Colloidal PbS quantum dot stacking kinetics during deposition via printing

Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy
Wei ChenPeter Müller-Buschbaum

Abstract

Colloidal PbS quantum dots (QDs) are attractive for solution-processed thin-film optoelectronic applications. In particular, directly achieving QD thin-films by printing is a very promising method for low-cost and large-scale fabrication. The kinetics of QD particles during the deposition process play an important role in the QD film quality and their respective optoelectronic performance. In this work, the particle self-organization behavior of small-sized QDs with an average diameter of 2.88 ± 0.36 nm is investigated for the first time in situ during printing by grazing-incidence small-angle X-ray scattering (GISAXS). The time-dependent changes in peak intensities suggest that the structure formation and phase transition of QD films happen within 30 seconds. The stacking of QDs is initialized by a templating effect, and a face-centered cubic (FCC) film forms in which a superlattice distortion is also found. A body-centered cubic nested FCC stacking is the final QD assembly layout. The small size of the inorganic QDs and the ligand collapse during the solvent evaporation can well explain this stacking behavior. These results provide important fundamental understanding of structure formation of small-sized QD based films prepar...Continue Reading

References

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Aug 1, 2018·Chemical Reviews·Sandeep Ghosh, Liberato Manna
Apr 10, 2019·The Journal of Physical Chemistry Letters·Wei ChenPeter Müller-Buschbaum
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Oct 24, 2019·ACS Applied Materials & Interfaces·Kerstin S WienholdPeter Müller-Buschbaum
Feb 13, 2020·Journal of Applied Crystallography·Gennady PospelovJoachim Wuttke

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Citations

Dec 9, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Matthias SchwartzkopfStephan V Roth
Jun 18, 2021·ACS Nano·Amrita DeyLakshminarayana Polavarapu
Sep 18, 2020·ACS Applied Materials & Interfaces·Wei ChenPeter Muller-Buschbaum

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