Improvements in Efficiency and Stability of Perovskite Solar Cells Using a Cesium Chloride Additive

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Physics

Background:

• High-performance perovskite solar cells (PSCs) require defect-free perovskite films.
• Controlling perovskite film crystallization is crucial for device efficiency and stability.

Purpose of the Study:

• To investigate the effect of cesium chloride (CsCl) as a modulator on perovskite film crystallization.
• To enhance the performance and stability of perovskite solar cells through CsCl doping.

Main Methods:

• Introduction of CsCl into the perovskite precursor solution.
• Characterization of perovskite film properties (crystallinity, phase purity, morphology).
• Fabrication and testing of small-area and 1 cm² PSC devices.

Main Results:

• CsCl doping resulted in dense, homogeneous perovskite films with high crystallinity and preferential orientation.
• Nonradiative recombination was suppressed, significantly increasing carrier lifetime.
• Power conversion efficiency (PCE) increased from 20.56% to 22.86% for small-area devices.
• 1 cm² PSCs achieved a PCE of 21.53% with excellent operational and ambient stability.

Conclusions:

• CsCl doping is an effective strategy for manipulating perovskite crystallization and improving film quality.
• The enhanced film properties translate to higher PCE and improved stability in PSCs.
• CsCl doping offers a reliable approach for developing PSCs suitable for practical applications.