title: Shape evolution and single particle luminescence of organometal halide perovskite nanocrystals.
abstract: Organometallic halide perovskites CH3NH3PbX3 (X = I, Br, Cl) have quickly become one of the most promising semiconductors for solar cells, with photovoltaics made of these materials reaching power conversion efficiencies of near 20%. Improving our ability to harness the full potential of organometal halide perovskites will require more controllable syntheses that permit a detailed understanding of their fundamental chemistry and photophysics. In this manuscript, we systematically synthesize CH3NH3PbX3 (X = I, Br) nanocrystals with different morphologies (dots, rods, plates or sheets) by using different solvents and capping ligands. CH3NH3PbX3 nanowires and nanorods capped with octylammonium halides show relatively higher photoluminescence (PL) quantum yields and long PL lifetimes. CH3NH3PbI3 nanowires monitored at the single particle level show shape-correlated PL emission across whole particles, with little photobleaching observed and very few off periods. This work highlights the potential of low-dimensional organometal halide perovskite semiconductors in constructing new porous and nanostructured solar cell architectures, as well as in applying these materials to other fields such as light-emitting devices and single particle imaging and tracking.
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.
authors: Feng
authors: F
authors: Zhu
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.|‡U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States.
authors: Long
authors: L
authors: Men
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.
authors: Yijun
authors: Y
authors: Guo
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.
authors: Qiaochu
authors: Q
authors: Zhu
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.|‡U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States.
authors: Ujjal
authors: U
authors: Bhattacharjee
authors: §Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States.
authors: Peter M
authors: PM
authors: Goodwin
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.|‡U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States.
authors: Jacob W
authors: JW
authors: Petrich
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.|‡U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States.
authors: Emily A
authors: EA
authors: Smith
authors: †Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.|‡U.S. DOE Ames Laboratory, Ames, Iowa 50011, United States.
authors: Javier
authors: J
authors: Vela
keywords: morphology control; nanocrystals; organometal halide perovskites; preferred orientation; single particle photoluminescence; size control