The nanopatterning of the surfaces of polymer substrates enhances the performances of photovoltaics. Ultraflexible organic photovoltaics (OPVs) are one of the promising energy harvesters for wearable electronics. A reduction in incident light angle dependence while maintaining the power conversion efficiency (PCE) is desirable for wearable electronics devices in which the angle of incident light continuously changes due to the deformation of the device. However, the nanopatterning of the ultrathin polymer substrates of ultraflexible OPVs using the reported methods is challenging because they fatally damage the substrates. Here, the fabrication of ultraflexible OPVs having a low incident light angle dependence while maintaining a PCE of 10.5% by developing ultrathin nanograting polymer substrates is reported. The nanograting‐patterned fluorinated polymer enables the formation of periodic nanograting structures onto the back surface of a 1 µm thick polymer substrate having a pitch of 760 nm and a height of 100 nm, while the opposite surface remains flat after the formation of the planarization layer. Furthermore, with the nanopatterning of the ultrathin substrate, electron‐transporting layer, and active layer, the ultraflexible OPVs exhibit a PCE of 10.8%. The combination of new materials with the developed patterning method is expected to afford even greater performances.

中文翻译：

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用于超柔有机光伏的纳米光栅结构超薄基板

聚合物基底表面的纳米图案增强了光伏的性能。超柔性有机光伏（OPV）是可穿戴电子设备中有希望的能量收集器之一。对于其中入射光的角度由于设备的变形而连续变化的可穿戴电子设备，期望在保持功率转换效率（PCE）的同时减小入射光角度的依赖性。然而，使用报道的方法对超柔性OPV的超薄聚合物基材进行纳米图案化具有挑战性，因为它们致命地损害了基材。此处，报道了通过开发超薄纳米光栅聚合物基板来制造具有低入射光角依赖性，同时保持PCE为10.5％的超柔性OPV的方法。纳米光栅图案化的氟化聚合物可在周期为760 nm，高度为100 nm的1 µm厚度的聚合物基板的背面上形成周期性的纳米光栅结构，而在形成平坦化层后，相对的表面仍保持平坦。此外，通过对超薄基板，电子传输层和有源层进行纳米构图，超柔性OPV的PCE为10.8％。新材料与发达的构图方法的结合有望提供更高的性能。通过对超薄基板，电子传输层和有源层进行纳米构图，超柔性OPV的PCE为10.8％。新材料与发达的构图方法的结合有望提供更高的性能。通过对超薄基板，电子传输层和有源层进行纳米构图，超柔性OPV的PCE为10.8％。新材料与发达的构图方法的结合有望提供更高的性能。