Until now, conventional nanogenerators could only produce electric pulses with relatively low-power densities. Herein, we invent a novel controllable growth technique for two-dimensional (2-D) cuprous oxide (p-Cu₂O) single-crystal films, and on this basis, a new concept of 2-D single-crystal film flexoelectric nanogenerators (FENGs) are rationally designed and constructed for the first time, which has the characteristics of long-range order lattice, few grain boundaries and defects. More importantly, the accumulated built-in polarization potential in the bent 2-D p-Cu₂O single-crystal film FENGs is in the same orientation as the output electricity, resulting in the first nanogenerator that can output continuous and stable electric signals with high voltage (V_oc of 2.8 V), current (J_sc of 11.5 μA·cm⁻²) and power density (14.4 μW·cm⁻²), exhibiting great practical application potential for power generation and motion capture. This research breaks new ground and establishes a precedent for high-performance and continuous-output nanogenerators, as well as smart wearable sensors.

到目前为止，传统的纳米发电机只能产生功率密度相对较低的电脉冲。在此，我们发明了一种新颖的二维（2-D）氧化亚铜（p-Cu ₂ O）单晶薄膜可控生长技术，并在此基础上提出了二维单晶薄膜柔性电纳米发电机的新概念。 （FENGs）首次经过合理设计和构造，具有长程有序晶格、晶界少、缺陷少等特点。更重要的是，弯曲的二维 p-Cu ₂ O 单晶薄膜 FENGs 中累积的内建极化电位与输出电的方向相同，从而产生了第一个可以输出连续稳定电信号的纳米发电机高电压（V _oc2.8 V)、电流(J _sc为11.5 μA·cm ^-2 )和功率密度(14.4 μW·cm ^-2 )，在发电和动作捕捉方面表现出巨大的实际应用潜力。这项研究开辟了新天地，开创了高性能和连续输出纳米发电机以及智能可穿戴传感器的先河。