Quantitative analysis of leakage current in III-nitride micro-light-emitting diodes

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2025-01-28 DOI:10.1063/5.0250282

Matthew S. Wong, Tanay Tak, Andrea Y. Ni, Kent Nitta, Srinivas Gandrothula, JaeKwon Kim, NamGoo Cha, Umesh K. Mishra, James S. Speck, Steven P. DenBaars

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Abstract

The electrical characteristics under forward- and reverse-bias conditions of III-nitride blue and green micro-light-emitting diodes (μLEDs) are analyzed. A fitting model is proposed to determine the contributions of reverse leakage current and the effectiveness of sidewall treatments. Moreover, the forward-bias currents of the μLEDs are examined using the extracted ideality factor to examine the impacts of sidewall defects. The results show that sidewall treatments are highly effective for suppression of leakage currents. From the efficiency perspective, higher wall-plug efficiency (WPE) than external quantum efficiency (EQE) is observed when the operating voltage is lower than the photon voltage in both blue and green 20 × 20 μm2 devices. This enhancement of the WPE over the EQE is due to the suppression of Shockley–Read–Hall (SRH) nonradiative recombination. These observations indicate that μLEDs with sidewall treatments not only improve optical performance but also further enhance the electrical performance of devices by suppressing the leakage current paths due to SRH nonradiative recombination processes.

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iii -氮化物微发光二极管泄漏电流的定量分析

分析了iii -氮化物蓝色和绿色微发光二极管（μ led）在正偏置和反向偏置条件下的电特性。提出了一个拟合模型来确定反漏电流的贡献和侧壁处理的有效性。此外，利用提取的理想因子对μ led的正向偏置电流进行了检测，以考察侧壁缺陷的影响。结果表明，侧壁处理能有效抑制泄漏电流。从效率的角度来看，在20 × 20 μm2的蓝绿器件中，当工作电压低于光子电压时，壁插效率（WPE）高于外量子效率（EQE）。WPE相对于EQE的增强是由于抑制了Shockley-Read-Hall （SRH）非辐射复合。这些结果表明，经过侧壁处理的μ led不仅提高了器件的光学性能，而且通过抑制SRH非辐射复合过程引起的泄漏电流通路，进一步提高了器件的电性能。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.