臺灣博碩士論文加值系統

Bi2Te3化合物為室溫下典型的熱電材料，當添加Bi2Se3化合物於此材料後，即成為n-type的Bi2Te3-xSex三元化合物，本實驗使用布氏(Bridgman)長晶法成長，且分別用x=0.12、0.45、0.6和0.85的配比成長晶體。成長出的材料使用光學顯微鏡和SEM觀察表面狀況，且以EDS做定性分析和用EPMA做定量分析，最後量測出各管的電阻率ρ、Seebeck Coefficient α和Thermal Conductivity λ，且算出Z值(Z=α2/(ρλ))分析其電熱特性的優劣。

The semiconducting alloys of Bi2Te3 with Bi2Se3, which form pseudo-ternary solid solutions, are known as the better materials currently available for thermoelectric applications near room temperature. In this study, the single crystals of n-type Bi2Te3-xSex (x=0.12; 0.45; 0.6; 0.85)were grown by the Bridgman techniqe. Surface analysis of the alloys were observed by optical microscopy and SEM. The compostion is investigated by EDS and EPMA. The electrical resistivity ρ , Seebeck coefficient α and thermal conductivity λ measurements were carried out to evatuate the figure of merit of these materials.

第一章 序論 1
第二章 文獻回顧 7
2.1 ZT值 7
2.2 成長方式 14
2.3 相圖 16
2.4 顯微結構 20
2.5 結晶結構和化學鍵結 23
2.6 電特性 29
第三章 實驗方法與步驟 38
3.1 儀器設備 38
3.1.1 布氏(Bridgman)長晶系統 38
3.1.2 真空設備 39
3.1.3 搖擺爐 39
3.2 晶體成長製程 41
3.2.1 材料製備 41
3.2.2 石英管的處理 41
3.2.3 材料裝填與封管 42
3.2.4 晶體成長 42
3.3電熱特性量測方法與步驟 42
3.3.1 電阻率(Electrical Resistivity) 43
3.3.2 塞貝克係數(Seebeck Coefficient) 44
3.3.3 熱導係數(Thermal Conductivity) 46
第四章 實驗結果與討論 53
4.1 晶體成長 53
4.1.1 成長後的塊材 53
4.1.2 EDS量測 56
4.1.3 EPMA量測 70
4.2電熱性質量測 83
4.2.1 電阻率量測 83
4.2.2 Thermal Conductivity量測 91
4.2.3 Seebeck Coefficient量測 97
4.2.4 Figure of Merit(Z值)的計算結果 98
4.3 綜合結果 105
第五章 總結 109
參考文獻 112

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