Dr. Vladimir Protasenko Profile

Dr. Vladimir Protasenko

at Cornell Univ

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Proceedings Article | 5 March 2021 Presentation + Paper

Enhanced efficiency in bottom tunnel junction InGaN blue LEDs

Len van Deurzen, Shyam Bharadwaj, Kevin Lee, Vladimir Protasenko, Henryk Turski, Huili (Grace) Xing, Debdeep Jena

Proceedings Volume 11706, 117060F (2021) https://doi.org/10.1117/12.2582439

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The physics of the bottom tunnel junction (BTJ) and its improvement over standard p-up geometry in InGaN blue LEDs is quantified through pulsed power measurements. It is found that the peak external quantum efficiency (EQE) and wall-plug efficiency (WPE) for a p-down BTJ LED is about threefold that of its counterpart, the p-up top tunnel junction (TTJ) LED. This is contributed to increased radiative recombination and reduced electron overflow. Further, the peaks occur at lower current densities for the BTJ device, suggesting earlier saturation of Shockley-Read-Hall traps. In the droop regime, where electron overflow, device heating, and 3-particle interactions are significant, the performance of the BTJ is found to be consistently better than that of the TTJ, converging at large current densities where the polarization fields are screened.

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