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10.4%的外部量子效率 294nm紫外线LED在20A/cm2具有完全透明的道结口

Michael Wang, Wenting Gong, Feng Wu

|June 14, 2025

概括

研究人员使用金属有机化学蒸气沉积 (MOCVD) 开发了一种透明的紫外线发光二极管 (UV LED). 这种新型的紫外线LED实现了高外部量子效率 (EQE) 对于杀菌应用.

科学领域:

材料科学材料科学材料科学
光电学是指光电子产品.
半导体物理半导体物理

背景情况:

开发高效的杀菌紫外线发光二极管 (UV LED) 对消毒和绝育等应用至关重要.
透明道连接 (TJ) 是通过促进电流传播和减少电压下降来提高UV LED性能的重要组成部分.
金属有机化学蒸汽沉积 (MOCVD) 是制造高质量的半导体设备的关键技术.

研究的目的:

为了证明一个完全由MOCVD培养的,完全透明的道结 (TJ) 杀菌UVLED.
优化MOCVD生长过程以提高LED性能.
研究特定的AlGaN组合和结构对TJ和UVLED特征的影响.

主要方法:

使用全金属有机化学蒸汽沉积 (MOCVD) 来制造设备.
采用轻微添加的n-AlGaN接触层,以实现MOCVD快速增长的优化.
设计了一个最佳的道结结构,包括p++/n++-AlGaN层和AlGaN/AlGaN的短周期超级网格 (SPSL).

主要成果:

在294nm TJ UV LED中达到12.1%的峰值外部量子效率 (EQE).
观察到的高EQE值为10.4%在20 A/cm2和9.1%在35 A/cm2.
记录了1.5V的过电压在1A/cm2,表明有效的电流传输.

结论:

成功展示了一种完全透明的TJ紫外线LED,完全由MOCVD种植.
优化的基于AlGaN的TJ结构和MOCVD生长条件显著提高了UV LED的性能.
这一进步为高效可靠的杀菌性紫外线光源带来了希望.

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相关概念视频

UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.

P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...