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Sustainably Synthesized Plasma Encapsulants for Organic Solar Cells With Enhanced Stability Under Harsh Moisture and UV Exposure
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DOI：10.1002/sstr.70560.png)
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Abstract
En 中文
Organic solar cells (OSCs) have achieved rapid efficiency advances; however, limited operational stability remains a key bottleneck for their scalable production and real-world deployment. Here, we develop a green, solvent-free encapsulation strategy using radio-frequency (RF) plasma-polymerized thin films derived from Citrus sinensis (orange oil) and evaluate protection under extreme stress. Two continuous-plasma conditions (70 and 80 W) produced the most effective barrier layers. Under 8 h of water-droplet soaking, encapsulated PM6:Y6 devices retained ~70%–80% of their initial power conversion efficiency (PCE), while nonencapsulated devices failed rapidly. Partial performance recovery after water soaking was observed following mild glovebox annealing, indicating that a portion of the moisture-induced loss is reversible. Moreover, encapsulated OSCs retained >60% of original PCE under continuous UV irradiation (352 nm) for up to 5 days, while reference devices degraded within the first day. Film analyses (UV–vis/Tauc, FTIR, XPS, SEM, and WCA) indicate hydrocarbon-rich networks with minor oxygen incorporation, and UV-induced oxidation that correlates with reduced hydrophobicity. Overall, orange-oil plasma–polymer encapsulation provides a scalable, adhesive- and solvent-free route to improved OSC durability under moisture and UVA stress.
Keywords:
encapsulation
hydrophobicity
organic solar cells
radio frequency plasma
UV stability
water soaking
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