Publication date: 3rd July 2020
The synthesis of monodisperse nanocrystals (NCs) in high yields is a challenge that has only been mastered in few material systems. For lead halide perovskite NCs this problem is particularly challenging, due to the low synthesis temperature, fast reaction kinetics and weak bonding of both the ligands to the NC and within the NCs. The combination of these contributions leads to a finite polydispersity of the crude solution. In fact monodisperse lead halide perovskite NCs have only been reported for colloids after some degree of purification.[1] Zwitterion capped lead halide perovskites are no exception, [2, 3] however, the large synthesis scale, high isolated yields and their robustness against anti-solvent based purification, allows for their size selection into several, stable, monodisperse fractions (up to >100 mg inorganic-core-mass of monodisperse NCs in one fraction), which can be purified of all other solutes and stored for months without deterioration [4]. Such pure, stable, versatile and well defined colloids are needed for the study of intrinsic properties of the NCs such as optical properties and their dependence on NC shape and size. Assemblies of zwitterion capped NCs only form from monodisperse colloidal solutions and exhibit larger domain sizes and higher degree of order compared to superlattices formed from NCs with oleic acid and oleylamine ligands and exhibit super-fluorescence at cryogenic temperatures.
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