Solution Based Synthesis of Cs 4 PbBr 6 Perovskite Particles with High Luminescence and Stability
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.308
Solution Based Synthesis of Cs4PbBr6 Perovskite Particles with High Luminescence and Stability Brian Billstrand1, Kaifu Bian1, Casey Karler1, Dongmei Ye1, Austin Hwang1, Hongyou Fan1,2,*
1
Sandia National Laboratories, Advanced Materials Laboratory, Albuquerque, New Mexico, 87106, United States;
2
The University of New Mexico Center for Micro-Engineered Materials, Department of Chemical and Biological Engineering, Albuquerque, New Mexico 8713, United States
ABSTRACT
Low dimensional lead halide perovskite particles are of tremendous interest due to their sizetunable band gaps, low exciton binding energy, high absorption coefficients, outstanding quantum and photovoltaic efficiencies. Herein we report a new solution-based synthesis of stabilized Cs4PbBr6 perovskite particles with high luminescence. This method requires only mild conditions and produces colloidal particles that are ideal for highly efficient solutionbased device fabrications. The synthesized microstructures not only display outstanding luminescence quantum yield but also long term stability in atmospheric conditions. Partial halide substitutions were also demonstrated to extend photoluminescence spectra of the perovskite particles. This convenient synthesis and optical tunability of Cs4PbBr6 perovskite particles will be advantageous for future applications of optoelectronic advices.
INTRODUCTION Low dimensional organic and inorganic lead halide perovskite particles are of tremendous interest due to their size-tunable band gaps, low exciton binding energy, high absorption coefficients,[1] outstanding luminescence and photovoltaic efficiencies.[2] To overcome the atmospheric vulnerability of traditional methylammonium based devices, recent research trend has focused on materials utilizing cesium cation in combination with a wide variety of long chain ammonium ligands to improve environmental stability and tune the dimension and band gap of perovskite structures.[3-7] Perovskite produced by these methods generally have ABX3, AB2X5, and A4BX6 structures in layers separated by alkylammonium ligands that interact via van der Waals forces. Here A represents an alkaline metal cation such as Cs+, B represents a cation such as Pb 2+ or Sn2+, and X represents a halide ion such as I-, Br-, or Cl-. These structures displayed high photoluminescence quantum yields (PLQY) of 20 - 90%.[8-10]
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As a major challenge, most perovskite materials suffer from very limited atmospheric stability. It has previously been addressed through the efforts including contact passivation and polymeric coatings.[4, 11, 12] This work has focused on synthesizing uniform perovskite particles with a variety of hydrophobic tetraalkylammonium ligands to improve stability of
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