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橢偏儀在位表征電化學沉積的係統搭建(二十三)- 全波段沉積過程的準在位測試分析-不同沉積時間所對應的

發布時間:2024-05-06 15:13:43 瀏覽量:1299 作者:Alex

摘要

依據實驗組前期對CU2O薄膜沉積的實驗,選擇-0.4mA進行兩(liang) 電極的恒流沉積,並用橢偏儀(yi) 進行在位監測,每沉積180s後進行300nm到800nm的橢偏測試。即在沉積180s、360s、540s、720s、900s、1080s後分別進行了橢偏儀(yi) 全譜測試,測試角度為(wei) 70°。

正文


橢偏儀(yi) 在位表征電化學沉積的係統搭建(二十三)- 全波段沉積過程的準在位測試分析-不同沉積時間所對應的橢偏參數


1、不同沉積時間所對應的橢偏參數Psi、Delta、R


圖4-5是得到的不同沉積時間橢偏參數Psi和Delta及反射率R隨著波長的變化,對比0s的圖線,Psi、Delta、α及R值在整體(ti) 上都是減小的,整體(ti) 趨勢較相似,但存在峰位的增加及峰位的移動。從(cong) 圖4-5(a、e)來看,與(yu) 0s相比,不同沉積時間Psi值隨波長的變化趨勢的大致相同。不同沉積時間的Psi值在300nm到500nm波段變化較小,相較於(yu) 0s時在330nm處出現峰位。沉積時間為(wei) 180s時,波長在500-800nm的長波範圍,其值從(cong) 襯底的44°減小到30°左右。在沉積時間增加到540s、900s、1080s時,在約540nm處出現一個(ge) 較明顯的波包。不同時間測試得到的Psi值有變化,這也意味測試的基底表麵發生了變化。圖4-5(b、f)中顯示橢偏參數Delta值隨著時間的變化與(yu) 橢偏參數Psi的趨勢一致。在長波500-800nm的範圍內(nei) 得到的不同時間的Delta值從(cong) Au襯底所對應120°減小到70°附近。當沉積時間增加到540s、900s、1080s時,約在540nm處出現較明顯的峰位。Delta值同樣顯示出測試基底表麵發生了改變。圖4-5(c、g)是吸收係數α隨不同沉積時將隨波長的變化,和0s相比,整體(ti) 上變化趨勢相似,但是在數值及吸收波包上存在變化。在300-500nm波段不同沉積時間變化趨勢及數值比較接近,且都在大約330nm處出現新的吸收波包。在500-800nm波段,540s、900s、1080s都在500-550nm波段出現新的波包且隨著時間的增加存在紅移現象。數值的變化及新的吸收波包的出現,可能是由於(yu) 沉積的CU2O帶來的,有待進一步驗證。圖4-5(d、h)中顯示反射係數R值隨著時間的變化,其變化規律和吸收率相似。當沉積時間為(wei) 180s的時候,R的值大約從(cong) Au基底的1附近降為(wei) 0.3左右,在波長為(wei) 300-500nm之間存在兩(liang) 個(ge) 波包(330nm,400nm),在波長為(wei) 500-800nm之間存在兩(liang) 個(ge) 波包(540nm,630nm)。當沉積時間為(wei) 360s時與(yu) 180s的曲線很接近,但是在長波500-800nm減為(wei) 1個(ge) 較明顯的波包,大約在600nm附近。當沉積時間增加到540s時,在500nm-800nm範圍出現兩(liang) 個(ge) 比180s更大的波包(510nm,660nm)。到720s時,R值隨波長的變化與(yu) 360s一致。到900s和1080s時,R值隨波長的變化與(yu) 540s一致,但500nm到800nm的兩(liang) 個(ge) 波包峰位有所變化。總體(ti) 上看,在短波段R值隨著沉積時間的變化十分微小且曲線比較光滑,但是在長波段會(hui) 隨著沉積時間的不同上下波動且曲線本身也存在波動。說明長波對基底表麵變化更敏感,對測試信息影響更大。對比文獻中Au的反射率知道其在長波段的反射率接近1與(yu) 0s時的R相似,故認為(wei) 在沒有沉積之前整個(ge) 池體(ti) 橢偏數據主要反應的是Au基底的信息。與(yu) 沉積0s相比,不同沉積時間的反射率R減小,說明Au襯底的信息減少,這是由於(yu) CU2O的沉積導致。


圖4-5不同沉積時間(180s,360s,720s,1080s)的橢偏數據:

(a,e)Psi;

(b,f)Delta;

(c,g)α;

(d,h)R


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