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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10363417" target="_blank" >RIV/00216208:11320/17:10363417 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1021/acsnano.6b04721" target="_blank" >http://dx.doi.org/10.1021/acsnano.6b04721</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsnano.6b04721" target="_blank" >10.1021/acsnano.6b04721</a>

Result language

angličtina

Original language name

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

Original language description

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 &gt; 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ACS Nano

ISSN

1936-0851

e-ISSN

—

Volume of the periodical

11

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

1246-1256

UT code for WoS article

000395357300015

EID of the result in the Scopus database

2-s2.0-85014152697