有机/无机杂化钙钛矿太阳能电池光照稳定性及其提升方法

Method for improving illumination instability of organic-inorganic halide perovskite solar cells

有机/无机杂化钙钛矿太阳能电池因其电池效率高达20.1%而备受关注.要实现有机/无机杂化钙钛矿太阳能电池的产业化和商业化,电池的稳定性问题必须解决,主要涉及有机/无机杂化钙钛矿太阳能电池在光照、湿度、高温等环境下能否保持长时间的效率稳定.研究结果表明,疏水的空穴传输层可以有效防止水渗透到钙钛矿层中,从而提高暗态下电池的稳定性.

Organohalogen perovskites are attracting considerable attention for use in solar cells. However, the stability of these devices will determine whether they can be made commercially viable. Device encapsulation or the use of a hydrophobic hole-transporting material can prevent the permeation of water into the perovskite layer and enhance the humidity stability of the cells under dark conditions. With regard to the light stability of solar cells,recent studies have yielded contradictory results. This work investigated the degradation mechanism of perovskite solar cells under illumination. Further, a simple method was proposed for improving their illumination stability. Amino acids were inserted between the compact TiO_2 layer and the perovskite layer to effectively prevent the decomposition of the perovskite layer owing to the superoxide anions and hydroxyl radicals generated under illumination from the H_2O and O_2 adsorbed onto the TiO_2 layer.