氟化物对钙钛矿太阳能电池的钝化研究进展

Research Progress in the Passivation of Perovskite Solar Cells by Fluoride

目前钙钛矿太阳能电池因溶液法工艺制备的多晶薄膜具有大量的缺陷,分布在钙钛矿薄膜内部和钙钛矿薄膜与电荷传输层的界面上,由此导致的非辐射复合极大地降低了钙钛矿太阳能电池器件的光伏性能,同时也成为钙钛矿太阳能电池稳定性问题和迟滞效应的产生的重要原因。研究证明,钝化处理是解决该问题的重要手段,它可以有效地减少钙钛矿薄膜中的陷阱状态,减少钙钛矿太阳能电池工作过程中的非辐射复合,进而减少光电转换过程中的能量损失,因此提升器件的性能。综述了氟化物作为钝化材料对钙钛矿太阳能电池的钝化机理及其优势,氟化物分别在钙钛矿薄膜与电荷传输层界面处以及在薄膜内晶界处的钝化研究进展,进一步提出氟化物作为钝化材料对于提升钙钛矿太阳能电池光伏性能、稳定性的意义及今后展望。

At present,polycrystalline thin films prepared by solution process of perovskite solar cells have a large number of defects,which are distributed inside perovskite thin films and on the interface between perovskite thin films and charge transport layer.The resulting non-radiation composite greatly reduces the photovoltaic performance of perovskite solar cell devices.At the same time,it is also an important reason for the stability problem and hysteresis effect of perovskite solar cells.It is proved that passivation treatment is an important means to solve this problem.It can effectively reduce the trap state in perovskite thin films,reduce the non-radiation recombination in the working process of perovskite solar cells,and thus reduce the energy loss in the photoelectric conversion process,so as to improve the performance of devices.In this paper,the passivation mechanism and advantages of fluoride as passivation material for perovskite solar cells were reviewed.The research progress of fluoride passivation at the interface between perovskite thin film and charge transport layer and at the inner grain boundary of the thin film were reviewed.The significance of fluoride as passivation material for improving the photovoltaic performance and stability of perovskite solar cells and its future prospect were proposed.