Defect Passivation in Perovskite Solar Cells Using Polysuccinimide-Based Green Polymer Additives.

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Physics

Background:

• Perovskite solar cells (PSCs) require defect control for improved efficiency and stability.
• Surface defects and grain boundaries in perovskite films hinder device performance.

Purpose of the Study:

• To investigate the use of green polymers, polysuccinimide (PSI) and polyasparagine (PASP), for modifying perovskite films.
• To enhance the efficiency and stability of PSCs by passivating defects using polymer additives.

Main Methods:

• Perovskite films were modified by incorporating PSI and PASP.
• Characterization included SEM, XRD, FTIR, and UV-Vis spectroscopy.
• Photovoltaic performance and stability of the modified PSCs were evaluated.

Main Results:

• PSI incorporation led to defect passivation and improved perovskite film morphology.
• PSCs with PSI achieved power conversion efficiencies (PCE) up to 20.1%.
• PSI-modified PSCs retained over 80% efficiency after 40 days of unencapsulated storage.

Conclusions:

• Green polymers, particularly PSI, are effective in passivating surface defects in perovskite films.
• Polymer modification offers a viable strategy for enhancing PSC performance and stability.
• This approach contributes to the development of more durable and efficient perovskite solar cells.