| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7940822 | Superlattices and Microstructures | 2017 | 11 Pages |
Abstract
In0.16Ga0.84N/In0.05Ga0.95N Multiple Quantum Well (MQW) structure grown on a 70Â nm thick high quality semi-bulk InGaN buffer layer is reported. Temperature dependent photoluminescence (PL) reveals 67.5% of room temperature Internal Quantum Efficiency (IQE) at an emission peak of â¼455Â nm with FWHM of 20Â nm. Low temperature PL study shows clear improvement in emission intensity when conventional GaN buffer and GaN barrier are replaced by semi-bulk InGaN buffer in addition with InGaN barrier. Simulation confirms improved IQE and reduced efficiency droop when using semi-bulk as buffer which is attributed to the improved overlapping of electron-hole wave functions due to the reduced internal electric field from counteraction by surface polarization field. This efficiency improvement is very beneficial for high In content green LEDs where the efficiency is limited by polarization induced Quantum Confined Stark Effect (QCSE) for excess indium content.
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Authors
Saiful Alam, Suresh Sundaram, Miryam Elouneg-Jamroz, Xin Li, Youssef El Gmili, Ivan Christophe Robin, Paul L. Voss, Jean-Paul Salvestrini, Abdallah Ougazzaden,