One-step synthesis of a mechanically robust, humidity-stable anti-reflective sub-micron coating with high transparency

< 1.38). Leveraging the nanometer-scale thickness control inherent to the iCVD process, the coating achieved a two-fold reduction in reflectance compared to the bare substrate across the entire visible spectrum. The compositional optimization enabled the pFV film to retain nearly 100% of its original thickness, refractive index, and smooth surface morphology even after the autoclave test (120 °C, 1 h, 0.3 bar). Optical transmittance exceeding 90% was retained over 10 000 bending cycles at a bending radius of 2 mm without crack or delamination. All these results collectively verified the pFV copolymer film as a promising candidate for next-generation AR coatings demanding simultaneous optical performance, moisture resistance, and mechanical robustness.