Cold wall reactor for ultra-high vacuum high temperature chemical vapor deposition
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Chemical vapor deposition is a process that enables the deposition of thin films material with a high degree of thickness control, composition and film quality. In an ultra-high vacuum environment (UHV), films of high purity and controlled crystal structure can be achieved. The control of the crystal structure is achieved thanks to reduced contamination, e.g. oxygen, which allows the grown film to align itself with the underlying substrate. The film purity is also ensured by the reduced amount of contaminants present in the UHV environment. This master’s thesis discusses the design and construction of a cold wall reactor using a pyrolytic graphite heater encased in a thin layer of pyrolytic boron nitride, and an Oerlikon-Leybold Turbovac 361 turbomolecular pump. This heater is shown to achieve temperatures greater than 1200°C, as well as reach pressures in the 10-10 Torr range. Graphene growth on copper is discussed as well as the ultra-high vacuum annealing of graphene devices on boron nitride substrates. The graphene growth experiments coupled with this system’s annealing capabilities demonstrate the functionality and versatility of this type of chemical vapor deposition system.