Chemical Passivation and Crystallization Kinetics Regulation for Enhancing Efficiency and Stability of Inverted...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) performance and stability depend critically on perovskite film quality.
• Additive engineering is a key strategy for improving PSCs, but mechanisms and long-term stability effects require further study.

Purpose of the Study:

• To investigate the mechanism of a novel multifunctional organic small molecule, 4-(Methylsulfonyl)benzene-carboximidamide hydrochloride (MSB), as an additive in PSCs.
• To evaluate the effectiveness of MSB in enhancing both the performance and operational stability of perovskite solar cells.

Main Methods:

• Introducing MSB into the perovskite precursor solution.
• Analyzing the interaction between MSB and perovskite precursor components.
• Evaluating the impact of MSB on perovskite film crystallization, defect density, and grain size.
• Assessing the performance and stability of the resulting MSB-based PSCs.

Main Results:

• MSB delayed perovskite crystallization and provided multi-site, long-term passivation through sulfonyl and amidinium groups.
• MSB optimized crystallization, reduced defect density, and increased grain size, releasing internal strain.
• MSB-based PSCs achieved a champion power conversion efficiency (PCE) of 25.17% and demonstrated over 1000 hours of T90 operational stability.
• Enhanced thermal and humidity stability were observed in MSB-modified PSCs.

Conclusions:

• MSB is an effective additive for improving perovskite film quality and device performance.
• The multifunctional nature of MSB enables synergistic effects for enhanced PSC efficiency and long-term operational stability.
• This study offers a promising approach for developing highly stable and efficient perovskite solar cells.