论文标题
稳定性优化的钙钛矿纳米晶体中的能量转移
Energy Transfer in Stability-Optimized Perovskite Nanocrystals
论文作者
论文摘要
出色的光电特性和简便的合成使卤化物钙钛矿纳米晶体（NCS）是基于纳米结构的设备的有前途的材料。但是，商业化主要是由于在环境条件下缺乏NC稳定性和电荷载体注入效率低下而阻碍了商业化。在这里，我们使用二嵌段的共聚物核心核壳胶束，使用溴化二酰基二酰基二酰胺（MAPBBR_3）NCS进行调查。我们确认壳不会禁止能量转移，因为这些NCS和2D CSPBBR_3纳米片（NPLS）的效率达到73.6％。该值与胶束尺寸密切相关，较厚的壳显示出明显降低的货物效率。这些高效率是有代价的，因为最薄的壳保护封装的NCS较少免受环境诱发的降解。找到效率和保护之间的最佳位置可能会导致实现量身定制的能量漏斗，并具有增强的载体密度，用于基于高功率的钙钛矿NC基于光电的应用。
Outstanding optoelectronic properties and a facile synthesis render halide perovskite nanocrystals (NCs) a promising material for nanostructure-based devices. However, the commercialization is hindered mainly by the lack of NC stability under ambient conditions and inefficient charge carrier injection. Here, we investigate solutions to both problems, employing methylammonium lead bromide (MAPbBr_3) NCs encapsulated in diblock copolymer core-shell micelles of tunable size. We confirm that the shell does not prohibit energy transfer, as FRET efficiencies between these NCs and 2D CsPbBr_3 nanoplatelets (NPLs) reach 73.6%. This value strongly correlates to the micelle size, with thicker shells displaying significantly reduced FRET efficiencies. Those high efficiencies come with a price, as the thinnest shells protect the encapsulated NCs less from environmentally induced degradation. Finding the sweet spot between efficiency and protection could lead to the realization of tailored energy funnels with enhanced carrier densities for high-power perovskite NC-based optoelectronic applications.
