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Optimization of parameters for the ultrasonic spray coating of nanocrystal thin films

Chemical Engineering, Robert (2023) Optimization of parameters for the ultrasonic spray coating of nanocrystal thin films. Master's Thesis / Essay, Chemical Engineering.

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Nanocrystal of various semiconductors show promising properties for use in optoelectronic devices due to their unique advantages over bulk semiconductors. For use in devices these nanocrystals must be deposited from solution into a solid thin film. Currently, many of the best performing devices found in literature are deposited via spin coating and are extremely small scale. Due to large material wastage, poor scalability and incompatibility with roll-to-roll processing spin coating cannot be used for industrial production. To overcome this spray coating represents a promising fabrication technique for upscaling. Spray coating is a complex process with many tuneable parameters; therefore, it is important to understand how each parameter effects the film quality. First a custom spray coating setup was made for a lower cost than most commercial setups. Then CsPbBr3 nanocrystals were sprayed in various solvents and a wide variety of spray coating parameters are varied, the resulting films are analysed by optical microscopy, profilometry, absorbance, photoluminescence and photoluminescence quantum yield. From these experiments good deposition uniformity was achieved with wetter films however better optical properties were achieved with dry deposition. These experiments serve as a guide for future optimisation towards smooth films with good optical properties.

Item Type: Thesis (Master's Thesis / Essay)
Supervisor name: Protesescu, L. and Pescarmona, P.P.
Degree programme: Chemical Engineering
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 10 May 2023 07:49
Last Modified: 10 May 2023 07:49

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