Mitigating Carrier and Energy Losses via Interface Modulator Toward High-Performance Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy

Background:

• Interface engineering is crucial for reducing energy losses in perovskite solar cells (PSCs).
• Optimizing the interface between perovskite and hole transport layers is key to improving device performance and stability.

Purpose of the Study:

• To design and synthesize a novel molecule, C-DPT, for interface engineering in PSCs.
• To investigate the effect of C-DPT as an interface modulator on PSC performance and stability.

Main Methods:

• Synthesis of a multifunctional hole-selective molecule (C-DPT) combining methoxy-triphenylamine-carbazole and diphenyl-triazine units.
• Fabrication and characterization of PSCs using C-DPT as an interface modulator.
• Theoretical and experimental analysis of interfacial properties, including contact, trap density, and carrier extraction.

Main Results:

• C-DPT modification resulted in a flatter heterojunction, reduced trap density, and faster hole extraction.
• The C-DPT molecule demonstrated compatible contact and favorable perovskite binding, leading to defect restoration and improved carrier transport.
• C-DPT-modified PSCs achieved a champion power conversion efficiency of 24.02%.

Conclusions:

• C-DPT effectively enhances interfacial properties in PSCs, boosting performance.
• The modified PSCs exhibit significantly improved long-term stability under ambient, thermal, and humidity stress.