Design of thermal-electric devices

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Dr. Mizsei János
Department of Electron Devices

The topic of my thesis was the design of thermal-electric devices, more specifically logic gates,

using vanadium-dioxid, and a structure for measuring the thermal transmisson line. In order to

accomplish that, I had to start with summarizing the existing knowledge about the concepts

of such devices, properties of the vanadium-dioxid, and the effects of phase transition have on

the material, relevant to this reaserh, which occurs due to the change in temperature at 70 C.

After that, I woked out the equations describing the effects of electrical current from a voltage

source have on the VO2 thin film, studied the interaction between a heated and a not heated

slab placed close to each other, and based on these I defined the conditions that must met in

order to get a working logic network, or at least device, which can also be used to design those.

After these, and discussing the effects of the change in the surrounding condicions, I made some

calculations using realistic values, which led me to the conclusion, that using only VO2, creating

working logic gates is difficult and not efficient, but by changing the heating slab from VO2 to

convencional resistor, it can be a device of high value. At the last part of this thesis I worked out

two structure for the purpose of the measurement of a logic circuit and the thermal transmssion

way, considering the technological boundaries at the BUTE Department of Electrionic Devices.

Finally, I summarized the problems I encountered with during my work, which I partially solved,

but need further elaboration, and suggested ways for continued reaserch.


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