Studies of mist deposition for the formation of quantum dot CdSe films

Abstract

Films of CdSe(ZnS) colloidal nanocrystalline quantum dots (NQDs) were deposited on bare silicon, glass and polymer coated silicon using mist deposition. This effort is a part of an exploratory investigation in which this deposition technique is studied for the first time as a method to form semiconductor NQD films. The process parameters, including deposition time, solution concentration and electric field, were varied to change the thickness of the deposited film. Blanket films and films deposited through a shadow mask were created to investigate the method's ability to pattern films during the deposition process. The differences between these deposition modes in terms of film morphology were observed. Overall, the results show that mist deposition of quantum dots is a viable method for creating thin, patterned quantum dot films using colloidal solution as the precursor. It is concluded that this technique shows very good promise for quantum dot (light emitting diode, LED) fabrication.

Aqueous Solution Processing of F-Doped SnO2 Transparent Conducting Oxide Films Using a Reactive Tin(II) Hydroxide Nitrate Nanoscale Cluster

“…19 New SnO 2 and F:SnO 2 precursors are needed to take advantage of spin processing for advanced thin-film applications. Such new precursors would also be useful for other, related, lowtemperature solution-deposition processes including mist, 26 dip, 27 slot-die, 28 or capillary 29,30 deposition and thus further enable the large-area or roll-to-roll deposition of functional inorganic materials.…”

Quantum Dot Light-Emitting Diode with Quantum Dots Inside the Hole Transporting Layers

“…Besides, these nanocrystals are capped with organic ligands that make them dispersible in aqueous/organic solutions. Therefore, they can be integrated easily into the conventional organic LEDs (OLEDs) with the use of common low-cost techniques such as spin-coating, , dip-coating, layer-by-layer assembly, , inkjet printing, contact printing, and mist deposition . The hybrid combination of organic semiconductors and inorganic nanocrystal colloids potentially allows for new possibilities to control exciton formation, hence achieving high light-emission efficiency.…”

Patterned mist deposition of tri-colour CdSe/ZnS quantum dot films toward RGB LED devices

“…It has been shown that the mist deposition process can create patterns on the substrate surface and that it is possible to pattern separate coloured CdSe/ZnS core/shell QDs (purchased from Ocean Nano Tech) without damaging any previously deposited QD layer [10,11]. The ability to replicate a pattern accu− rately will prove necessary when patterning three separate colours closely together.…”

“…The ability to replicate a pattern accu− rately will prove necessary when patterning three separate colours closely together. Mist deposition can be used to cre− ate patterned depositions of multiple colours in the micron range without damage to other existing layers [10,11]. The mist deposition process has been used for other LED appli− cations already such as blue OLED technology, and proven its ability to create high brightness LEDs [12].…”