Molecular templating of layered halide perovskite nanowires
Wenhao Shao, Jeong Hui Kim, Jeffrey Simon, Zhichen Nian, Sung‐Doo Baek, Yuan Lu, Colton Fruhling, Hanjun Yang, Kang Wang, Jee Yung Park, Libai Huang, Yi Yu, Alexandra Boltasseva, Brett M. Savoie, Vladimir M. Shalaev, Letian Dou
Abstract
Layered metal-halide perovskites, or two-dimensional perovskites, can be synthesized in solution, and their optical and electronic properties can be tuned by changing their composition. We report a molecular templating method that restricted crystal growth along all crystallographic directions except for [110] and promoted one-dimensional growth. Our approach is widely applicable to synthesize a range of high-quality layered perovskite nanowires with large aspect ratios and tunable organic-inorganic chemical compositions. These nanowires form exceptionally well-defined and flexible cavities that exhibited a wide range of unusual optical properties beyond those of conventional perovskite nanowires. We observed anisotropic emission polarization, low-loss waveguiding (below 3 decibels per millimeter), and efficient low-threshold light amplification (below 20 microjoules per square centimeter).