Multispectral mid-infrared light emitting diodes on a GaAs substrate
Multispectral mid-infrared light emitting diodes on a GaAs substrate
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DOI：
10.1063/1.4986396
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发表时间：
2017-09-04
影响因子：
4
通讯作者：
Cumming, David R. S.
中科院分区：
文献类型：
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作者：
Aziz, Mohsin;Xie, Chengzhi;Cumming, David R. S.
我们设计、模拟和实验演示了四色中红外(Mid-IR)发光二极管(LED)，它们被单片集成到半绝缘的GaAs衬底上的垂直结构中。为了精确控制中红外发射光的峰值波长，采用了基于AlInSb/InSb/AlInSb的量子阱结构。完整的器件结构由三个具有不同势垒宽度的p-QW-n二极管堆叠在一个体相AlInSb p-i-n二极管的顶部组成。包括该器件的外延层被设计成在两个LED之间共享一个接触层。对实现多光谱发光二极管的异质结设计进行了数值模拟，模拟结果与实验结果吻合较好。在室温下进行的电致发光测量证实，每个LED的发射峰值都在不同的波长。体相、2 nm、4 nm和6 nm量子阱LED的峰值波长分别为3.40、3.50、3.95和4.18微米。在零偏压下，傅里叶变换红外光响应测量表明，这些制作的二极管还可以用作中红外光电探测器，截止波长扩展到4.6µm。(C)2017作者(S)。除另有说明外，所有文章内容均受知识共享署名(CC BY)许可证(http://creativecommons.org/licenses/by/4.0/).的许可
We have designed, simulated, and experimentally demonstrated four-colour mid-infrared (mid-IR) Light Emitting Diodes (LEDs) integrated monolithically into a vertical structure on a semi-insulating GaAs substrate. In order to finely control the peak wavelength of the emitted mid-IR light, quantum well (QW) structures based on AlInSb/InSb/AlInSb are employed. The completed device structure consists of three p-QW-n diodes with different well widths stacked on top of one bulk AlInSb p-i-n diode. The epitaxial layers comprising the device are designed in such a way that one contact layer is shared between two LEDs. The design of the heterostructure realising the multispectral LEDs was aided by numerical modelling, and good agreement is observed between the simulated and experimental results. Electro-Luminescence measurements, carried out at room temperature, confirm that the emission of each LED peaks at a different wavelength. Peak wavelengths of 3.40 mu m, 3.50 mu m, 3.95 mu m, and 4.18 mu m are observed in the bulk, 2 nm, 4 nm, and 6 nm quantum well LEDs, respectively. Under zero bias, Fourier Transform Infrared photo-response measurements indicate that these fabricated diodes can also be operated as mid-IR photodetectors with an extended cut-off wavelength up to 4.6 mu m. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).