Naval Research Laboratory, Washington, D.C. 20375, USA.
Nano Lett. 2010 Jan;10(1):313-7. doi: 10.1021/nl903592h.
We explore how the size and shape of the microscopic confinement potential affects the nonradiative Auger decay rate of confined carriers. Calculations conducted in the two-band, effective mass Kane model unambiguously show that smoothing out the confinement potential could reduce the rate by more than 3 orders of magnitude relative to the rate in structures with abruptly terminating boundaries. As the confinement potential width is increased, the calculated rate decreases overall, exhibiting very deep minima at regular widths. Such minima suggest that nanocrystals of "magic sizes" can exist for which nonradiative Auger processes are strongly suppressed.
我们探讨了微观限制势的大小和形状如何影响被限制载流子的非辐射俄歇衰减率。在双带有效质量 Kane 模型中进行的计算明确表明，与具有突然终止边界的结构相比，平滑限制势可以将速率降低 3 个数量级以上。随着限制势宽度的增加，计算出的速率总体上减小，在规则宽度处表现出非常深的最小值。这些最小值表明，可能存在“魔术尺寸”的纳米晶体，其中非辐射俄歇过程受到强烈抑制。
