@article{nokey,

title = {Out-of-equilibrium processes in crystallization of organic-inorganic perovskites during spin coating},

author = {S Pratap and F Babbe and N S Barchi and Z Yuan and T Luong and Z Haber and T-B Song and J L Slack and C V Stan and N Tamura and C M Sutter-Fella and P M\"{u}ller-Buschbaum},

url = {https://doi.org/10.1038/s41467-021-25898-5},

doi = {10.1038/s41467-021-25898-5},

issn = {2041-1723},

year  = {2021},

date = {2021-09-24},

journal = {Nature Communications},

volume = {12},

number = {1},

pages = {5624},

abstract = {Complex phenomena are prevalent during the formation of materials, which affect their processing-structure-function relationships. Thin films of methylammonium lead iodide (CH3NH3PbI3, MAPI) are processed by spin coating, antisolvent drop, and annealing of colloidal precursors. The structure and properties of transient and stable phases formed during the process are reported, and the mechanistic insights of the underlying transitions are revealed by combining in situ data from grazing-incidence wide-angle X-ray scattering and photoluminescence spectroscopy. Here, we report the detailed insights on the embryonic stages of organic-inorganic perovskite formation. The physicochemical evolution during the conversion proceeds in four steps: i) An instant nucleation of polydisperse MAPI nanocrystals on antisolvent drop, ii) the instantaneous partial conversion of metastable nanocrystals into orthorhombic solvent-complex by cluster coalescence, iii) the thermal decomposition (dissolution) of the stable solvent-complex into plumboiodide fragments upon evaporation of solvent from the complex and iv) the formation (recrystallization) of cubic MAPI crystals in thin film.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Real-time observation of nucleation and growth of Au on CdSe quantum dot templates},

author = {N Paul and J Huang and C Liu and T Lin and C Ouyang and Z Liu and C Chen and Z Chen and Z Weng and M Schwartzkopf and S V Roth and P M\"{u}ller-Buschbaum and A Paul},

url = {https://doi.org/10.1038/s41598-021-97485-z},

doi = {10.1038/s41598-021-97485-z},

issn = {2045-2322},

year  = {2021},

date = {2021-09-21},

journal = {Scientific Reports},

volume = {11},

number = {1},

pages = {18777},

abstract = {Semiconductor quantum dot (QD) arrays can be useful for optical devices such as lasers, solar cells and light-emitting diodes. As the size distribution influences the band-gap, it is worthwhile to investigate QDs prepared using different solvents because each of them could influence the overall morphology differently, depending on the ligand network around individual QDs. Here, we follow the nucleation and growth of gold (Au) on CdSe QD arrays to investigate the influence of surface ligands and thereby realized interparticle distance between QDs on Au growth behaviour. We particularly emphasize on the monolayer stage as the Au decoration on individual QDs is expected at this stage. Therefore, we sputter-deposit Au on each QD array to investigate the morphological evolution in real-time using time-resolved grazing-incidence small-angle X-ray scattering (GISAXS). The growth kinetics - independent of the template - signifies that the observed template-mediated nucleation is limited only to the very first few monolayers. Delicate changes in the Au growth morphology are seen in the immediate steps following the initial replicated decoration of the QD arrays. This is followed by a subsequent clustering and finally a complete Au coverage of the QD arrays.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{nokey,

title = {Acoustic Coupling between Plasmonic Nanoantennas: Detection and Directionality of Surface Acoustic Waves},

author = {M Poblet and R Bert\'{e} and H D Boggiano and Y Li and E Cort\'{e}s and G Grinblat and S A Maier and A V Bragas},

url = {https://doi.org/10.1021/acsphotonics.1c00741},

doi = {10.1021/acsphotonics.1c00741},

year  = {2021},

date = {2021-09-17},

journal = {ACS Photonics},

abstract = {Hypersound waves can be efficient mediators between optical signals at the nanoscale. Having phase velocities several orders of magnitude lower than the speed of light, they propagate with much shorter wavelengths and can be controlled, directed, and even focused in a very small region of space. This work shows how two optical nanoantennas can be coupled through an acoustic wave that propagates with a certain directionality. An “emitter” antenna is first optically excited to generate acoustic coherent phonons that launch surface acoustic waves through the underlying substrate. These waves travel until they are mechanically detected by a “receiver” nanoantenna whose oscillation produces a detectable optical signal. Generation and detection are studied in detail, and new designs are proposed to improve the directionality of the hypersonic surface acoustic wave.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}