Enhanced emission from mid-infrared AlInSb light-emitting diodes with p-type contact grid geometry

Meriggi, L., Steer, M. J., Ding, Y., Thayne, I. G. , MacGregor, C., Ironside, C. N. and Sorel, M. (2015) Enhanced emission from mid-infrared AlInSb light-emitting diodes with p-type contact grid geometry. Journal of Applied Physics, 117(6), 063101. (doi:10.1063/1.4905081)

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Abstract

We report on the impact of lateral current spreading on light emission from aluminium indium antimonide (AlInSb) mid-infrared p-i-n light-emitting diodes (LEDs) grown by molecular beam epitaxy on a GaAs substrate. Due to the high effective mass of holes in Al xIn1−x Sb, the resistivity of p-type material determines the 3-D distribution of current flow in the devices. This work shows that maximum light emission, as measured by electroluminescence, and 3-times wall-plug efficiency improvement were obtained at room temperature from devices with a p-type contact grid geometry with a spacing of twice the current spreading length in the p-type material, which was measured by spatially resolved photocurrent. The LED with the optimal contact geometry exhibits improved performance at high injection current levels thanks to the more uniform carrier distribution across the device area.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ironside, Professor Charles and Steer, Dr Matthew and Thayne, Professor Iain and Ding, Dr Ying and Sorel, Professor Marc
Authors: Meriggi, L., Steer, M. J., Ding, Y., Thayne, I. G., MacGregor, C., Ironside, C. N., and Sorel, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Applied Physics
Publisher:AIP Publishing
ISSN:0021-8979
ISSN (Online):1089-7550

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
605791Novel light sources and detectors for mid-IR gas sensors powered by energy harvestingCharles IronsideTechnology Strategy Board (TSB) (TSB)101259ENG - ENGINEERING ELECTRONICS & NANO ENG
586711EPSRC CASE 2011: Modelling and prototyping of Antimonide based Light Emitting Diode and Photodiode Devices for Gas Sensing ApplicationsIain ThayneEngineering & Physical Sciences Research Council (EPSRC)11330185/EP/J50ENG - ENGINEERING ELECTRONICS & NANO ENG