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橢偏儀在位表征電化學沉積的係統搭建(二十五)- 全波段沉積過程的準在位測試分析-介電常數

發布時間:2024-05-07 09:57:18 瀏覽量:959 作者:Alex

摘要

依據實驗組前期對薄膜沉積的實驗,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(二十五)- 全波段沉積過程的準在位測試分析-介電常數


介電常數()

圖4-7(a,c)是不同沉積時間介電常數實部e1隨波長變化圖,與(yu) 折射率n的趨勢相似。隨著時間的變化,值發生變化。當沉積時間為(wei) 180s的時候,在500-800nm長波範圍,其值從(cong) 襯底的-20增加到-0.5,這也意味著新的物質沉積,導致襯底的信息減少。在沉積時間增加到360s和540s時,整體(ti) 上值比180s減小了3左右,在350nm附近出現一個(ge) 較明顯的波包,同時在550nm附近出現一個(ge) 波包。當沉積時間增加到720s之後,的值恢複到沉積180s附近,但是在500-800nm波段稍小,且在500nm附近出現波包。沉積時間為(wei) 900s時,值的變化和720s一致,但是出現的波包位置大概在530nm附近。當時間為(wei) 1080s時,在300-500nm波段其值和720s一樣,在長波段稍大,且出現了500nm和600nm附近的兩(liang) 個(ge) 波包。從(cong) 圖4-7(a,c)可以看出隨著沉積的變化,沉積的CU2O導致值在500-600nm的時候有額外的峰出現,且和吸收係數一樣存在紅移現象。


圖4-7(b,d)是不同沉積時間下測得的介電常數虛部,隨著時間的變化,值發生變化。當沉積時間為(wei) 180s的時候,在500-800nm的長波範圍,其值大概從(cong) 襯底的0增加到4,同樣也意味著新的物質沉積,導致襯底的信息減少。在沉積時間增加到360s時,和180s比,出現了兩(liang) 個(ge) 比較明顯的波包,大約在400nm和590nm附近。當沉積時間增加到540s之後,的值隨著波長減小,在600nm到800nm波段接近0,且在470nm和550nm附近出現了波包。沉積時間為(wei) 720s時,其變化和360s一致,但是出現的波包位置大概在400nm和550nm附近且波包變得更大。當時間為(wei) 900s時,在300-500nm波段其值和360s一樣,在400nm、500nm和600nm附近出現波包。時間為(wei) 1080s時,變換趨勢和900s相同,隻是波包在400nm、530nm和680nm附近出現。從(cong) 圖4-7(b,d)可以看出隨著沉積的變化,沉積的CU2O導致值在540s的時候zui為(wei) 特殊,可能是由於(yu) 沉積厚度引起。同樣的,也使得在500nm-600nm波段有新的峰出現,它也歸因於(yu) 沉積物的出現。


圖4-7不同沉積時間得到的橢偏數據圖(a,c),(b,d)


圖4-8是相對於(yu) 0s時不同沉積時間的改變Δ隨波長的變化圖。可以看到相對於(yu) 沒有沉積時,除了540s以外,其餘(yu) 的Δ在300到530±20nm波段為(wei) 負值,在530±20到800nm波段為(wei) 正值,且變化趨勢一致。540s的Δ在整個(ge) 波段除了580nm和660nm兩(liang) 個(ge) 點以外都是負值,但是在整體(ti) 上的變化趨勢和其餘(yu) 時間大致一樣。說明隨著時間增加,沉積表麵對光的響應一直在變化,故而沉積的物相及表麵粗糙度在變化。


圖4-8相對於(yu) 0s時不同沉積時間的改變Δ隨波長的變化圖


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