Abstract Organic photovoltaics (OPV) has improved significantly in recent years and power conversion efficiencies are getting close to those of hybrid and inorganic thin film PV technologies. In this work, we demonstrate high performance inverted organic photovoltaic cells from electrospun nanofiber based electron transport layers, which outperform their thin-film counterpart. FTO/ZnOfilm/ZnOnanofibers/PTB7:PC70BM/MoO3/Ag devices were designed with different ZnO nanofiber based electron transporting layers (ETL) varying the nanofiber width and thickness, using a conventional electrospinning technique for the nanofiber ETL fabrication. We demonstrate that 35 nm thick films of electrospun ZnO nanofibers results in an improvement of the short-circuit current density (Jsc) and fill factor (FF) in the cells, leading to power conversion efficiency of up to 7.6%. The improvement is assigned to an improved charge collection efficiency, due to realization of direct and continuous pathway for electron extraction inside the solar cell structure. The results highlight the application of one-dimensional nanofiber based charge extraction layers as a promising route for development of high performance OPV devices in the future.

中文翻译：

---

用于增强有机光伏器件性能的电纺 ZnO 纳米纤维夹层

摘要 近年来，有机光伏 (OPV) 得到了显着改善，其功率转换效率已接近混合和无机薄膜光伏技术。在这项工作中，我们展示了来自基于电纺纳米纤维的电子传输层的高性能倒置有机光伏电池，其性能优于薄膜对应物。FTO/ZnOfilm/ZnOnanofibers/PTB7:PC70BM/MoO3/Ag 器件设计有不同的基于 ZnO 纳米纤维的电子传输层 (ETL)，改变纳米纤维的宽度和厚度，使用传统的静电纺丝技术制造纳米纤维 ETL。我们证明了 35 nm 厚的电纺 ZnO 纳米纤维膜可提高电池中的短路电流密度 (Jsc) 和填充因子 (FF)，导致电源转换效率高达 7.6%。由于在太阳能电池结构内部实现了直接和连续的电子提取途径，因此改进归因于电荷收集效率的提高。结果强调了基于一维纳米纤维的电荷提取层的应用作为未来开发高性能 OPV 设备的有希望的途径。