Transferring single-crystalline (SC) membranes to flexible substrates has been increasingly studied, enabling emerging functionality and enhanced performance of various devices. A commonly used support-assisted transfer process inevitably leaves dirty residue on material surfaces, limiting the further development of surface-related applications. Here, we scale down the thickness of flexible SC SrRuO₃ (SRO) membranes to 15 nm with a clean surface area of 2.5 × 2.5 mm². This is accomplished by making the polyethylene terephthalate (PET) substrate surface hydrophilic via oxygen plasma treatment, thereby reducing the surface tension. The ultrathin, clean, wide, and flexible SC SRO membranes guarantee a high transmittance of up to 60%, a low resistivity of 10⁻⁴−10⁻³ Ω cm at room temperature, and band ferromagnetism below 150 K with a high magnetic moment of ~0.5 μ_B/Ru at 10 K. The SC-level properties of our SRO membranes imply their potential use in state-of-the-art platforms for next-generation electronics and energy devices.

越来越多地研究将单晶 (SC) 膜转移到柔性基板上，从而实现各种设备的新兴功能和增强性能。常用的支撑辅助转移工艺不可避免地会在材料表面留下脏污残留物，从而限制了表面相关应用的进一步发展。_{在这里，我们将柔性 SC SrRuO 3} (SRO) 膜的厚度缩小到 15 nm，清洁表面积为 2.5 × 2.5 mm ²。这是通过氧等离子体处理使聚对苯二甲酸乙二醇酯 (PET) 基材表面亲水来实现的，从而降低表面张力。超薄、干净、宽且柔韧的 SC SRO 膜保证高达 60% 的高透光率和 10 ^-4 -10的低电阻率^-3 Ω cm 在室温下，带铁磁性低于 150 K，在 10 K 时具有 ~0.5 μ _B /Ru 的高磁矩。我们的 SRO 膜的 SC 级特性意味着它们在最先进的状态下的潜在用途下一代电子和能源设备的艺术平台。