Uniform Assembly-Coating of Perovskite Quantum Dots via Marangoni and Capillary Flow Direction Control
발표자
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초록
내용
In solid substrate, the colloidal solution produces an irregular deposit by the main flow during evaporation. Perovskite quantum dots (PQDs) belonging to colloidal solutions are promising materials for various applications, but this leads to irregular surfaces in the QD system due to solvent evaporation. In general, particles are accumulated on the tri-contact line due to Marangoni and capillary flow, resulting in a problem of not high reproducibility. We tried "assembly-coating" by controlling the angle of the substrate to change the direction of the two flows. As a result, the evaporation time of the droplets was extended due to the extension of the Marangoni flow, which led to uniform deposition of the particles. This was theoretically proven by calculating the Marangoni and capillary number. This strategy indicate that it is effective for the design of the light emitting layer because it increases the hole mobility in the QD-diode.