橢偏儀(yi) 在位監測中,裝置的設計是重點,要考慮池體(ti) 的大小、溶液的容量、光路經過的介質、電極的放置等問題,本章主要介紹實驗裝置的設計、改進以及對應的一些測試實驗。
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橢偏儀(yi) 在位表征電化學沉積的係統搭建(十四)- 在位監控裝置的設計
之前簡要介紹了在鍍Au的矽片基底上用電化學方法沉積Cu2O薄膜並進行橢偏測試的製備過程、表征方法和實驗中所用的試劑及設備,對基底電極Au/Si清洗和製備過程進行了詳細描寫(xie) ,接著介紹了形貌表征及電化學測試等手段,如:橢偏儀(yi) 測試與(yu) 建模擬合,X-ray進行對樣品的物相分析,SEM可觀察薄膜的微觀形貌。這些測試可以分析出Cu2O薄膜的光學形貌等特點。
而在橢偏儀(yi) 在位監測中,裝置的設計是重點,要考慮池體(ti) 的大小、溶液的容量、光路經過的介質、電極的放置等問題,本章主要介紹實驗裝置的設計、改進以及對應的一些測試實驗。
3.1開放容器
在開始設計裝置之前,用玻璃培養(yang) 皿進行了實驗,實驗的目的是看不同溶液厚度對橢偏儀(yi) 所測數據的影響。以醋酸鈉、醋酸鉛(1MNaCH3COO、10mMPbPb[CH3COO]2)為(wei) 溶液,鍍金矽(Au/Si)為(wei) 基底,進行不同溶液厚度的橢偏測試。
把25px×30px的Au/Si基底放入直徑為(wei) 260px的培養(yang) 皿底,其厚度0.53mm,則體(ti) 積是0.064cm3。經過計算光經過溶液後打在基底上再返回,要使得在溶液中經過的光程是25px、50px、75px、100px、125px和150px,則要向對應培養(yang) 皿中加入18.9cm3、33.5cm3、48.0cm3、62.5cm3、77.1cm3和91.6cm3的溶液。在培養(yang) 皿中先後加入上述體(ti) 積的溶液,進行入射角度為(wei) 70°,波長範圍為(wei) 300nm-800nm的橢偏測量,測試得到的橢偏參數如圖3-1所示。
圖3-1不同溶液厚度的橢偏儀(yi) 測試(a)Psi;(b)Delta
從(cong) 圖3-1(a)可知,隨著溶液的加入,溶液中的光程從(cong) 0變化到150px。其中光程為(wei) 25px、75px時測得的結果比0時要小,且曲線趨勢也不同;光程為(wei) 50px、100px、125px、150px時測得的數據比0時要大,且曲線的變化趨勢大致相同,隨著溶液的增加,差值增加,但是在加到5、150px時達到了極值,從(cong) 圖中可以看到5、150px時結果靠得非常近。
從(cong) 圖3-1(b)圖可知,隨著溶液的加入,溶液中的光程從(cong) 0變化到150px。其中光程為(wei) 25px,75px時測得的結果比0時要小,且曲線趨勢和也相同。光程為(wei) 50px、100px、125px、150px時測得的數據比0時要大,且曲線的變化趨勢大致相同,隨著溶液的增加,差值增加,但是在加到5、150px時達到了極值,從(cong) 圖中可以看到125px、150px時結果靠得非常近。
綜上所述,加入透明溶液對基底進行測試是可行的,但是溶液厚度會(hui) 對測量結果帶來數值上的上下移動,溶液達到一定厚度後測試得到的數據會(hui) 趨於(yu) 穩定。在該波段溶液的存在會(hui) 帶來數據的波動。雖然敞開器皿作為(wei) 池體(ti) 很簡單方便,但是它也存在溶液敞開會(hui) 有溶液紊動,且存在測試時間長、溶液易被汙染等對測試不利的因素,故需要重新設計其他電解池。
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