以X光吸收光譜探討Cu2Se相關材料之電子與原子結構

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 學位論文 > Item 987654321/105246

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题名:	以X光吸收光譜探討Cu2Se相關材料之電子與原子結構
其它题名:	Electronic and structural properties of Cu2Se related materials studied by X-ray absorption spectroscopy
作者:	游家源;You, Jia-Yuan
贡献者:	淡江大學物理學系碩士班張經霖;Chang, C. L.
关键词:	Cu2Se;XANES;EXAFS;熱電材料;thermoelectric material
日期:	2015
上传时间:	2016-01-22 14:51:21 (UTC+8)
摘要:	本文主要為針對半導體熱電材料Cu2Se以及其相關材料分別為：降低Cu濃度以及摻雜Ni之X光吸收近邊緣結構(X-ray Absorption Near Edge Structure，XANES)和延伸X光吸收精細結構(Extended X-ray Absorption Fine Structure，EXAFS)數據分析。結果指出降低Cu濃度後Cu價數及主要載子電洞隨之增加，進而增加其導電性；而反螢石結構之非常態Cu的分佈改變降低其聲子熱導。摻雜Ni後原本不參與電子轉移的Se將參與電子轉移，電子由Cu轉移至Ni，而其反螢石結構晶格之靜態亂序增加將降低其聲子熱導。 This article is mainly for the semiconductor and related materials thermoelectric materials Cu2Se. We compare the sample concentration changes and doping with the absorption spectroscopy of X-ray Absorption Near Edge Structure and Extended X-ray Absorption Fine Structure. The results indicate that after we reduce the concentration of Cu, its main hole-carriers and Cu valence increases, thereby increasing its electrical conductivity. The change in the distribution of antifluorite structure of Cu reduce its phonon thermal conductivity as we reduce the concentration of Cu. Se is not involved in electron transfer, but doped Ni, Se will participate in electron transfer, electron transfer from Cu to Ni, and its antifluorite structure of the static lattice disorder increase will reduce the phonon thermal conductivity.
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