DL-Serine Hydrazide Hydrochloride Multiple-site Synergy Induced Effective and Stable Formamidine-Rich Perovskite...

Area of Science:

• Materials Science
• Renewable Energy
• Chemistry

Background:

• Solar cell efficiency and stability are crucial for commercial viability.
• Formamidine-cesium perovskite offers excellent thermal stability and high power conversion efficiency potential.
• Iodine release during aging, especially under light, degrades perovskite solar cells.

Purpose of the Study:

• To introduce DL-Serine Hydrazide Hydrochloride as a multi-site passivation agent in formamidine-cesium perovskite solar cells.
• To investigate the mechanism of DL-Serine Hydrazide Hydrochloride in preventing iodine escape and reducing defects.
• To evaluate the impact of DL-Serine Hydrazide Hydrochloride on the efficiency and stability of perovskite solar cells.

Main Methods:

• Incorporation of DL-Serine Hydrazide Hydrochloride into the perovskite precursor solution.
• Chemical analysis of iodine reduction and defect passivation mechanisms.
• Performance testing of perovskite solar cells under continuous illumination and varying humidity conditions.

Main Results:

• DL-Serine Hydrazide Hydrochloride addition resulted in a champion power conversion efficiency of 22.22%.
• The modified cells maintained 85.88% of their initial efficiency after 7000 seconds of 1-sun illumination at 40% relative humidity.
• Devices exhibited enhanced stability in air environments with 50%-60% relative humidity.

Conclusions:

• DL-Serine Hydrazide Hydrochloride effectively passivates multiple sites in formamidine-cesium perovskite solar cells.
• The compound inhibits iodine escape and reduces defects, significantly improving device stability.
• This approach offers a low-cost strategy for developing more stable and efficient perovskite solar cells.