论文标题
在成核和生长动力学的各个阶段确定混合钙壶的超快载体动力学
Determining ultrafast carrier dynamics of hybrid perovskites at various stages of nucleation and growth kinetics
论文作者
论文摘要
随着杂交有机无机钙钛矿的增加，从光伏太阳能电池到发光设备，再到纳米级晶体管，建立微观结构在决定载体动力学如何决定设备效率方面的作用至关重要。在这里，我们报告了在成核和生长动力学各个阶段，混合钙壶中电荷载体的超快动力学。溶液处理的制造技术，具有优化的自旋涂层条件以控制中间相的成核密度，在温度梯度退火时转换为混合钙壶。该策略将最终导致大颗粒薄膜的成核和生长步骤解开，从而使我们能够探测电子和载体动态差异。令人惊讶的是，成核的微晶体已经显示了混合钙钛矿的电子特性，并具有类似于大颗粒杂化钙钛矿薄膜的类秒至纳秒动力学。
With hybrid organic-inorganic perovskites increasing its technological reach, from photovoltaics solar cells to light-emitting devices, to nanoscale transistors, it is critical to establish the role of microstructures in dictating how carrier dynamics dictate device efficiency. Here we report on the ultrafast dynamics of charge carriers in hybrid perovskites at various stages of nucleation and growth kinetics. A solution-processed fabrication technique, with spin-coating conditions optimized to control the nucleation density of an intermediate phase, converts to hybrid perovskites upon a temperature gradient annealing. This strategy decouples the nucleation and growth steps that lead eventually to large-grain thin films, allowing us to probe electronic and carrier dynamic differences. We find, surprisingly, that the nucleating microcrystals already display the electronic properties of hybrid perovskites and share similar femtosecond-to-nanosecond dynamics as large-grain hybrid perovskite thin films.
