Rezaei Shad, Kimia2023-09-262023-09-26http://hdl.handle.net/10393/45473http://dx.doi.org/10.20381/ruor-29679There has been considerable focus on quantum dots (QDs) and nanoparticles (NPs) and their extensive applications. Binary and Ternary QDs such as PbS and CuInS2 (CIS) QDs, owing to their superior chemical, physical, electrical, and optical properties, are utilized in a wide variety of optoelectronic and photonic applications such as solar cells, LEDs, and photodetectors. This research describes an inexpensive approach for fabricating self-assembled binary and ternary quantum dots (QDs), including PbS and CIS, using a reactive blade coating technique based on the in-situ fabrication of QDs from their precursor solutions. Roll-to-roll compatibility makes this technique ideal for scalable nanomanufacturing. For PbS QDs, Pb ink, containing the Pb precursor, was first produced by dissolving lead acetate in Oleic acid and Octadecene, and S ink, containing S precursor, was made by dissolving the sulfur powder in oleylamine (OLA). Fabrication of thin films was conducted by first blade coating the Pb ink and then coating the S ink on top of it. Three different heating methods (vacuum oven, hotplate in the glovebox, and rapid thermal annealing (RTA) were used for heating the blade-coated samples. Different temperatures and heating durations were investigated in each heating method to find the best parameter. Crystallographic structure and the morphology of the synthesized QDs were characterized with X-ray diffractometer (XRD), Energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM). Moreover, UV-vis absorption and photoluminescence (PL) emission tests were executed on the samples to understand the optoelectronic behavior of the QDs. The obtained result confirmed the formation of different shapes of PbS QDs showing PL emission peaks in the UV-vis range that can be used in optoelectrical applications. Furthermore, the facile blade coating technique mentioned above was also used for synthesizing CIS QDs, which are more environmentally friendly particles compared to PbS QDs. In the CIS blade coating process, first CuIn ink was prepared by dissolving copper iodide and indium acetate in OLA, and S ink was prepared by dissolving S powder in OLA. The in-situ fabrication of CIS QDs was performed by first blade-coating one layer of CuIn ink, followed by blade-coating one layer of S ink on top of that. The blade-coated samples were heated with the RTA method, which was selected as the best heating method for preparing PbS QDs (details mentioned in Chapter 3). Different heating temperatures and durations were tried to heat the blade-coated samples with RTA. XRD, SEM, EDS, and transmission electron microscope (TEM) tests were investigated on CIS QDs to understand their crystal structure and morphology. Moreover, UV-test and photoluminescence tests were also executed on the samples to check their optoelectronic properties. Another step towards industrialization of the in-situ reactive blade coating system was achieved using different techniques to get a full-coverage uniform thin film. Using UV-ozone cleaning, oxygen plasma cleaning, and silanization process, we were able to get full-coverage uniform CIS thin films (1 × 1 inch). This investigated technique is useful for comprehending the steps required to produce uniform, high-quality thin films using a roll-to-roll compatible, simple method on a large scale.enPbS and CuInS2 Quantum dotsIn-situ reactive synthesisroll-to-roll manufacturing techniqueself-assemblyThesis