量子點奈米線之熱電特性;Thermoelectric properties of quantum dot nanowires

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Title:	量子點奈米線之熱電特性;Thermoelectric properties of quantum dot nanowires
Authors:	童禹謀;Tung, Yu-Mou
Contributors:	電機工程學系
Keywords:	量子點;奈米線;熱電特性;Thermoelectric;quantum dot;nanowires
Date:	2019-06-26
Issue Date:	2019-09-03 15:49:31 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文探討了在線性響應下和金屬電極相連的量子點超晶格奈米線(SLNW)的熱電特性。對於短SLNW，我們討論不同的Transmission Functions (TFs) 對熱電係數的影響，當熱離子輔助穿隧程序(TATP)支配電極間電子傳輸時，quasi-square shape有比boxcar shape大的功率因數。對於長SLNW，席貝克係數 (Seebeck coefficient)不受電子穿隧率及能階簡併的影響，這是與電導率和電子熱導率不同的。而當電極的費米能量位於次能帶之間的間隙時，該區域中的熱電效率受到鄰近效應的抑制。在TATP中的熱電效率比直接隧穿程序大得多，因為席貝克係數在直接穿隧程序中的值非常小。最後，我們已經證明，由於TATP中能階簡併態的增加，熱電優值也得到了提升。;We theoretically study the thermoelectric properties of quantum dot nanowire (SLNW) connected to electrodes in the linear regime. For a short SLNW, we clarify the effects of different Transmission Functions (TFs) on the thermoelectrical coefficients. When thermionic assisted tunneling procedure (TATP) dominates electron transport between electrodes, the power factor given by TF with quasi-square shape is larger than that of TF with boxcar shape. Unlike electrical conductance and electron thermal conductance, the Seebeck coefficient is a very robust thermoelectrical quantity with respect to electron tunneling rate, energy level fluctuation and energy level degeneracy for a long SLNW. When the Fermi energy of electrodes locates at gap between subbands, thermoelectric efficiency in this region is sup-pressed by the proximity effect. The thermoelectric efficiency is much large in TATP than in direct tunneling procedure, because the Seebeck coefficient is much small in the direct tunneling procedure. Finally, we have demonstrated that the figure of merit is enhanced due to increase of energy level degeneracy in the TATP.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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