Chemical Physics Letters ( IF 2.8 ) Pub Date : 2018-01-04 , DOI: 10.1016/j.cplett.2018.01.010 Hassen ben Bechir Dakhlaoui , Nefzi Mouna
In this work, we investigated the effects of polarizations and structural parameters on the optical absorption coefficient (OAC) and the intersubband transition between the three lowest energy levels E1,E2 , and E3 in the MgxZn(1-x)O/ZnO single quantum well. The energy of the electron in each level and its respective wavefunction are calculated by the numerical solution of Schrödinger and Poisson equations self-consistently using an effective mass approximation. Our findings exhibit that the intersubband transitions, ΔE12 and ΔE13 , can be altered and controlled by varying the quantum well width and the magnesium composition, x . Moreover, our results suggest that the optical absorption coefficients, α12 and α13 , can be modulated principally by adjusting the quantum well width, especially the optical absorption coefficient (α12), which presents a red shift by raising the quantum well thickness. Contrary to α12 , the optical absorption coefficient, α13 , can present either a red or a blue shift by increasing the quantum well width. The process responsible for this behavior, which can be suitable for optoelectronic device applications, is discussed here in detail.
中文翻译:
Mg x Zn (1- x) O / ZnO量子阱中量子尺寸和镁成分对光吸收的影响
在这项工作中,我们研究了偏振和结构参数对光吸收系数(OAC)和三个最低能级E 1,E 2之间的子带间跃迁的影响和E 3在Mg x Zn (1- x) O / ZnO单量子阱中。使用有效质量近似,通过自洽的Schrödinger和Poisson方程的数值解来计算每个能级中的电子能量及其相应的波函数。我们的研究结果显示,该间跃迁,ΔE 12和ΔE 13可以通过改变量子阱宽度和镁成分x来改变和控制。此外,我们的结果表明,光学吸收系数,α 12和α 13可以主要通过调节量子阱宽度,尤其是光的吸收系数(被调制α 12),通过增加量子阱的厚度呈现红移。相反,α 12,光吸收系数,α 13可以通过增加量子阱宽度来呈现红色或蓝色偏移。这里详细讨论了负责此行为的过程,该过程可能适用于光电设备应用。