在热化水热 ZnO 中长寿命刺激子
Patrik Ščajev1, Daniela Gogova2,3
1Institute of Photonics and Nanotechnology, Faculty of Physics, Vilnius University, Saulėtekio Ave. 3, LT-10257, Vilnius, Lithuania.
Heliyon
|February 23, 2024
概括
热显著增强ZnO晶体的特性,提高紫外线发光的量子效率到70%,并将刺激子的寿命延长到40 ns. 这种改进源于减少了载体陷,使化 ZnO 适用于光电子设备.
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:
- 水热培养的ZnO晶体经常遭受载体陷,限制了它们的光电子性能.
- 激发器寿命和光发光 (PL) 量子效率是基于ZnO的设备的关键参数.
研究的目的:
- 为了研究热对水热 ZnO 水晶的光电子特性的影响.
- 为了将刺激子动态和陷状态的变化与火诱导的改进相关联.
主要方法:
- 水热 ZnO 水晶的热.
- 光发光 (PL) 光谱测量量子效率和衰变时间.
- 探针光谱法以确定激子的寿命,扩散和吸收截面.
- 分析与缺陷相关的PL和缓慢衰变尾巴.
主要成果:
- 实现了70%的PL量子效率,并将刺激子的寿命从80 psi延长到40 ns.
- 降低了数量级的载体陷密度,由较弱的缺陷PL和减少缓慢衰变尾巴证明.
- 确定了刺激子扩散系数 (0.5 cm2/s),扩散长度 (1.4 μm) 和吸收截面 (9 × 10−18 cm2).
- 计算的表面重组速度 (500厘米/秒) 和双分子重组系数 (0.7 × 10−11厘米/秒).
结论:
- 热回火有效地减少了水热 ZnO 中的陷状态,显著提高了刺激子寿命和 PL 量子效率.
- 化 ZnO 具有有利的特性,包括长激子扩散长度,使其适合发光二极管和激光器.
- 了解陷动力学和激子行为对于优化ZnO用于先进的光电子应用至关重要.
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