Transient Lattice Dynamics of Metal Halide Perovskites

Solution-processed metal halide perovskite compositions offer scalable synthesis as well as highly desirable optoelectronic properties. As such, these materials offer significant prospects for use in light absorption and emission technologies including solar cells, light emitting diodes, and lasers. We report studies of transient X-ray diffraction paired with temperature dependent diffraction and optical studies that probe the response of the lattice in these materials to optical excitation. Materials studied span 0D, 2D, and 3D dimensionality. In some cases, surprising evolution of lattice symmetry is observed as well as phase metastability. The findings offer insight regarding optical response of these materials and present opportunities.