Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 16, Pages 4490-4498Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b01855
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Funding
- Minerva Foundation
- Alexander von Humboldt Foundation
- U.S. National Science Foundation [DMR-1719353]
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We consider the Br vacancy in CsPbBr3 as a prototype for the impact of structural dynamics on defect energetics in halide perovskites (HaPs). Using first-principles molecular dynamics based on density functional theory, we find that the static picture of defect energetics breaks down; the energy level associated with a Br vacancy is found to be intrinsically dynamic, oscillating by as much as 1 eV on the picosecond time scale at room temperature. These significant energy fluctuations are correlated with the distance between the neighboring Pb atoms across the vacancy and with the electrostatic potential at these Pb atomic sites. We expect this unusually strong coupling of structural dynamics and defect energetics to bear important implications for both experimental and theoretical analyses of defect characteristics in HaPs. It may also hold significant ramifications for carrier transport and defect tolerance in this class of photovoltaic materials.
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