| 摘要: | 在科技迅速發展下，為了滿足現階段全球的能源消耗，利用化石燃料發電所產生的環境問題日益嚴重，過程中產生大量廢氣以及汙染使氣候暖化嚴重加劇，也讓此議題成為許多國家和組織所致力改善的方向。在許多的再生能源中，熱電材料根據Seebeck效應和Peltier效應，利用溫差將熱能轉換為電能以及將電能轉換為熱能的能力，來改善能量消耗以及回收，因此被認為有極大的發展潛力。
在熱電元件中，提高ZT值以及提高轉換效率是許多研究致力發展的重點和方向，利用超晶格材料和複合結構等，來提升電傳導和降低熱傳導，並逐漸應用在廢熱回收、電子元件散熱、航太科技和穿戴式設備等相關領域上，藉此減少對化石燃料的依賴，成為綠色能源中不可忽視的一部分。
本論文中以P-type Mg2(SiSn)熱電材料為研究重點，測試並分析各種橋接金屬對試片電壓和電阻的輸出特性以及接合機械強度的影響，並找出最適合的橋接金屬以及接合方式。將P-type和N-type試片進行接合變為單對PN元件，組成輸出為1V的熱電模組，並分析和量測熱電模組的電性。
結果顯示，P-type Mg2(SiSn)使用橋接金屬銅片和接觸金屬鋁片和銀箔擁有較好的接合強度以及電壓和電阻特性。將P-type試片和接觸金屬一起冷壓成塊材，接著在與橋接金屬銅一同放入高溫爐管退火製程的電壓平均為0.0145942 V，且電阻為0.045 Ω。使用銀漿包覆錫片的方式在P-type和N-type試片的橋接金屬上焊接成五對元件電壓為0.074653V且電阻為0.979 Ω。最終組成60對PN的熱電模組達到輸出為1.12899 V且電阻為19.016 Ω，大幅減少熱電模組的電阻並增加輸出功率。
;With the rapid development of science and technology, in order to meet the current global energy consumption, the environmental problems caused by the use of fossil fuels for power generation are becoming increasingly serious. The large amount of waste gas and pollution generated in the process have seriously aggravated global warming, and this issue has become the direction that many countries and organizations are committed to improving. Among many renewable energy sources, thermoelectric materials are considered to have great development potential by using the Seebeck effect and Peltier effect to convert thermal energy into electrical energy and electrical energy into thermal energy to improve energy recovery and decrease energy consumption.
In thermoelectric elements, improving ZT value and improving conversion efficiency are the focus and direction of many research efforts. Superlattice materials and composite structures are used to improve electrical conduction and reduce thermal conduction, and are gradually applied to waste heat recovery, electronic component heat dissipation, aerospace technology, wearable devices and other related fields, thereby reducing dependence on fossil fuels and becoming an indispensable part of green energy. In this paper, the main focus of this study is P-type Mg₂(SiSn) thermoelectric materials, and the effects of various bridging metals on the output characteristics of the test pieces voltage and resistance and the mechanical strength of the joint were tested and analyzed to identify the most suitable bridging metal and bonding method. The P-type and N-type test pieces were joined to form a single pair of PN elements to form a thermoelectric module with an output of 1V, and the electrical properties of the thermoelectric module were analyzed and measured.
The results showed that P-type Mg2(SiSn) had better bonding strength, voltage and resistance characteristics using bridge metal copper sheets, contact metal aluminum sheets and silver foil. The P-type test piece and the contact metal were cold pressed into a block, and then used high-temperature furnace for annealing with the bridge metal copper to produce a test pieces with average voltage of 0.0145942 V and a resistance of 0.0452 Ω. Five pairs of devices were welded on the bridge metal of the P-type and N-type test pieces using silver paste coated with tin sheets, with a voltage of 0.074653 V and a resistance of 0.979 Ω. Finally, a thermoelectric module composed of 60 pairs of PNs achieved an output of 1.12899 V and a resistance of 19.016 Ω, which greatly reduced the resistance of the thermoelectric module and increased the output power. |
