Current Crowding in a High-Efficiency Black Phosphorus Light-Emitting Diode Using a Reflective Back Contact.

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-07-18 DOI:10.1021/acs.nanolett.5c01829

Julien Brodeur, Éloïse Rahier, Mathieu Chartray-Pronovost, Étienne Robert, Oussama Moutanabbir, Stéphane Kéna-Cohen

引用次数: 0

Abstract

We demonstrate a high-performance mid-infrared (MIR) light-emitting diode (LED) based on a black phosphorus (b-P)/n-MoS₂ heterojunction. A gold back contact combined with a rhenium-doped n-type MoS₂ layer is used to enhance light extraction. The device shows a MIR peak external quantum efficiency (EQE) of (1.6 ± 0.2)% at room temperature and a record (7.0 ± 0.5)% EQE at 77 K, with a maximum radiant power density of (108 ± 8) W/cm². Finite-element simulations highlight the importance of phonon-assisted band-to-band tunneling under reverse bias and the influence of carrier velocity saturation under forward bias. The simulations also reveal that the high ideality factors extracted from the current-voltage characteristic are due to current crowding at the heterojunction and a consequence of the device geometry. These findings establish a new high-performance b-P LED architecture and provide crucial insights into the physics of MIR sources based on 2D materials.

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利用反射背触点的高效黑磷发光二极管中的电流拥挤。

我们展示了基于黑磷(b-P)/n-MoS2异质结的高性能中红外（MIR）发光二极管（LED）。采用金背触点结合掺铼的n型二硫化钼层来增强光提取。该器件在室温下的MIR峰值外量子效率（EQE）为（1.6±0.2）%，在77 K时达到创纪录的（7.0±0.5）%，最大辐射功率密度为（108±8）W/cm2。有限元模拟强调了反向偏压下声子辅助带间隧道的重要性以及正向偏压下载流子速度饱和的影响。仿真还表明，从电流-电压特性中提取的高理想因数是由于异质结处的电流拥挤和器件几何形状的结果。这些发现建立了一种新的高性能b-P LED架构，并为基于2D材料的MIR光源的物理特性提供了重要见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.