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解开点缺陷密度和载体定位增强的Auger重组对 (In,Ga) N/GaN量子井的效率下降的影响
R M Barrett1, J M McMahon2,3, R Ahumada-Lazo1
1Department of Physics & Astronomy & Photon Science Institute, University of Manchester, Manchester M13 9PL, U.K.
在 (In,Ga) N/GaN量子井的效率下降并不取决于点缺陷密度. 原子模型显示,本地化提高了率,匹配实验数据,并建议外部因素限制绿色LED的效率.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 光电学是指光电子产品.
背景情况:
- 在 (In,Ga) N/GaN量子井中的内部量子效率 (IQE) 在蓝色辐射中很高,但在更长的波长和更高的激发率 (效率下降) 中会下降.
- 效率下降限制了发光二极管 (LED) 的亮度.
- 倾斜的拟议机制包括Auger重组,载体逃逸和局部状态的和,但与测量相协调是具有挑战性的.
研究的目的:
- 在 (In,Ga) N/GaN 量子井中研究掉落行为与点缺陷密度的依赖性.
- 开发一个原子模型来理解航母动态和效率下降.
- 在绿色发射量子井中确定限制峰值IQE的因素.
主要方法:
- 实验光发光度测量通过三个不同的成长样本的三个数量级的激发.
- 原子紧固电子结构建模用于计算辐射和奥格尔速率.
- 对载体密度依赖的IQE和衰变动态的分析.
主要成果:
- 发现Droop行为独立于研究量子井的点缺陷密度.
- 原子模型准确地复制了IQE和载体衰变动态的实验测量.
- 在绿色发射量子井中,点缺陷,Auger重组和偏振场将峰值IQE限制在70%左右.
结论:
- 定位增强的辐射和Auger速率对于理解垂落至关重要.
- 外部因素,如载体注入效率和均性,显著影响绿色LED的外部量子效率.
- 这项研究提供了对化物基量子井的效率下降背后的基本机制的见解.
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