Open AccessFluorescent Alloy CsPbxMn1–xI3 Perovskite Nanocrystals with High Structural and Optical Stability
Author(s) -
Quinten A. Akkerman,
Daniele Meggiolaro,
Zhiya Dang,
Filippo De Angelis,
Liberato Manna
Publication year - 2017
Publication title -
acs energy letters
Language(s) - English
Resource type - Journals
ISSN - 2380-8195
DOI - 10.1021/acsenergylett.7b00707
Subject(s) - nanocrystal , alloy , perovskite (structure) , materials science , crystal structure , phase (matter) , lattice (music) , conduction band , condensed matter physics , nanotechnology , crystallography , chemical physics , chemistry , electron , physics , metallurgy , organic chemistry , acoustics , quantum mechanics
CsPbI 3 nanocrystals are still limited in their use because of their phase instability as they degrade into the yellow nonemitting δ-CsPbI 3 phase within a few days. We show that alloyed CsPb x Mn 1- x I 3 nanocrystals have essentially the same optical features and crystal structure as the parent α-CsPbI 3 system, but they are stable in films and in solution for periods over a month. The stabilization stems from a small decrease in the lattice parameters slightly increasing the Goldsmith tolerance factor, combined with an increase in the cohesive energy. Finally, hybrid density functional calculations confirm that the Mn 2+ levels fall within the conduction band, thus not strongly altering the optical properties.