椭偏仪在位表征电化学沉积的系统搭建（二十八）- 中心能量的演变

正文

椭偏仪在位表征电化学沉积的系统搭建（二十八）- 中心能量的演变

1.短波范围

图4-13是CU₂O激迁图(b)和300nm-500nm拟合得到的不同沉积时间中心能量值(a)。从图4-1(a)中看到，在有自旋能级分裂时，一部分CU₂O激子跃迁将如图所示。图(a)是在300nm-500nm波段用四振子Lorentz Oscillator+Drude模型拟合得到的不同沉积时间下的中心能量以及代表了不同类型的激子激发相应的能量线。可以看到180 s和900s得到了三个拟合中心能量，其余时间得到了四个中心能量。从中心能量与横线的对比中看出，在沉积时间为180s时的三个中心能量分别为E_OA/E_OB(E_OA/E_OB表示该能量是E_OA或者E_OB激子吸收峰)、E_OC/E_OD和E_1A激子吸收峰；360s出现的前两个能量为E_OA/E_OB激子吸收峰，后两个能量分别为E_OC/E_OD和E_1A激子吸收峰；540s前两个能量分别为E_OC/E_OD和E_1A激子吸收峰，后两个能量可能是E1B激子吸收峰，同时也可能是E2能级上的电子跃迁吸收峰；720s第1个能量为E_OC/E_OD激子吸收峰，中间两个为E_1A激子吸收峰，zui后一个能量超过在16eV，可引发E₀、E₁及E₂能带的跃迁，具体属于哪个激子吸收峰有待进一步验证；900s时的三个中心能量分别为E_OC/E_OD、E_1A和E_1B激子吸收峰；1080s的四个中心能量分别属于E_ODA、E_OC、E_OD 和E_1A激子吸收峰。

图4-13 (a)300nm-500nm拟合得到的不同沉积时间中心能量值;

(b)CU₂O激子跃迁图

2.长波范围

由于对0s时和其他沉积时间用的拟合方法是逐点拟合，所以不能得到相应的中心能量值，但是可以通过把拟合得到的值和对应的能量相关联，画出0s时300nm-800nm及其余时间500nm-800nm的图，在对曲线线性部分进行拟合，得到的E轴的截距即为中心能量，如4-14所示。图4-14(a)是不同时间得到的在能量为1.55-2.48eV范围曲线，可以看到0s于2.1eV后增加较快，且存1处的线性变化段。其余不同沉积时间得到的图线变化不大，在1.55-2.1eV段与0s的重合；在2.1-2.48eV段180s的增加后基本稳定，720s的介于180s和其余时间之间。整体上认为1.55-2.4eV段更多反映的是基底的信息，没有线性变化的阶段。图4-14(b)是0s时1.55eV-4.13eV的图线，可看到除了前面提到的线性拟合段，在后面2.48-4.13eV段又存在两个线性变化的区域，拟合如图。

图4-14(c)是0s时3段线性拟合得到的E轴截距，对应于材料的能隙或电子的跃迁光吸收。从图可知前两个截距在2-3eV之间，zui后一个在3-4eV之间，所以0s时对应三个能量。前两个可能对应Au基底的表面等离子体共振吸收峰，zui后一个可能对应3d、4d和6sp的带间跃迁吸收以及6sp到7sp的导带间跃迁吸收。

图4-14 随E的变化及不同波段拟合

(a) 不同时间1.55-2.48eV;

(b)0s对应的1.55eV-4.13eV;

(c)0s对应的拟合得到的E轴截距

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