Science 掲載論文(アブストラクトのみ：全文は有料） Accelerated aging of all-inorganic, interface-stabilized perovskite solar cells URL: https://www.science.org/doi/10.1126/science.abn5679
A cap against aging
Accelerated aging tests for perovskite solar cells must take into account several degradation pathways. Zhao et al. found that for all-inorganic cesium lead triiodide (CsPbI3) solar cells, a two-dimensional Cs2PbI2Cl2 capping layer stabilized the interface between the CsPbI3 absorber and the copper thiocyanate hole-transporter layer and boosted its power conversion efficiency to 17.4% (see the Perspective by Habisreutinger and Reese). Accelerated testing at various temperatures up to 110°C and approximately 65% relative humidity revealed an Arrhenius temperature dependence on efficiency degradation. The solar cell should maintain 80% of its efficiency for more than 5 years at 35°C. —PDS
To understand degradation routes and improve the stability of perovskite solar cells (PSCs), accelerated aging tests are needed. Here, we use elevated temperatures (up to 110°C) to quantify the accelerated degradation of encapsulated CsPbI3 PSCs under constant illumination. Incorporating a two-dimensional (2D) Cs2PbI2Cl2 capping layer between the perovskite active layer and hole-transport layer stabilizes the interface while increasing power conversion efficiency of the all-inorganic PSCs from 14.9 to 17.4%. Devices with this 2D capping layer did not degrade at 35°C and required >2100 hours at 110°C under constant illumination to degrade by 20% of their initial efficiency. Degradation acceleration factors based on the observed Arrhenius temperature dependence predict intrinsic lifetimes of 51,000 ± 7000 hours (>5 years) operating continuously at 35°C.