Defect Passivation and Stress Release Strategies for Inverted Perovskite Solar Cells Based on the...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells (PSCs) show promise due to excellent optoelectronic properties.
• Defects and residual stress in perovskite films hinder performance and stability.
• Addressing these limitations is crucial for advancing PSC technology.

Purpose of the Study:

• To investigate the effect of 3-methylthio-1-propylammonium bromide (3MeSPABr) as an additive in perovskite precursor solutions.
• To improve the power conversion efficiency (PCE) and stability of PSCs.
• To understand the interaction mechanism of 3MeSPABr with the perovskite film.

Main Methods:

• Fabrication of inverted PSCs using a low-pressure-assisted solution process.
• Incorporation of 3MeSPABr into the perovskite precursor solution.
• Characterization of perovskite film properties and device performance.

Main Results:

• The additive 3MeSPABr effectively passivates defects and alleviates residual tensile stress in the perovskite film.
• PSCs with 3MeSPABr achieved a high power conversion efficiency (PCE) of 21.99%.
• The additive enhanced the hydrophobicity of the perovskite film, leading to improved device stability.

Conclusions:

• 3MeSPABr is an effective additive for improving the performance and stability of PSCs.
• The strong coordination and hydrogen bonding interactions of 3MeSPABr play a key role in defect passivation and stress alleviation.
• This study offers a promising strategy for developing high-efficiency and stable perovskite solar cells.