Modeling polarization effects on internal quantum efficiency of micro-LEDs at low current density

An Chi Wei, Ya Lun Liu, Jyh Rou Sze

研究成果: 雜誌貢獻期刊論文同行評審

摘要

This study investigates the optoelectronic properties of blue micro-light-emitting diodes (µ-LEDs) by modeling the semipolar single quantum well (QW) at low current density. Through simulation analyses, the influences of the eight selected crystal orientations and different QW thicknesses on the internal quantum efficiency (IQE) and forward voltage are investigated for low current density LEDs. The simulation results of the energy band diagram show that reversed polarization increases the band tilt in the same direction as the built-in electric field, resulting in IQE poorer than that of LEDs whose polarization is of the same magnitude but positive. However, reversed polarization also reduces the hole barrier height, resulting in lower forward voltage at the same current density. Finally, it is found that weakly positive-polarized ( 10 1 ̄ 2 ) LEDs have the highest IQE and maximum allowed thickness at low current density, which is due to the flat energy band with a reduced band tilt caused by weakly positive polarization.

原文???core.languages.en_GB???
文章編號115104
期刊AIP Advances
13
發行號11
DOIs
出版狀態已出版 - 1 11月 2023

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