论文标题
通过与六角硼硝化硼封装对二维钙钛矿的长期稳定
Long-Term Stabilization of Two-Dimensional Perovskites by Encapsulation with Hexagonal Boron Nitride
论文作者
论文摘要
众所周知，金属卤化物钙钛矿会迅速降解，从而限制了它们的直接适用性。在这里，使用荧光，吸光度和荧光寿命测量结果研究了在环境条件下的二维钙钛矿的苯乙酰胺铅（PEA2PBI4）的降解。已经证明，通过用六角形硝化硼封装可以实现二维钙钛矿的长期稳定性。虽然未封装的钙钛矿薄片在数小时内降解，但封装的钙钛矿稳定至少三个月。此外，封装大大改善了激光照射下的稳定性。环境稳定性，以及在照明下提高的耐久性结合在一起，是对该材料平台内在的光电极特性进行彻底的光谱研究的关键要素。
Metal halide perovskites are known to suffer from rapid degradation, limiting their direct applicability. Here, the degradation of phenethylammonium lead iodide (PEA2PbI4) two-dimensional perovskites under ambient conditions is studied using fluorescence, absorbance and fluorescence lifetime measurements. It is demonstrated that a long-term stability of two-dimensional perovskites can be achieved through the encapsulation with hexagonal boron nitride. While un-encapsulated perovskite flakes degrade within hours, the encapsulated perovskites are stable for at least three months. In addition, encapsulation considerably improves the stability under laser irradiation. The environmental stability, combined with the improved durability under illumination, is a critical ingredient for thorough spectroscopic studies of the intrinsic opto-electronic properties of this material platform.
