Enhanced output power of gan-based resonance cavity light-emitting diodes with optimized ITO design
Journal
Journal of Lightwave Technology
Journal Volume
29
Journal Issue
24
Pages
3757-3763
Date Issued
2011
Author(s)
Abstract
We fabricated and measured GaN-based resonant cavity light-emitting diodes with a 30 nm thick Indium tin oxide (ITO) thin film as a transparent contact layer. Four different ITO structures on p-type GaN samples were deposited by sputter and e-gun, and the corresponding device performance was compared. Each of these four samples has been annealed by its optimal parameters. The ITO thin film deposited by sputter demonstrated better electrical characteristics, surface morphology, specific contact resistance, and the overall device light output compared to those of the e-gun samples. Between the two sputtered ITO types, the hybrid type shows higher roll-over current density of 14 kA/cm 2, and the output power is increased from 15 to 39μW. From statistical data of the 2-D light intensity under the same current, we saw the lateral current spreading of the pure crystalline ITO by sputter is worst. The hybrid type, which combines the crystalline and amorphous ITO, has the best overall performance when we consider all the electrical, optical, and metrology measurements. From these results, we believe the 30 nm thick hybrid ITO thin film has the best potential to be applied in light emitting devices such as light-emitting diodes, laser diodes, etc. © 2011 IEEE.
Subjects
Current spreading; GaN; Indium tin oxide (ITO); Resonance cavity light-emitting diodes (RCLEDs)
SDGs
Other Subjects
Contact layers; Current spreading; Device performance; Electrical characteristic; GaN; Hybrid type; Indium tin oxide (ITO); Indium tin oxide thin films; ITO thin films; Lateral currents; Light emitting devices; Light intensity; Light output; Optimal parameter; Output power; P-type GaN; Resonance cavities; Resonance cavity light-emitting diodes (RCLEDs); Resonant cavity; Specific contact resistances; Statistical datas; Cavity resonators; Crystalline materials; Diodes; Gallium alloys; Gallium nitride; Indium; Indium compounds; Light emission; Optimization; Thick film devices; Thin films; Tin; Tin oxides; Light emitting diodes
Type
journal article