橢偏儀在位表征電化學沉積的系統(tǒng)搭建（二十八）- 中心能量的演變

正文

橢偏儀在位表征電化學沉積的系統(tǒng)搭建（二十八）- 中心能量的演變

1.短波范圍

圖4-13是CU₂O激遷圖(b)和300nm-500nm擬合得到的不同沉積時間中心能量值(a)亥鬓。從圖4-1(a)中看到完沪，在有自旋能級分裂時，一部分CU₂O激子躍遷將如圖所示嵌戈。圖(a)是在300nm-500nm波段用四振子Lorentz Oscillator+Drude模型擬合得到的不同沉積時間下的中心能量以及代表了不同類型的激子激發(fā)相應(yīng)的能量線覆积。可以看到180 s和900s得到了三個擬合中心能量熟呛，其余時間得到了四個中心能量技健。從中心能量與橫線的對比中看出，在沉積時間為180s時的三個中心能量分別為E_OA/E_OB(E_OA/E_OB表示該能量是E_OA或者E_OB激子吸收峰)惰拱、E_OC/E_OD和E_1A激子吸收峰啊送；360s出現(xiàn)的前兩個能量為E_OA/E_OB激子吸收峰，后兩個能量分別為E_OC/E_OD和E_1A激子吸收峰欣孤；540s前兩個能量分別為E_OC/E_OD和E_1A激子吸收峰馋没，后兩個能量可能是E1B激子吸收峰，同時也可能是E2能級上的電子躍遷吸收峰降传；720s第1個能量為E_OC/E_OD激子吸收峰篷朵，中間兩個為E_1A激子吸收峰，zui后一個能量超過在16eV婆排，可引發(fā)E₀声旺、E₁及E₂能帶的躍遷，具體屬于哪個激子吸收峰有待進一步驗證段只；900s時的三個中心能量分別為E_OC/E_OD腮猖、E_1A和E_1B激子吸收峰；1080s的四個中心能量分別屬于E_ODA赞枕、E_OC澈缺、E_OD 和E_1A激子吸收峰。

圖4-13 (a)300nm-500nm擬合得到的不同沉積時間中心能量值;

(b)CU₂O激子躍遷圖

2.長波范圍

由于對0s時和其他沉積時間用的擬合方法是逐點擬合炕婶，所以不能得到相應(yīng)的中心能量值姐赡，但是可以通過把擬合得到的值和對應(yīng)的能量相關(guān)聯(lián)，畫出0s時300nm-800nm及其余時間500nm-800nm的圖柠掂，在對曲線線性部分進行擬合，得到的E軸的截距即為中心能量涯贞，如4-14所示枪狂。圖4-14(a)是不同時間得到的在能量為1.55-2.48eV范圍曲線，可以看到0s于2.1eV后增加較快肩狂，且存1處的線性變化段。其余不同沉積時間得到的圖線變化不大姥饰，在1.55-2.1eV段與0s的重合傻谁；在2.1-2.48eV段180s的增加后基本穩(wěn)定，720s的介于180s和其余時間之間列粪。整體上認為1.55-2.4eV段更多反映的是基底的信息审磁，沒有線性變化的階段。圖4-14(b)是0s時1.55eV-4.13eV的圖線岂座，可看到除了前面提到的線性擬合段态蒂，在后面2.48-4.13eV段又存在兩個線性變化的區(qū)域，擬合如圖费什。

圖4-14(c)是0s時3段線性擬合得到的E軸截距钾恢，對應(yīng)于材料的能隙或電子的躍遷光吸收。從圖可知前兩個截距在2-3eV之間，zui后一個在3-4eV之間瘩蚪，所以0s時對應(yīng)三個能量泉懦。前兩個可能對應(yīng)Au基底的表面等離子體共振吸收峰，zui后一個可能對應(yīng)3d疹瘦、4d和6sp的帶間躍遷吸收以及6sp到7sp的導帶間躍遷吸收崩哩。

圖4-14 隨E的變化及不同波段擬合

(a) 不同時間1.55-2.48eV;

(b)0s對應(yīng)的1.55eV-4.13eV;

(c)0s對應(yīng)的擬合得到的E軸截距

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