Publication date: 17th February 2025
Flexible perovskite solar cells (PSCs) have garnered significant interest owing to their lightweight nature, high power-to-weight ratio, and prospective uses in wearable electronics. However, the efficiency and mechanical durability of inverted p-i-n flexible PSCs are strongly influenced by the carrier extraction and transport properties of the hole transport layer. This study presents the passivation strategy of flexible perovskite solar cells by integrating a polyoxometalate (H3PW12O40 ) layer at the interface between the hole-transport layer and the perovskite (buried interface). This integration enhances surface properties and mitigates interfacial defects, leading to an increase in device power conversion efficiency (PCE) to 19.08% under simulated one sun (AM 1.5G, 100 mW/cm²) for flexible PSCs and 30% for low light conditions (1000lx, 2700K). Furthermore, the mechanical durability of the flexible perovskite solar cells is enhanced due to a robust adhesion between the perovskite and hole transport layer materials. The findings underscore the potential of polyoxometalate materials for effective energy harvesting and resilient flexible perovskite solar cells, facilitating its application in wearable devices.
This research was supported by the National Research Council of Science & Technology (NST) grant by the Korean government (2710019293) and the Fundamental Research Program of the National Research Foundation of Korea (RS-2024-00429694).
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