How Chemical Bonding Impacts Halide Perovskite Nanocrystals Growth to Bulk Films: Implication of Pb-X Bond on Growth Kinetics.
Chemphyschem
; 24(14): e202300202, 2023 Jul 17.
Article
en En
| MEDLINE
| ID: mdl-37153988
ABSTRACT
Lead halide perovskites nanocrystals have emerged as a leading candidate in perovskite solar cells and light-emitting diodes. Given their favorable, tunable optoelectronic properties through modifying the size of nanocrystals, it is imperative to understand and control the growth of lead halide perovskite nanocrystals. However, during the nanocrystal growth into bulk films, the effect of halide bonding on growth kinetics remains elusive. To understand how a chemical bonding of Pb-X (covalency and ionicity) impact on growth of nanocrystals, we have examined two different halide perovskite nanocrystals of CsPbCl3 (more ionic) and CsPbI3 (more covalent) derived from the same parent CsPbBr3 nanocrystals. Tracking the growth of nanocrystals by monitoring the spectral features of bulk peaks (at 445â
nm for Cl and at 650â
nm for I) enables us to determine the growth activation energy to be 92â
kJ/mol (for CsPbCl3 ) versus 71â
kJ/mol (for CsPbI3 ). The electronegativity of halides in Pb-X bonds governs the bond strength (150-240â
kJ/mol), characteristics of bonding (ionic versus covalent), and growth kinetics and resulting activation energies. A fundamental understanding of Pb-X bonding provides a significant insight into controlling the size of the perovskite nanocrystals with more desired optoelectronic properties.
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Bases de datos:
MEDLINE
Idioma:
En
Revista:
Chemphyschem
Asunto de la revista:
BIOFISICA
/
QUIMICA
Año:
2023
Tipo del documento:
Article
País de afiliación:
Corea del Sur