电流扩散层对带圆形触点的倒装芯片氮化镓 LED 内部量子效率和光功率的影响

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2024-10-09 DOI:10.1016/j.ijleo.2024.172073

Y. Prasamsha , N. Mohankumar , M. Arun Kumar , P. Sriramani , H. Maity , Nitin Rakesh

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引用次数: 0

摘要

氧化铟锡（ITO）的独特性质使其成为倒装芯片发光二极管（FCLED）和其他光电设备中电流扩散层的绝佳选择。本文通过一个精确的数学模型来分析 FCLED 的性能，即在圆形触点下 ITO 层产生的电流扩散长度 (Ls)。在提取内部量子效率 (IQE,ηint)、光功率 (Pint) 和发射强度 (EI) 时，使用 ABC 模型无近似地列出了表达式。在不同的电流密度下，改变 ITO 层的厚度（tITO）和电阻率（ρITO），并确定它们对 IQE 的不利影响。在电流密度较低时，IQE 随厚度增加而增加，而在 ITO 层电阻率较高时，IQE 则随厚度增加而减少。在较高的电流密度下，由于 "效率下降 "的原因，无论是否存在 ITO 层，IQE 都会逐渐下降。在厚度为 50-200 nm、电流密度为 8 A/cm2 的情况下，所提出的工作的 IQE 为 82%，光功率约为 40 mW，与实验数据显示出良好的一致性，使其成为未来高性能 FCLED 的可行方案。

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Effect of current spreading layer on Internal Quantum efficiency and optical power of flip chip gallium nitride LEDs with circular contacts

The unique properties of the Indium Tin Oxide (ITO) make it an excellent choice as a current spreading layer in Flip Chip Light Emitting Diodes (FCLEDs) and other optoelectronic devices. Herein, the performance of FCLEDs is analyzed by a precise mathematical model for the current spreading length (L_s) produced by the ITO layer under circular-shaped contacts. The expressions are formulated without approximations using ABC-model for extracting the Internal Quantum Efficiency (IQE,

η_{int}

), optical power (P_int) and Emission Intensity (EI). The thickness

(t_{I T O})

and resistivity

(ρ_{I T O})

of the ITO layer are varied for different current densities, and their adverse effects on IQE are determined. At lower current densities, IQE increases with thickness and decreases for high resistivity of the ITO layer. At higher current densities, there is a gradual decrease in IQE irrespective of the ITO layer presence due to “Efficiency Droop”. The IQE in the proposed work is 82 % at a thickness of 50–200 nm and current density of 8 A/cm², and the optical power is around 40 mW, showing good agreement with the experimental data, making it feasible for future high-performance FCLEDs.

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来源期刊

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.