Highly stable, solution-processable phenothiazine derivative as hole collection material for organic solar cells

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Organic solar cells (OSCs) require efficient hole collection materials for improved performance and stability.
• Existing materials like PEDOT:PSS face challenges with long-term air stability.
• Modifying electrode work functions is crucial for enhancing electron blocking capabilities in OSCs.

Purpose of the Study:

• To synthesize and characterize a novel solution-processable phenothiazine derivative, 4-phenothiazin-10-yl-anisole (APS).
• To evaluate APS as a hole collection material in organic solar cells (OSCs).
• To assess the impact of APS on device efficiency, work function modification, and air stability.

Main Methods:

• Synthesis of 4-phenothiazin-10-yl-anisole (APS).
• Fabrication of inverted organic solar cells (OSCs) utilizing APS as a hole collection layer.
• Characterization of APS's optical and electronic properties.
• Performance testing of OSC devices, including power conversion efficiency (PCE) and stability under ambient conditions.

Main Results:

• APS exhibits unique optical and electronic properties suitable for hole collection.
• APS effectively modifies the work function of indium tin oxide (ITO) electrodes, enhancing electron blocking.
• Devices incorporating APS demonstrate high air stability, outperforming those with PEDOT:PSS.
• An inverted OSC device based on APS achieved a power conversion efficiency (PCE) of 3.56%.

Conclusions:

• 4-phenothiazin-10-yl-anisole (APS) is a promising, air-stable hole collection material for organic solar cells.
• APS enhances OSC performance by improving electron blocking and long-term stability.
• The study highlights APS as a viable alternative to conventional materials like PEDOT:PSS for OSC applications.