Control of spontaneous emission of quantum dots using correlated effects of metal oxides and dielectric materials
Control of spontaneous emission of quantum dots using correlated effects of metal oxides and dielectric materials
复制标题
利用金属氧化物和介电材料的相关效应控制量子点的自发发射
DOI：
10.1088/1361-6528/aa5779
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发表时间：
2017
期刊：
影响因子：
3.5
通讯作者：
L. Capps
中科院分区：
文献类型：
--
作者：
S. M. Sadeghi;Waylin J Wing;Rithvik R. Gutha;L. Capps
我们研究了在金属氧化物和介电材料的相关影响下半导体量子点的发射动力学。为此，我们使用了分层材料结构，包括一个基础衬底，一个介电层，和一个金属氧化物的介电层。在金属氧化物顶部沉积胶体CdSe/ZnS量子点后，我们使用光谱和时间分辨技术表明，根据介电材料的类型和厚度，金属氧化物可以改变固有激子，缺陷态和环境之间的相互作用，提供新的材料特性。我们的研究结果表明，氧化铝，特别是可以强烈改变非晶硅的量子点的发射动力学的影响，通过平衡本征近带发射和快速捕获的载流子。在这样的系统中，硅/铝氧化物电荷势垒可以导致量子点的辐射寿命的大的变化和量子点中的电子的光喷射速率的控制。这些结果提供了独特的技术来研究和修改量子点的物理性质，并管理量子点的光学和电学性质。
We study the emission dynamics of semiconductor quantum dots in the presence of the correlated impact of metal oxides and dielectric materials. For this we used layered material structures consisting of a base substrate, a dielectric layer, and an ultrathin layer of a metal oxide. After depositing colloidal CdSe/ZnS quantum dots on the top of the metal oxide, we used spectral and time-resolved techniques to show that, depending on the type and thickness of the dielectric material, the metal oxide can characteristically change the interplay between intrinsic excitons, defect states, and the environment, offering new material properties. Our results show that aluminum oxide, in particular, can strongly change the impact of amorphous silicon on the emission dynamics of quantum dots by balancing the intrinsic near band emission and fast trapping of carriers. In such a system the silicon/aluminum oxide charge barrier can lead to large variation of the radiative lifetime of quantum dots and control of the photo-ejection rate of electrons in quantum dots. The results provide unique techniques to investigate and modify physical properties of dielectrics and manage optical and electrical properties of quantum dots.
使用金属氧化物光活性基底探测胶体量子点光诱导特性的结构依赖性。
影响因子：
3.2
作者：
Patty,Kira;Sadeghi,SeyedM;Campbell,Quinn;Hamilton,Nathan;West,RobertG;Mao,Chuanbin
通讯作者：
Mao,Chuanbin