Compressive Strain Engineering via Sucrose‐Assisted Encapsulation for Perovskite Solar Cells

As an emerging photovoltaic technology, perovskite solar cells (PSCs) suffer from inherent instability, which limits their commercial viability. Conventional encapsulation methods can improve the stability of sensitive materials in PSCs through isolation. This work describes a strategy to improve the stability of PSCs by introducing sucrose material during the encapsulation process. After solidifying from the molten state, sucrose binds tightly at the interface and generates compressive strain within the device. This compressive strain method can effectively mitigate light‐induced degradation, inhibit ion migration, and improve the stability of the device for long‐term operation. Compared to the unencapsulated and paraffin‐encapsulated controls, the sucrose‐encapsulated PSCs retain 98.6% of their initial efficiency after 1200 h of storage in the dark (20 ± 5°C, 10% RH) and exhibit superior performance under accelerated light–dark cycling. This simple method, based on a widely available material, provides a promising solution for enhancing the durability and commercial potential of PSC technology.