二維三角晶格結構耦合電極之熱電特性;Thermoelectric properties of finite two dimensional triangular lattices coupled to electrodes

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题名:	二維三角晶格結構耦合電極之熱電特性;Thermoelectric properties of finite two dimensional triangular lattices coupled to electrodes
作者:	林育;Lin, Yu
贡献者:	電機工程學系
关键词:	二維材料;熱電材料;2D matrials;thermoelectric matrials
日期:	2021-07-02
上传时间:	2021-12-07 12:58:31 (UTC+8)
出版者:	國立中央大學
摘要:	本質二維材料吸引了很多研究人員的注意，其三角晶格結構（TLs）造就了特殊的傳輸性質和光學特性，因此十分值得去研究三角晶格耦合電極的能量獲取及熱電特性。二維三角晶格結構的傳輸係數由Green function方程式計算其彈道傳輸。一個重要的發現是電子和電洞在power factor上的不對稱現象，同時電子最大的power factor遠大於電洞的power factor。在室溫下，兩者最大的power factor發生在化學位勢靠近band edge處。Power factor的增加是由於電導的增加以及穩定的Seebeck coefficient。當band gap十倍大於熱能時，適合以one band model預測熱電特性的優化。;Novel intrinsic two dimensional materials attract many research’s attention. The optical properties and unusual transport of these materials mainly origin from the triangular lattices (TLs). As a result, it is desirable for the application of energy harvesting to study the thermoelectric properties of 2D TLs coupled to electrodes. The transmission coefficient of 2D TLs is calculated by using the Green’s function technique for illustrating ballistic transports. One of important finding is the power factor (PF) with an electron-hole asymmetry behavior. Meanwhile, the maximum PF of electrons is significantly larger than that of hole. At room temperature, the maximum PF of electrons is given by the position of chemical potential of electrodes near the band edge of TLs. The enhancement of PF with increasing electronic states results from the constant Seebeck coefficient and enhancement of electrical conductance. When the band gap is ten times larger than thermal energy, the prediction of one-band model to thermoelectric optimization is appropriate.
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