Moisture Stability of Perovskite Solar Cells Processed in Supercritical Carbon Dioxide

Performance degradation under environmental conditions currently limits the practical utility of perovskite-based solar cells. The moisture stability of CH3NH3PbI3 perovskite films and solar cells was measured during exposure to three different levels of relative humidity. The films were crystallized at two different temperatures with and without simultaneous exposure to supercritical carbon dioxide. The film crystallinity, optical absorption, and device photoconversion efficiency was measured over time for three relative humidity levels and both crystallization methods. It was determined that film crystallization in supercritical CO2 resulted in significant improvement in moisture stability for films processed at 50 degrees C, but negligible improvement in stability for films processed at 100 degrees C.

Automated summary

The study found that crystallizing perovskite films in supercritical CO2 can significantly improve moisture stability, especially for films processed at 50 degrees C. However, the stability improvement is negligible for films processed at 100 degrees C.