橢偏儀在位表征電化學沉積的係統搭建（二十八）- 中心能量的演變

正文

橢偏儀(yi) 在位表征電化學沉積的係統搭建（二十八）- 中心能量的演變

1.短波範圍

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)。從(cong) 圖4-1(a)中看到，在有自旋能級分裂時，一部分CU₂O激子躍遷將如圖所示。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相應的能量線。可以看到180 s和900s得到了三個(ge) 擬合中心能量，其餘(yu) 時間得到了四個(ge) 中心能量。從(cong) 中心能量與(yu) 橫線的對比中看出，在沉積時間為(wei) 180s時的三個(ge) 中心能量分別為(wei) 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)、E_OC/E_OD和E_1A激子吸收峰；360s出現的前兩(liang) 個(ge) 能量為(wei) E_OA/E_OB激子吸收峰，後兩(liang) 個(ge) 能量分別為(wei) E_OC/E_OD和E_1A激子吸收峰；540s前兩(liang) 個(ge) 能量分別為(wei) E_OC/E_OD和E_1A激子吸收峰，後兩(liang) 個(ge) 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；720s第1個(ge) 能量為(wei) E_OC/E_OD激子吸收峰，中間兩(liang) 個(ge) 為(wei) E_1A激子吸收峰，zui後一個(ge) 能量超過在16eV，可引發E₀、E₁及E₂能帶的躍遷，具體(ti) 屬於(yu) 哪個(ge) 激子吸收峰有待進一步驗證；900s時的三個(ge) 中心能量分別為(wei) E_OC/E_OD、E_1A和E_1B激子吸收峰；1080s的四個(ge) 中心能量分別屬於(yu) E_ODA、E_OC、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.長波範圍

由於(yu) 對0s時和其他沉積時間用的擬合方法是逐點擬合，所以不能得到相應的中心能量值，但是可以通過把擬合得到的值和對應的能量相關(guan) 聯，畫出0s時300nm-800nm及其餘(yu) 時間500nm-800nm的圖，在對曲線線性部分進行擬合，得到的E軸的截距即為(wei) 中心能量，如4-14所示。圖4-14(a)是不同時間得到的在能量為(wei) 1.55-2.48eV範圍曲線，可以看到0s於(yu) 2.1eV後增加較快，且存1處的線性變化段。其餘(yu) 不同沉積時間得到的圖線變化不大，在1.55-2.1eV段與(yu) 0s的重合；在2.1-2.48eV段180s的增加後基本穩定，720s的介於(yu) 180s和其餘(yu) 時間之間。整體(ti) 上認為(wei) 1.55-2.4eV段更多反映的是基底的信息，沒有線性變化的階段。圖4-14(b)是0s時1.55eV-4.13eV的圖線，可看到除了前麵提到的線性擬合段，在後麵2.48-4.13eV段又存在兩(liang) 個(ge) 線性變化的區域，擬合如圖。

圖4-14(c)是0s時3段線性擬合得到的E軸截距，對應於(yu) 材料的能隙或電子的躍遷光吸收。從(cong) 圖可知前兩(liang) 個(ge) 截距在2-3eV之間，zui後一個(ge) 在3-4eV之間，所以0s時對應三個(ge) 能量。前兩(liang) 個(ge) 可能對應Au基底的表麵等離子體(ti) 共振吸收峰，zui後一個(ge) 可能對應3d、4d和6sp的帶間躍遷吸收以及6sp到7sp的導帶間躍遷吸收。

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對應的1.55eV-4.13eV;

(c)0s對應的擬合得到的E軸截距

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