TY  - JOUR
AU  - Hiller, Jonas L.
AU  - Thalwitzer, Robert
AU  - Bozkurt, Ata
AU  - Ferreira, Matheus Gomes
AU  - Hodak, Richard
AU  - Strauß, Fabian
AU  - Nadler, Elke
AU  - Hinsley, Gerard
AU  - Wang, Bihan
AU  - Ngoi, Kuan Hoon
AU  - Rudzinski, Witold
AU  - Kneschaurek, Ekaterina
AU  - Roseker, Wojciech
AU  - Sprung, Michael
AU  - Lapkin, Dmitrii
AU  - Baranov, Dmitry
AU  - Schreiber, Frank
AU  - Vartanyants, Ivan A.
AU  - Scheele, Marcus
AU  - Zaluzhnyy, Ivan A.
TI  - Mechanically Robust Supercrystals from Antisolvent-Induced Assembly of Perovskite Nanocrystals
JO  - ACS nano
VL  - 19
IS  - 28
SN  - 1936-0851
CY  - Washington, DC
PB  - Soc.
M1  - PUBDB-2025-02354
SP  - 26117
PY  - 2025
AB  - Ordered arrays of nanocrystals, called supercrystals, have attracted significant attention owing to the collective quantum effects arising from the coupling between neighboring nanocrystals. In particular, lead halide perovskite nanocrystals are widely used because of the combination of the optical properties and faceted cubic shape, which enables the formation of highly ordered supercrystals. The most frequently used method for the fabrication of perovskite supercrystals is based on the self-assembly of nanocrystals from solution via slow evaporation of the solvent. However, the supercrystals produced with this technique grow in random positions on the substrate. Moreover, they are mechanically soft due to the presence of organic ligands around the individual nanocrystals. Therefore, such supercrystals cannot be easily manipulated with microgrippers, which hinders their use in applications. In this work, we synthesize mechanically robust supercrystals built from cubic lead halide perovskite nanocrystals by a two-layer phase diffusion self-assembly with acetonitrile as the antisolvent. This method yields highly faceted thick supercrystals, which are robust enough to be picked up and relocated by microgrippers. We employed X-ray nanodiffraction together with high-resolution scanning electron microscopy and atomic force microscopy to reveal the structure of CsPbBr3, CsPbBr2Cl, and CsPbCl3 supercrystals assembled using the two-layer phase diffusion technique and explain their unusual mechanical robustness. Our findings are crucial for further experiments and applications in which supercrystals need to be placed in a precise location, for example, between the electrodes in an electro-optical modulator.
LB  - PUB:(DE-HGF)16
C6  - pmid:40634268
DO  - DOI:10.1021/acsnano.5c07289
UR  - https://bib-pubdb1.desy.de/record/633158
ER  -