Title page for etd-0604118-221206


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URN etd-0604118-221206
Author Wan-Ting Yen
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Phase diagram of Bi-Cu-Te and Thermoelectric properties of Cu doped Bi2Te3 alloys
Date of Defense 2018-06-20
Page Count 255
Keyword
  • Thermoelectric material, Bi2Te3, Bi-Cu-Te, isothermal section, liquidus projection
  • Abstract Thermoelectric material (TE) could convert waste heat directly into electricity, and therefore it could pave the way toward the environmental sustainability. The layered-structure Bi2Te3, which crystallize in a rhombohedral symmetry, show anisotropic transport properties, and are the most well-established room-temperature TE materials. Herein we aim to tune the thermal/electrical transport properties of the Bi2Te3-based alloys, by incorporating minor amount of Cu, to form a series of Cu-doped Bi2Te3 alloys. The homogeneity regime, phase stability and microstructural evolution are elaborated by establishing the 523K isothermal section and liquidus projection of ternary Bi-Te-Cu system, using the thermally-equilibrated or solidified alloys. In addition, the TE properties of selective Cu-doped Bi2Te3 alloys that grown by the Bridgman method suggest that the small deviations in the starting compositions could lead to the huge the difference in the resultant TE performance. At 300 K, the highest peak zT for p-type ((Bi2Te3)0.99(Cu2Te)0.01) and n-type (Bi2¬¨Cu0.01Te2.99) Cu-containing Bi2Te3 are zT~1.2 and zT~1.7, respectively.
    Advisory Committee
  • Sinn-Wen Chen - chair
  • Liu-Wen Chang - co-chair
  • Pai-Chun Wei - co-chair
  • Hsin-Jay Wu - advisor
  • Files
  • etd-0604118-221206.pdf
  • Indicate in-campus at 3 year and off-campus access at 3 year.
    Date of Submission 2018-07-04

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