In this study, the advanced manipulability of wave functions in a type-II multi-shell hetero-nanostructure (MS-HNS) and the tunability of radiative exciton lifetime over a wide range with and/or without changing in transition energies has been demonstrated by the band edge engineering. For this purpose, the electronic and optical properties of exciton (X) and biexciton (XX) in a spherical CdS/ZnSe/ZnTe/CdSe HNS have been explored in detail. In the calculations, effects of all Coulombic interactions between the charges have been taken into account on the wave functions. Moreover, in the case of XX, the exchange–correlation potential between the same charged particles has also been considered. The results have been presented as a function of CdS core radius and ZnSe shell thickness and the probable physical reasons have been discussed in detail.

在这项研究中，II 型多壳异质纳米结构 (MS-HNS) 中波函数的先进可操作性以及在有和/或没有跃迁能变化的情况下在宽范围内的辐射激子寿命的可调谐性已通过带边工程。为此目的，在球形 CdS/ZnSe/ZnTe/CdSe HNS中激子 (X) 和双激子 (XX) 的电子和光学性质已经进行了详细的探索。在计算中，电荷之间的所有库仑相互作用对波函数的影响都被考虑在内。此外，在 XX 的情况下，还考虑了相同带电粒子之间的交换相关电位。结果已作为 CdS 核心半径和 ZnSe 壳层厚度的函数呈现，并且已详细讨论了可能的物理原因。