Graphdiyne Derivative as Multifunctional Solid Additive in Binary Organic Solar Cells with 17.3% Efficiency and High...

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Morphology control is crucial for high-efficiency organic solar cells (OSCs).
• Solid additives offer a simple yet underexplored method for morphology tuning in OSCs.
• Limited solid additives have demonstrated significant performance enhancements.

Purpose of the Study:

• To introduce chlorine-functionalized graphdiyne (GCl) as a novel multifunctional solid additive for OSCs.
• To investigate the impact of GCl on blend film morphology and device performance.
• To evaluate the potential of GCl for improving OSC efficiency and batch-to-batch consistency.

Main Methods:

• GCl was synthesized and incorporated as a solid additive into the active layer of OSCs.
• Device performance metrics including power conversion efficiency (PCE), short-circuit current (Jsc), and fill factor (FF) were measured.
• Film morphology, crystallinity, phase separation, charge mobility, and recombination were analyzed.

Main Results:

• OSCs with GCl additive achieved a record power conversion efficiency of 17.3% (certified 17.1%), surpassing control devices (15.6%).
• Introduction of GCl led to enhanced Jsc and FF, attributed to redshifted absorption, improved crystallinity, prominent phase separation, higher mobility, and reduced recombination.
• GCl addition significantly reduced batch-to-batch variations, demonstrating its potential for mass production.

Conclusions:

• GCl is a highly effective multifunctional solid additive for fine-tuning OSC morphology.
• The use of GCl represents a significant advancement in achieving high-efficiency and reproducible OSCs.
• GCl shows promising potential for widespread application in the field of organic solar cells.