Detail:

Abstract:
　　The remarkable performance of lead halide perovskites in solar cells comes from the long carrier lifetimes and low non-radiative recombination rates, the same physical properties that are ideal for lasers and light-emitting devices (LEDs). I will first discuss 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 other complex multi-dimensional morphologies such as nanotrees and nanoflowers. Such understanding has enabled the rational low-cost synthesis of a variety of nanomaterials, such as metals, complex metal oxides and metal hydroxides, with controllable morphologies via solution synthesis. We have further used such insights to understand the crystal growth of lead halide perovskites and developed the solution growth of single crystal nanowires, nanorods, and nanoplates of methylammonium and and formamidinium lead halide and other perovskites via a dissolution-recrystallization pathway. The excellent photophysical properties of such single-crystal perovskite nanowires make them ideal for high performance and tunable semiconductor lasers and for other optoelectronic applications. The facile solution growth of single-crystal nanostructures of the diverse families of perovskite materials with different cations, anions, and dimensionality with different properties will enable many interesting device applications with high performance.

Biosketch：
　　Song Jin is a Professor of Chemistry at the University of Wisconsin-Madison. He received his B.S. in Chemistry from Peking University in 1997, Ph.D. in 2002 from Cornell University under the direction of Prof. Francis J. DiSalvo and carried out his postdoctoral research under the direction of Prof. Charles M. Lieber at Harvard University. Dr. Jin is interested in the chemistry and physics of nanoscale materials and solid state materials and their applications, especially in renewable energy. Dr. Jin developed innovative synthesis of a variety of nanomaterials including metal silicides, oxides, and chalcogenides, and discovered and developed the screw dislocation-driven growth of nanomaterials in the context of crystal growth theory. Building on the fundamental understanding of novel physical properties, Jin advances the exploitation of (nano)materials for photovoltaic and photoelectrochemical solar energy conversion, thermoelectric energy conversion, energy storage, nanospintronics, and biotechnology. The unifying theme of Jin’s energy research is the focus on earth-abundant materials. Dr. Jin has authored or co-authored 114 publications and 3 patents. He has been recognized with a NSF CAREER Award, a Research Corporation Cottrell Scholar Award and as one of world’s top 35 innovators under the age of 35 (TR35 Award) by the MIT Technology Review Magazine, the ACS ExxonMobil Solid State Chemistry Fellowship, and the Alfred P. Sloan Research Fellowship, Research Corporation SciaLog Award for Solar Energy Conversion, and U. of Wisconsin-Madison Vilas Associate Award and H. I. Romnes Faculty Fellowship. Most recently he received the ACS Inorganic Nanoscience Award.