Owing to the ecological destruction and the energy crisis, harvesting green energy from the environment has become a hot issue in modern times. Here, a facile, flexible and stable hybrid unit nanogenerator (NG) with ultraviolet (UV) protection based on poly(vinylidene fluoride) (PVDF) piezoelectric nanogenerator (PENG) unit and ultraviolet photovoltaic (SC) unit is fabricated. Specially, self-made thiophenyl soluble conjugated polymer (scp)/zinc oxide (ZnO) quantum dots nanocomposite film was prepared by spin-coating in ambient air condition as UV photoelectric and UV-protective thin film. The flexible photovoltaic films were found to exhibit good photovoltaic performance with a dominating fraction of UV absorption. Under external mechanical forces and UV LED illumination, and the open-circuit output voltage and short-circuit current of the device were significantly enhanced by UV LED constant light exposure. To specify this device performance, the effects of different external mechanical forces and UV illumination on the output of hybrid unit are also analyzed, the open-circuit output voltage of the device was significantly influenced by UV illumination. To demonstrate the practical applications of flexible hybrid unit NG, it exhibits high performance with a maximum power density of 0.97 mW/cm3. The device is able to charge a 33-μF capacitor to 3.6 V within a short time span (60 s) and drive a red LED for a few seconds. This work explores new prospects for UV-protective energy harvesting which can eventually boost up the self-powered electronic robotics and wearable systems based on renewable energy.

中文翻译：

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用于同时收集紫外光和机械能的防紫外线、灵活和稳定的光伏辅助压电混合单元纳米发电机

由于生态破坏和能源危机，从环境中获取绿色能源已成为近代的热点问题。在这里，基于聚偏二氟乙烯 (PVDF) 压电纳米发电机 (PENG) 单元和紫外线光伏 (SC) 单元，制造了一种简便、灵活且稳定的具有紫外线 (UV) 保护的混合单元纳米发电机 (NG)。特别地，通过在环境空气条件下旋涂制备了自制的噻吩可溶性共轭聚合物（scp）/氧化锌（ZnO）量子点纳米复合薄膜，作为紫外光电和紫外防护薄膜。发现柔性光伏薄膜表现出良好的光伏性能，其中主要部分是紫外线吸收。在外部机械力和 UV LED 照射下，UV LED恒光照射显着提高了器件的开路输出电压和短路电流。为了说明该器件的性能，还分析了不同外部机械力和紫外线照射对混合单元输出的影响，紫外线照射显着影响了器件的开路输出电压。为了演示灵活混合单元 NG 的实际应用，它表现出高性能，最大功率密度为 0.97 mW/cm3。该器件能够在短时间内（60 秒）将 33μF 电容器充电至 3.6V，并驱动红色 LED 几秒钟。这项工作探索了紫外线防护能量收集的新前景，最终可以推动基于可再生能源的自供电电子机器人和可穿戴系统。