S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Mechanical Aerospace Engineering (기계항공공학부) Theses (Master's Degree_기계항공공학부)
Room-temperature fabrication of flexible thermoelectric generator using dry-spray deposition system
- Dae-Seob Song
- 공과대학 기계항공공학부
- Issue Date
- 서울대학교 대학원
- nano-particle deposition system; flexible thermoelectric generator; dry-spray deposition; room temperature
- 학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2016. 2. 안성훈.
- We present a flexible thermoelectric (TE) generator with titanium dioxide (TiO2), antimony (Sb), and tellurium (Te) powders fabricated by a nanoparticle deposition system (NPDS). NPDS is a novel low-energy consumption dry-spray method that enables the deposition of inorganic materials on substrates at room temperature and under low vacuum. TiO2 nanopowders were dispersed on a TE powder for improved adhesion between TE films and the substrate. Film morphologies were investigated using field-emission scanning electron microscopy, and the phase structure was analyzed by X-ray diffraction. A TE leg, deposited with 3 wt% TiO2 content, had the largest Seebeck coefficient of approximately 160 µV/K. The prototype TE generator consisted of 16 TE legs linked by silver interconnects over an area of 20 × 60 mm2. The prototype produced a voltage of 48.91 mV and a maximum power output of 0.18 µW from a temperature gradient of 20 K. The values are comparable to that of conventional methods. These results suggest that flexible TE generators can be fabricated by energy efficient methods, although internal and contact resistances must be decreased.