Improvement in stability of perovskite solar cells by adlayer of laser treated FAPbI3 quantum dots

Perovskite solar cells have emerged as a promising technology for renewable energy generation due to their potential of high-efficiency and low-cost fabrication. However, their stability under environmental stressors such as humidity and light exposure remains a critical challenge for widespread commercialization. This study investigates the use of FAPbI₃ quantum dots (QDs) synthesized in a colloidal solution as adlayer on top of the FAPbI₃ bulk light absorbing layer. Our main findings reveal that incorporating such an adlayer composed of FAPbI₃ QDs significantly improves the stability of FAPbI₃ films and devices against humidity and light-induced degradation. Furthermore, it is demonstrated that a femtosecond (fs) laser treatment in a colloidal solution provides significant surface modification of FAPbI₃ QDs. By using such a treated FAPbI₃ QDs as adlayer, the devices exhibit power conversion efficiencies exceeding 20 % with improved stability, highlighting their potential for practical applications. This study offers valuable insights into leveraging QDs and the post laser treatment to enhance the stability and efficiency of FAPbI₃ perovskite solar cells within a monomaterial system, paving the way for the development of durable and high-performance photovoltaic devices.