Carrier dynamics of polar, semipolar, and nonpolar InGaN/GaN LEDs measured by small-signal electroluminescence

Daniel F. Feezell; Arman Rashidi; Xuefeng Li; Mohsen Nami; Morteza Monavarian; Elizabeth DeJong; Robert Armitage

doi:10.1117/12.2651482

21 March 2023 Carrier dynamics of polar, semipolar, and nonpolar InGaN/GaN LEDs measured by small-signal electroluminescence

Daniel F. Feezell, Arman Rashidi, Xuefeng Li, Mohsen Nami, Morteza Monavarian, Elizabeth DeJong, Robert Armitage

Author Affiliations +

Proceedings Volume PC12421, Gallium Nitride Materials and Devices XVIII; (2023) https://doi.org/10.1117/12.2651482
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

The carrier dynamics in InGaN/GaN LEDs are directly tied to their efficiency and maximum modulation speed, which are important metrics for solid-state lighting, displays, and optical communication. We measure the carrier dynamics of nonpolar, semipolar, and commercial c-plane InGaN/GaN LEDs using small-signal electroluminescence methods. Rate equations and a small-signal circuit are used to model the carrier dynamics. The model is fit to the optical frequency response and input impedance of the LEDs to extract the carrier lifetimes and the recombination rates. The results offer insight into the underlying causes of efficiency droop and the green gap, and inform device design strategies.

Conference Presentation

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Daniel F. Feezell, Arman Rashidi, Xuefeng Li, Mohsen Nami, Morteza Monavarian, Elizabeth DeJong, and Robert Armitage "Carrier dynamics of polar, semipolar, and nonpolar InGaN/GaN LEDs measured by small-signal electroluminescence", Proc. SPIE PC12421, Gallium Nitride Materials and Devices XVIII, (21 March 2023); https://doi.org/10.1117/12.2651482

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