Scientific Achievement
The mobility of the native ion species is directly manipulated by seeding chlorine ions (Cl-) or [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)into grain boundaries of hybrid organic-inorganic perovskites (HOIPs).
Significance and Impact
Tuning the mobility of ions in HOIPs grain boundaries controls these materials’ electronic properties, and may render them useful for memristor applications.
Research Details
– Ab-initio molecular dynamics simulations derive a fundamental mechanism for Cl- segregation into grain boundaries (GBs).
– Electron microscopy and a novel band-excitation Kelvin probe force microscopy (BE-KPFM) measure the ion migration, showing significant enhancement or suppression by introducing mobile Cl− ions or PCBM, respectively, into GBs.
B. Yang, C. C. Brown, J. Huang, L. Collins, X. Sang, R. R. Unocic, S. Jesse, S. V. Kalinin, A. Belianinov, J. Jakowski, D. B. Geohegan, B. G. Sumpter, K. Xiao, and O. S. Ovchinnikova, “Enhancing Ion Migration in Grain Boundaries of Hybrid Organic–Inorganic Perovskites by Chlorine,” Adv. Funct. Mater. 27, 1700749 (2017). DOI: 10.1002/adfm.201700749
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