Simulation of core-shell nanowires for thermoelectric applications
Başlık çevirisi mevcut değil.
- Tez No: 789050
- Danışmanlar: PROF. DR. ALESSİO GAGLİARDİ, DR. WALDEMAR KAİSER
- Tez Türü: Yüksek Lisans
- Konular: Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrol, Elektrik ve Elektronik Mühendisliği, Computer Engineering and Computer Science and Control, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Technische Universität München
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 93
Özet
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Özet (Çeviri)
Technological developments lead to the manufacture of brand new devices and systems each year. The increasing number of devices and systems results in energy wastage. Inside most of these devices and systems, the waste energy emerges as certain amounts of heat. Therefore, the conversion of heat into electricity is a possible way to reduce energy wastage. This approach is called thermoelectricity. Thermoelectric conversion is characterized by the thermoelectric figure of merit ZT = S 2σT/κ where S is the Seebeck coefficient, σ is the electrical conductivity, T is temperature and κ is the total thermal conductivity. ZT > 1 is considered to be important for a structure to be used as a traditional thermoelectric device. For this reason, thermoelectric researches and studies are extensively conducted on enhancing the value of ZT. Experimental or numerical analyses are performed to enhance the ZT. Nanowires have a strong potential to maximize the power factor S 2σ and to minimize κ. On the other hand, ZT > 1 is rarely observed for nanowires. This master's thesis focuses on the modeling and simulation-driven investigation of core-shell nanowire design modeled in a technology computer-aided design environment. The utilized design is extracted from experimental work by Prof. Koblmüller from TUM. Three main simulations to comprehend the quantum confinement, charge carrier transport and thermoelectric behaviors are performed. Quantum calculations are important to characterize and provide corrections to the one-dimensional density of states situated in nanowires. Output and transfer characteristics of the nanowire FET design indicate performance parameters of VT=-1.5 V, DIBL=7.22 mV/V and S=26.438 mV/dec. DIBL and VT are close to the experimental results while S is improved in our work. According to thermoelectric simulation results, the improved core-shell nanowire, including the quantum EFA module indicates a value of ZT = 0.0141 which is comparable to other ZT values obtained from nanowires reported in the literature. This value is possible to be enhanced further to achieve a ZT value close to 1.
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