[A-5] UV Sources and Detectors

[A-5-05] Significant Improvement of Injection Efficiency in Deep-UV LD Structures by Light Mg Doping in p-Core Layer

〇Yuri Itokazu^1,2, Noritoshi Maeda¹, Hiroyuki Yaguchi², Hideki Hirayama¹ (1. RIKEN (Japan), 2. Saitama Univ. (Japan))

Presentation style: Online

https://doi.org/10.7567/SSDM.2022.A-5-05

Improvement of injection efficiency is essential to achieve lower threshold and shorter wavelength LDs. We have confirmed that the introduction of electron blocking layer and Mg doping layer into the core layer significantly improves the injection efficiency. In this study, we show that optimizing the Mg doping level in the core layer improves the external quantum efficiency by a factor of about 10 compared to the non-doped sam-ple. This is because the dip in the conduction band due to polarization charge at the core/cladding layer inter-face is suppressed by ionized Mg activated by the Poole-Frenkel effect.