Minimizing Ionic Losses in DMSO-Free Tin-Based Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Lead (Pb)-based perovskite solar cells offer excellent optoelectronic properties but face commercialization challenges due to ion instability and toxicity.
• Tin (Sn)-based perovskites are eco-friendly alternatives with potential for reduced ion-induced instabilities, though detailed investigation is lacking.

Purpose of the Study:

• To investigate mobile species in Sn-based perovskite solar cells.
• To quantify ionic losses and compare them with Pb-based and mixed PbSn devices.
• To assess the stability of Sn-based devices under illumination.

Main Methods:

• Analysis of mobile ion species in Sn-based perovskite solar cells.
• Quantification of ionic losses through device characterization.
• Comparative study with Pb-based and mixed PbSn perovskite solar cells.
• Assessment of device and film stability during prolonged illumination.

Main Results:

• Sn-based perovskite solar cells exhibit over 10-fold lower ion densities compared to Pb-based devices.
• DMSO-free processed Sn samples show minimal ionic losses.
• Pure Sn-based samples demonstrate the lowest ionic losses and sustained stability during illumination.

Conclusions:

• Sn-based perovskite solar cells possess significantly lower ion densities and ionic losses than Pb-based counterparts.
• These findings support the development of stable, eco-friendly thin-film solar cells with reduced ion migration.
• The study enhances understanding of ion migration in Sn-based devices, paving the way for commercialization.