Quasi-epitaxial Metal-Halide Perovskite Ligand Shells on PbS Nanocrystals

Journal article
(Original article)

Publication Details

Author(s): Sytnyk M, Yakunin S, Schoefberger W, Lechner RT, Burian M, Ludescher L, Killilea NA, Yousefi Amin AA, Kriegner D, Stangl J, Groiss H, Heiß W
Journal: Acs Nano
Publication year: 2017
Volume: 11
Journal issue: 2
Pages range: 1246-1256
ISSN: 1936-0851
Language: English


Epitaxial growth techniques enable nearly defect free heterostructures with coherent interfaces, which are of utmost importance for high performance electronic devices. While high-vacuum technology-based growth techniques are state-of-the art, here we pursue a purely solution processed approach to obtain nanocrystals with eptaxially coherent and quasi-lattice matched inorganic ligand shells. Octahedral metal-halide clusters, respectively 0-dimensional perovskites, were employed as ligands to match the coordination geometry of the PbS cubic rock-salt lattice. Different clusters (CH3NH3+)((6-x))[M((x+))Hal(6)]((6-x))-(Mx+ = Pb(II), Bi(III), Mn(II), In(III), Hal = Cl, I) were attached to the nanocrystal surfaces via a scalable phase transfer procedure. The ligand attachment and coherence of the formed PbS/ligand core/shell interface was confirmed by combining the results from transmission electron microscopy, small-angle X-ray scattering, nuclear magnetic resonance spectroscopy and powder X-ray diffraction. The lattice mismatch between ligand shell and nanocrystal core plays a key role in performance. In photoconducting devices the best performance (detectivity of 2 X 10(11) cm Hz (1/2)/W with > 110 kHz bandwidth) was obtained with (CH3NH3)(3)BiI6 ligands, providing the smallest relative lattice mismatch of ca. -1%. PbS nanocrystals with such ligands exhibited in millimeter sized bulk samples in the form of pressed pellets a relatively high carrier mobility for nanocrystal solids of similar to 1.3 cm(2)/(V s), a carrier lifetime of similar to 70 mu s, and a low residual carrier concentration of 2.6 X 10(13) cm(-3). Thus, by selection of ligands with appropriate geometry and bond lengths optimized quasi-epitaxial ligand shells were formed on nanocrystals, which are beneficial for applications in optoelectronics.

FAU Authors / FAU Editors

Heiß, Wolfgang Prof. Dr.
Professur für Werkstoffwissenschaften (lösungsprozessierte Halbleitermaterialien)
Killilea, Niall Andrew
Institute Materials for Electronics and Energy Technology (i-MEET)
Sytnyk, Mykhailo
Institute Materials for Electronics and Energy Technology (i-MEET)
Yousefi Amin, Amir-Abbas
Institute Materials for Electronics and Energy Technology (i-MEET)

Additional Organisation
Technische Fakultät
Institute Materials for Electronics and Energy Technology (i-MEET)

External institutions with authors

Johannes Kepler Universität (JKU) Linz
Montanuniversität Leoben

Research Fields

Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät

How to cite

Sytnyk, M., Yakunin, S., Schoefberger, W., Lechner, R.T., Burian, M., Ludescher, L.,... Heiß, W. (2017). Quasi-epitaxial Metal-Halide Perovskite Ligand Shells on PbS Nanocrystals. Acs Nano, 11(2), 1246-1256. https://dx.doi.org/10.1021/acsnano.6b04721

Sytnyk, Mykhailo, et al. "Quasi-epitaxial Metal-Halide Perovskite Ligand Shells on PbS Nanocrystals." Acs Nano 11.2 (2017): 1246-1256.


Last updated on 2018-25-10 at 12:04