blending PTzBI-dF with D18 derivatives and Y6 in the active layer.
• Analyzing bulk heterojunction crystallinity and molecular packing.
• Evaluating photoluminescence quenching, charge carrier mobilities, and current leakage.
• Fabricating and testing organic solar cell devices.

Main Results:

• PTzBI-dF enhanced active layer crystallinity and molecular packing.
• Improved photoluminescence quenching and reduced trap-assisted recombination.
• Achieved power conversion efficiency exceeding 19%.
• Decreased current leakage, enhanced charge carrier mobilities, and suppressed bimolecular recombination.

Conclusions:

• PTzBI-dF effectively modulates morphology, reducing recombination losses in OSCs.
• Donor phase engineering is a viable strategy for high-performance OSCs.
• PTzBI-dF offers a pathway to advanced crystalline structures and improved device characteristics.