4.7 Article

Emission characteristics of GaInN/GaN multiple quantum shell nanowire-based LEDs with different p-GaN growth conditions

期刊

NANOPHOTONICS
卷 10, 期 13, 页码 3441-3450

出版社

WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0210

关键词

current injection; GaInN/GaN multiple-quantum-shells; nanowires; NW-LEDs; p-GaN shell; TEG flow rate

资金

  1. MEXT Program for research and development of next-generation semiconductor to realize energy-saving society [JPJ005357]
  2. MEXT Private University Research Branding Project
  3. JSPS KAKENHI [15H02019, 17H01055, 16H06416]
  4. Japan Science and Technology CREST [16815710]

向作者/读者索取更多资源

The study explores the effects of different p-GaN shell growth conditions on the emission characteristics of MQS NW-LEDs, showing that thick p-GaN shells can influence the emission peak and light output. By utilizing a high growth rate of p-GaN shell, the current injection into both the r- and m-planes of NW structures is enhanced, leading to improved light output and EL peak intensity of NW-LEDs. Additionally, the high growth rate of p-GaN shell can suppress dislocations and defects at the apex, inhibiting current injection in nonradiative recombination centers near the c-plane.
Improving current injection into r- and m-planes of nanowires (NWs) is essential to realizing efficient GaInN/GaN multiple quantum shell (MQS) NW-based light-emitting diodes (LEDs). Here, we present the effects of different p-GaN shell growth conditions on the emission characteristics of MQS NW-LEDs. Firstly, a comparison between cathodoluminescence (CL) and electroluminescence (EL) spectra indicates that the emission in NW-LEDs originates from the top region of the NWs. By growing thick p-GaN shells, the variable emission peak at around 600 nm and degradation of the light output of the NW-LEDs are elaborated, which is attributable to the localization of current in the c-plane region with various In-rich clusters and deep-level defects. Utilizing a high growth rate of p-GaN shell, an increased r-plane and a reduced c-plane region promote the deposition of indium tin oxide layer over the entire NW. Therefore, the current is effectively injected into both the r- and m-planes of the NW structures. Consequently, the light output and EL peak intensity of the NW-LEDs are enhanced by factors of 4.3 and 13.8, respectively, under an injection current of 100 mA. Furthermore, scanning transmission electron microscope images demonstrate the suppression of dislocations, triangular defects, and stacking faults at the apex of the p-GaN shell with a high growth rate. Therefore, localization of current injection in nonradiative recombination centers near the c-plane was also inhibited. Our results emphasize the possibility of realizing high efficacy in NW-LEDs via optimal p-GaN shell growth conditions, which is quite promising for application in the long-wavelength region.

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