研究利用静电纺丝制备的不同直径ZnO纳米纤维作为倒置结构有机太阳能电池的电子传输层对器件转化效率的影响。 首先通过静电纺丝技术成功制备了半径在43～110 nm之间的ZnO纳米纤维, 然后将ZnO纳米纤维作为电子传输层加入到倒置结构有机太阳能电池(ITO/ZnO∶ZnO nanofiber/PTB7∶PC70BM/MoO3/Al)。 与平面结构的ZnO电子传输层相比, ZnO纳米纤维具有比表面积大等优点, 增加了电子传输和抽取能力, 提高了器件的光电转化效率。 实验发现ZnO纳米纤维的直径越小, 电池效率越大。 当ZnO纳米纤维直径为(46±5)nm, 接收时间为30 s时, 作为电子传输层的电池效率提高了8%。

In this paper, the effects of different diameters of ZnO nanofibers prepared by electrospinning on the conversion efficiency of organic solar cells were studied. First of all, ZnO nanofibers with diameters ranging from 43 to 110 nm were prepared by electrospinning technique. Then, ZnO nanofibers with different diameters were added to inverted organic solar cells (ITO/ZnO∶ZnO nanofiber/PTB7∶PC70BM/MoO3/Al) as electron transport layer. Compared to the planar ZnO electron transport layer, ZnO nanofibers have the advantages of large specific surface area, increasing the ability of electron transfer and extraction and improving the photoelectric conversion efficiency of the device. It was found that the smaller the diameter of ZnO nanofibers is, the greater the efficiency of the cells will be. When the diameter of ZnO nanofibers was (46±5) nm and the receiving time was 30 s, conversion efficiency of the cell increased by 8%.