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標題: | 室溫濺鍍與雷射退火之銅鋁氧化物薄膜特性分析 Properties of room-temperature sputtered and laser annealed copper-aluminum oxide thin films |
作者: | Chang-Yi Tsai 蔡昌益 |
指導教授: | 陳奕君(I-Chun Cheng) |
共同指導教授: | 陳建彰(Jian-Zhang Chen) |
關鍵字: | 銅鋁氧化物,雷射,濺鍍, CuAlO2,laser,sputtered, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | 銅鋁氧化物是頗具應用潛力之p型透明導電材料。然而在低溫製程下所得的銅鋁氧化物往往電性不佳,且呈現非晶態,故我們嘗試摻雜鈣來增加其薄膜的電性,並以雷射退火調變能量參數來增加薄膜的結晶狀態,以期得到更有利用價值的銅鋁氧化物薄膜。
本實驗利用射頻磁控濺鍍機,沉積摻雜不同含量鈣之薄膜,量測其電性及光學性質。以Ca0.2CuAl0.8O2靶材沉積之薄膜,具有最佳電性,seebeck 係數為255~270(μV/K),電阻率為110(Ω-cm),可見光平均穿透率為26%(厚度200nm)。 本實驗接著利用雷射退火增加薄膜結晶狀態,並以X光繞射儀(XRD)分析結晶性,以二次離子質譜儀(SIMS)觀察薄膜成份。雷射退火後,CaxCuAl2-xO2靶材沉積之薄膜不易改善其結晶性,而CaxCuAl1-xO2靶材沉積之薄膜,結晶性隨著能量增加有所提升。以Ca0.2CuAl0.8O2靶材沉積之薄膜,其最大晶粒約為21.2nm,且有CuAlO2、Al2O3及Cu2O之相產生;薄膜成份則隨著雷射能量增加而有顯著改變,由直接沉積時Cu:Al≒2:1轉變為Cu:Al≒1:2;可見光平均穿透率則隨雷射能量上升至166(mJ/cm2)而提升至51%(厚度200nm),其電阻率為917(Ω-cm)。 因薄膜電阻率隨著雷射能量增強而增加,所以最後選用未退火導電率最高Ca0.2CuAl0.8O2靶材沉積之薄膜配搭氧化鋅薄膜來製作雙極性接面電晶體元件,由於Ca0.2CuAl0.8O2靶材沉積之薄膜載子濃度過低1015~1016 /cm3,β值僅達~1.1,所以我們進一步使用載子濃度達5x1019 /cm3的氧化鎳來取代銅鋁氧化物,製作出的雙極性接面電晶體,其β值達166,平均可見光穿透率為39%。 Copper aluminum oxide is one of the interesting p-type transparent conducting oxides. It can be obtained at room temperature by RF magnetron sputtering on glass. However, the as-deposited copper alumina oxide thin films are amorphous and has poor electrical propertied. In this study, calcium was used as dopant to improve the electrical properties. In addition, we also applied excimer laser to enhance the film crystallinity. Thin films were sputtered from copper aluminum oxide targets doped with various amount of calcium, and their electrical properties, such as electrical resistivity, seebeck coefficient, and optical properties were evaluated. We found that thin films sputtered from Ca0.2CuAl0.8O2 targets had best electrical properties. Their electrical resistivities and seebeck coefficients are 110Ω-cm and 255~270μV/K, respectiviely. An average optical transmittance in the visible light region of 26% (200nm-thick) was obtained. To improve the film crystallinity, thin films were annealed by excimer laser. By XRD analysis, we found that it was not easy to improve the films deposited from CaxCuAl2-xO2 targets, while the crystallinity of thin films deposited from CaxCuAl1-xO2 targets ameliorated significantly after laser irradiation. Thin films deposited from Ca0.2CuAl0.8O2 targets had the largest grain size of 21nm; howerver, Al2O3 and Cu2O phase were observed in addition to CuAlO2 phase. The SIMS analysis showed that the atomic composition ratio of thin films deposited from Ca0.2CuAl0.8O2 targets were changed from Cu:Al≒1:2 to Cu:Al≒2:1 after laser irradiation. Thin films deposited from Ca0.2CuAl0.8O2 targets with resistivity of 917Ω-cm and the highest average optical transmittance in the visible light region of 51% were obtained by laser irradiation of 166mJ/cm2 . Because the laser irradiation deteriorated the electrical property of the thin films, we used as-deposited Ca-doped Ca0.2CuAl0.8O2 thin films for device fabrication. However, the carrier concentration of 1015 ~ 1016 /cm3 was too low, a β value of 1.1 was obtained. To improve the device performance, NiO thin films with carrier concentration of 5x1019 /cm3 was used to replace Ca-doped Ca0.2CuAl0.8O2 thin films. A β value of 166 and an average optical transmittance in the visible light region of 39% were obtained. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/42354 |
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