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Published May 18, 2020 | Accepted Version + Published
Journal Article Open

Controlling the dopant profile for SRH suppression at low current densities in λ ≈ 1330 nm GaInAsP light-emitting diodes


The quantum efficiency of double hetero-junction light-emitting diodes (LEDs) can be significantly enhanced at low current density by tailoring the spatial profile of dopants to suppress Shockley–Read–Hall recombination. To demonstrate this effect, we model, design, grow, fabricate, and test a GaInAsP LED (λ≈ 1330 nm) with an unconventional dopant profile. Compared against that of our control design, which is a conventional n⁺-n-p⁺ double hetero-junction LED, the dopant profile near the n-p⁺ hetero-structure of the design displaces the built-in electric field in such a way that the J₀₂ space charge recombination current is suppressed. The design principle generalizes to other material systems and could be applicable to efforts to observe and exploit electro-luminescent refrigeration at practical power densities.

Additional Information

© 2020 Published under license by AIP Publishing. Submitted: 31 January 2020; Accepted: 6 May 2020; Published Online: 22 May 2020. Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request. Dr. Ping-Show Wong of OEpic performed the metalorganic chemical vapor deposition (MOCVD) epitaxial growth. Room temperature PL spectra were acquired in collaboration with Dr. Tomás Sarmiento in the lab of Professor Jelena Vuckovic. Tom Carver deposited the n-metal Ti/Pt/Au. Dr. Michelle Sherrott helped diagnose an early p-metal issue. Professor Eric Pop provided advice and aid in characterization facilities access. The selective wet etch recipes were based on suggestions from Dr. Vijay Jayaraman of Praevium Research, Inc. This work was supported by the U.S. Department of Energy (DoE) "Light-Material Interactions in Energy Conversion" Energy Frontier Research Center (EFRC) under Grant No. DE-SC0001293 and the U.S. DoE "Photonics at Thermodynamic Limits" EFRC under Grant No. DE-SC0019140.

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Published - 5.0002058.pdf

Accepted Version - 2001.10948.pdf


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August 19, 2023
October 20, 2023