LEAPS-MPS: Achieving Single Lead Halide Perovskite Nanocrystal Growth on a Soft Liquid/Liquid Interface

在该项目中，由化学学部管理，由EPSCoR共同资助，俄克拉何马大学董一统教授和他的学生将在单粒子水平上研究卤化铅钙钛矿纳米晶体的生长，以推进低成本单光子发射器（spe）的发展。根据需要发射光子的spe对于构建未来的量子光子网络是必要的，以确保安全的量子通信。该项目将能够对单个钙钛矿纳米晶体进行精确的光谱测量，而不会受到合成后纳米晶体降解的干扰。此外，研究结果将促进对胶体钙钛矿纳米晶体生长机制的理解。该项目将把新的材料合成方法整合到俄勒冈大学的不同研究项目和中心。董教授亦会透过这个计划，创造机会吸引本科生参与，并透过一系列外展计划，鼓励未来的学生参与。董教授和他的学生将创造一个纳米级的液体/液体（L/L）界面，限制在纳米吸管的尖端，用于纳米晶体的生长。晶体前驱体的扩散和传递将通过调整其电化学电位来调节。纳米晶的成核和生长动力学有望通过控制纳米吸管尖端的尺寸和在L/L界面上施加的电化学偏差来调节。他们还将使用共聚焦荧光显微镜来监测纳米晶体生长过程中的光致发光光谱，并使用光子相关测量来评估在L/L界面上产生的纳米晶体的数量。这些努力将实现单卤化铅钙钛矿纳米晶体的生长。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

In this project, managed by the Chemistry Division and jointly funded by the Established Program to Stimulate Competitive Research (EPSCoR), Professor Yitong Dong and his students at the University of Oklahoma (OU) will study lead halide perovskite nanocrystal growth at the single-particle level to advance the development of low-cost single photon emitters (SPEs). SPEs that emit photons on demand are necessary to build future quantum photonic networks that ensure secure quantum communications. This project will enable accurate spectroscopy measurements of individual perovskite nanocrystals without interferences from post-synthesis nanocrystal degradations. Furthermore, the findings will advance the understanding of the growth mechanism of colloidal perovskite nanocrystals. The project will integrate new material synthesis approaches into different research programs and centers at OU. Professor Dong will also create opportunities to engage undergraduate students through the project and encourage the participation of prospective students through a series of outreach programs. Professor Dong and his students will create a nano-sized liquid/liquid (L/L) interface confined to the tip of a nanopipette for nanocrystal growth. The diffusion and delivery of crystal precursors will be regulated by tuning their electrochemical potentials. The nanocrystal nucleation and growth kinetics are expected to be tunable by controlling the dimensions of the nanopipette tip and the electrochemical biases applied across the L/L interface. They will also use a confocal fluorescence microscope to monitor the photoluminescence spectra of nanocrystals during their growth and photon correlation measurements to assess the number of nanocrystals generated on the L/L interface. These efforts will achieve single lead halide perovskite nanocrystal growth.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.