19.36 % Efficiency in Binary Organic Solar Cells with Amine-Hydroxy-Substituted Perylene Diimide-Based Interface...

Area of Science:

• Materials Science
• Energy Science
• Organic Electronics

Background:

• Organic solar cells (OSCs) are a promising renewable energy technology.
• Cathode interfacial materials (CIMs) are crucial for efficient charge extraction and device performance.
• High-polarity functional groups in CIMs improve interfacial contact and reduce power loss.

Purpose of the Study:

• To develop a novel CIM for enhanced OSC performance.
• To investigate the effect of a hydrogen-bonding interfacial material on cathode work function and charge mobility.
• To evaluate the efficiency and stability of OSCs incorporating the new CIM.

Main Methods:

• Synthesis of hydroxyethylamine-functionalized perylene diimide (PDIN-OH).
• Fabrication of OSC devices using PDIN-OH as the CIM.
• Characterization of device performance, including power conversion efficiency (PCE) and stability.
• Analysis of interfacial properties and charge carrier dynamics.

Main Results:

• PDIN-OH effectively reduced cathode work function and improved interfacial contact.
• OSCs with PDIN-OH achieved high PCEs of 17.51% (PM6:Y6) and 19.36% (D18:L8-BO).
• The material demonstrated excellent conductivity and tolerance to thick active layers, enhancing device stability.

Conclusions:

• PDIN-OH is a highly effective CIM for improving OSC performance and stability.
• The hydrogen-bonding nature and doping interaction of PDIN-OH contribute to its superior performance.
• This work presents a promising strategy for developing advanced CIMs for practical OSC applications.