摘 要
本文藉著穿透光實驗,可以得到奈米晶體的吸收係數對入射光能量的譜圖。從譜圖中得到奈米晶體裡電子電洞對的躍遷能量。並將此結果與粒子在無限位能井理論模型計算的躍遷能量與共振強度作比較。得知奈米晶體電子電洞對的躍遷能量與共振強度會受到尺寸大小的量子侷限效應而有躍遷能量隨著尺寸變小而藍移的現象;另外奈米晶體形狀(不同形狀的奈米晶體會有不同的波函數)也會對躍遷能量有所影響;而奈米晶體表面的覆蓋層所形成的表面態對晶體內部的電子電洞對能態會有紅移的現象。
另一方面,當奈米晶體尺寸縮小到數個奈米時,能隙值就會因此開始變大,所以除了量子侷限效應會造成躍遷能量的藍移,能隙值變大亦是藍移的重要原因之一。
綜合以上的因素,可奈米晶體內電子電洞對要遷能量的偏移,除了要考慮尺寸效應,還有奈米晶體形狀與覆蓋層的影響。
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