Open AccessOn the impact of the beveled mesa for GaN-based micro-light emitting diodes: electrical and optical properties
Author(s) -
Sheng Hang,
Zheng Gai,
Chunshuang Chu,
Yonghui Zhang,
Quan Zheng,
Qing Li,
Zi Hui Zhang
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.470703
Subject(s) - bevel , light emitting diode , optoelectronics , materials science , diode , optics , quantum efficiency , photon , electric field , substrate (aquarium) , physics , structural engineering , engineering , oceanography , quantum mechanics , geology
In this report, the impact of different mesa designs on the optical and electrical characteristics for GaN-based micro-light emitting diodes (µLEDs) has been systematically and numerically investigated by using TCAD simulation tools. Our results show that an enhanced light extraction efficiency can be obtained by using beveled mesas. The inclined mesa angles can more effectively reflect the photons to the substrate, and this helps to extract the photons to free air for flip-chip µLEDs. However, it is found that the current injection is influenced by inclination angles for the investigated µLEDs, such that the beveled mesas make stronger charge-coupling effect and increase the electric field magnitude in the multiple quantum wells at the mesa edge, so that the carriers cannot be effective consumed by radiative recombination. As a result, this gives rise to stronger defect-induced nonradiative recombination at mesa surfaces. Therefore, there are tradeoffs between the LEEs and IQEs when changing the beveled angle, to maximize external quantum efficiency for GaN-based µLEDs, the beveled mesa angle shall be carefully designed and optimized.