Point defects and blue LED efficiency: the critical role of indium

Thomas Weatherley; Wei Liu; Camille Haller; Yao Chen; Duncan T. L. Alexander; Jean-François Carlin; Raphaël Butté; Nicolas Grandjean

doi:10.1117/12.2576683

5 March 2021 Point defects and blue LED efficiency: the critical role of indium

Thomas Weatherley, Wei Liu, Camille Haller, Yao Chen, Duncan T. L. Alexander, Jean-François Carlin, Raphaël Butté, Nicolas Grandjean

Author Affiliations +

Proceedings Volume 11706, Light-Emitting Devices, Materials, and Applications XXV; 1170609 (2021) https://doi.org/10.1117/12.2576683
Event: SPIE OPTO, 2021, Online Only

Abstract

The success story of blue light-emitting diodes over the past decade is underpinned by the high internal quantum efficiency (IQE) of the InGaN/GaN quantum wells (QWs) within the active region. Yet this extraordinary IQE can only be achieved by adding an indium-containing layer before the QWs—the “underlayer” (UL). In this work, we evidence that any indium-containing III-nitride layer acts to incorporate surface defects; the UL hence acts as a getter for surface defects to avoid their incorporation into the QWs as IQE-reducing point defects (PDs). We directly observe the reduction in PD-density caused by increasing the UL thickness.

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Citation Download Citation

Thomas Weatherley, Wei Liu, Camille Haller, Yao Chen, Duncan T. L. Alexander, Jean-François Carlin, Raphaël Butté, and Nicolas Grandjean "Point defects and blue LED efficiency: the critical role of indium", Proc. SPIE 11706, Light-Emitting Devices, Materials, and Applications XXV, 1170609 (5 March 2021); https://doi.org/10.1117/12.2576683

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