"Dislocation-Driven Growth of Nanomaterials and Metal Halide Perovskite Nanostructures for Optoelectronics"
Understanding and controlling the nanoscale morphology of inorganic materials present both challenges and opportunities for exploring new properties and applications. I will first describe a general growth mechanism of anisotropic nanomaterials, in which screw dislocation defects provide the self-perpetuating steps to enable anisotropic crystal growth in one-dimensional (1D) nanowires and nanotubes, two-dimensional (2D) plates, and complex multi-dimensional morphologies, such as nanotrees and nanoflowers. Such understanding has enabled the rational solution synthesis of a variety of nanomaterials with controllable morphologies for large scale renewable energy applications. We have further used such insights to develop the growth of single-crystal nanowires and nanoplates of lead halide perovskite semiconductor materials via a dissolution-recrystallization pathway. The same attributes that enable these perovskites in highly efficient solar cells also make such nanostructures of diverse perovskite materials of various dimensionalities promising for high performance tunable lasers, light-emitting diodes, and other optoelectronic applications, as well as fundamental studies.