Impact of Silica-Based Packaging on the Performance and Stability of Trans-Perovskite Solar Cells

In this study, an innovative and straightforward packaging strategy utilizing silicone grease was proposed to tackle the long-term stability challenges of perovskite solar cells as well as the complexity associated with current packaging methods. Additionally, its impact on the performance and stability of trans-perovskite solar cells was systematically investigated. Characterization techniques, including UV-Vis absorption spectroscopy, transient photocurrent/voltage spectroscopy, and electrochemical impedance spectroscopy, revealed that the silicone grease encapsulation effectively isolates moisture and oxygen, suppresses perovskite degradation, and passivates interfacial defects, reducing trap density from 7.4×10¹⁵ cm^-3 to 6.6×10¹⁵ cm^-3. The lamination process applies gentle pressure, optimizing physical contact between the perovskite and charge transport layers (ETL/HTL), minimizing interfacial microcracks, and enhancing carrier transport efficiency. Consequently, the transient photovoltage decay time was prolonged from 6.1 ms to 13.2 ms. For inverted PSCs with an ITO/Me-4PACz/PVSK/PCBM/BCP/Ag architecture, the encapsulated devices retained 91.7% of their initial power conversion efficiency (PCE) after 1 500 hours under 25±5 ℃ and 30±5% relative humidity, significantly outperforming unencapsulated counterparts (37.8% PCE retention after 600 hours). This strategy resolves the contradiction between traditional high-temperature encapsulation processes and the chemical sensitivity of perovskite materials, offering combined advantages of high barrier performance, simplicity, and disassemblability. It provides novel insights for the commercial application of perovskite modules and their full life cycle management.