Influences of the p-GaN Growth Temperature on the Optoelectronic Performances of GaN-Based Blue Light-Emitting Diodes
We investigate the influence of p-(Al)GaN growth temperature (T g ) on the optoelectronic performances of InGaN/GaN multiple-quantum-well (MQW) blue light-emitting diodes (LEDs). We systematically combine various characterization techniques, such as current-voltage, current-light output power, capac...
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Veröffentlicht in: | IEEE journal of quantum electronics 2016-04, Vol.52 (4), p.1-8 |
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Sprache: | eng |
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Zusammenfassung: | We investigate the influence of p-(Al)GaN growth temperature (T g ) on the optoelectronic performances of InGaN/GaN multiple-quantum-well (MQW) blue light-emitting diodes (LEDs). We systematically combine various characterization techniques, such as current-voltage, current-light output power, capacitance-voltage (C-V) under forward and reverse biases, photocurrent and electroreflectance (ER) spectroscopies, temperature-dependent electroluminescence, and the internal quantum efficiency (IQE). From the experimental analyses, it is shown that increasing T g induces: 1) the reduced optical loss by the improved crystal quality of the p-GaN layer (improved light extraction efficiency) and 2) the decreased IQE due to the Mg diffusion from the p-(Al)GaN layer to the MQW region. This paper demonstrates that the fine control of the Mg diffusion from the p-GaN layer to the InGaN/GaN MQW region is the key factor for achieving highly efficient blue LEDs. Moreover, a method of estimating the Mg diffusion length is proposed for the first time by analyzing both the C-V curves and the ER spectra under reverse biases. |
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ISSN: | 0018-9197 1558-1713 |
DOI: | 10.1109/JQE.2016.2538730 |