Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 13, Pages 15380-15388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c00561
Keywords
hybrid organic-inorganic perovskites (HOIP); impedance spectroscopy (IS); time-resolved Kelvin probe force microscopy (tr-KPFM); ion transport; macroscale; nanoscale
Funding
- Los Alamos National Laboratory (LANL) Directed Research and Development Funds (LDRD)
- National Nuclear Security Administration of the U.S. Department of Energy [89233218NCA000001]
- U.S. Department of Energy [DE-AC05-00OR22725]
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Progress in flexible organic electronics necessitates a full understanding of how local inhomogeneities impact electronic and ionic conduction pathways and underlie macroscopic device characteristics. We used frequency- and time-resolved macro- and nanoprobe measurements to study spatiotemporal characteristics of multiscale charge transport dynamics in a series of ternary-blended hybrid organic inorganic perovskites (HOIPs) (MA(0.95-x)FA(x)Cs(0.05)PbI(3)). We show that A-site cation composition defines charge transport mechanisms across broad temporal (10(2)-10(-6) s) and spatial (millimeters-picometers) scales. Ab initio molecular dynamic simulations suggest that insertion of FA results in a dynamic lattice, improved ion transport, and dipole screening. We demonstrate that correlations between macro- and nanoscale measurements provide a pathway for accessing distribution of relaxation in nanoscale polarization and charge transport dynamics of ionically conductive functional perovskites.
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