Flexible vanadium dioxide (VO₂) thermochromic films show great potential for large-scale fabrication and possess broader applications compared with VO₂ coatings on rigid substrates. However, the fabrication of flexible VO₂ films remains a challenge so far, leading to the scarcity of research on flexible VO₂ films for smart windows. With the aim to obtain a flexible VO₂-based films with excellent optical properties and a long service life, we designed and successfully fabricated a flexible ITO/VO₂/ITO (IVI) film on the colorless transparent polyimide substrate, which could be directly attached to glasses for indoor temperature modulation. This flexible IVI film effectively enhances the luminous transmittance (T_lum) and solar modulation ability (ΔT_sol) (15 and 68% increase relative to a VO₂ single layer), reduces the thermal emissivity (ε_T) (50.7% decrease relative to a VO₂ single layer), and exhibits better durability than previously reported structures. Such excellent comprehensive performance offers it great potential in practical applications on smart windows. This work is supposed to provide a new strategy for facile direct fabrication of flexible VO₂ films and broaden the applications of flexible VO₂ in more coatings and devices.

中文翻译：

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溅射柔性 VO2 薄膜以实现有效的热调制

_{与刚性基材上的VO 2}涂层相比，柔性二氧化钒（VO ₂）热致变色薄膜显示出大规模制造的巨大潜力并具有更广泛的应用。然而，迄今为止，柔性VO ₂薄膜的制造仍然是一个挑战，导致对用于智能窗户的柔性VO _{2薄膜的研究稀缺。}为了获得具有优异光学性能和长使用寿命的柔性VO _{2基薄膜，我们设计并成功制造了柔性ITO/VO 2}/ITO（IVI）薄膜在无色透明聚酰亚胺基板上，可直接贴在玻璃上用于室内温度调节。这种柔性 IVI 薄膜有效地提高了透光率 ( T _lum ) 和太阳调制能力 (Δ T _{sol )（相对于 VO 2}单层增加了 15% 和 68% ），降低了热发射率 (ε _T )（相对于 VO 2 减少了 50.7% VO ₂单层），并表现出比以前报道的结构更好的耐用性。如此优异的综合性能使其在智能窗的实际应用中具有巨大的潜力。这项工作应该为灵活直接制造柔性VO _{2提供一种新的策略。}薄膜并拓宽柔性VO ₂在更多涂层和设备中的应用。