Title |
An enhanced surface passivation effect in InGaN/GaN disk-in-nanowire light emitting diodes for mitigating Shockley–Read–Hall recombination
|
---|---|
Published in |
Nanoscale, January 2015
|
DOI | 10.1039/c5nr03448e |
Pubmed ID | |
Authors |
Chao Zhao, Tien Khee Ng, Aditya Prabaswara, Michele Conroy, Shafat Jahangir, Thomas Frost, John O'Connell, Justin D. Holmes, Peter J. Parbrook, Pallab Bhattacharya, Boon S. Ooi |
Abstract |
We present a detailed study of the effects of dangling bond passivation and the comparison of different sulfide passivation processes on the properties of InGaN/GaN quantum-disk (Qdisk)-in-nanowire based light emitting diodes (NW-LEDs). Our results demonstrated the first organic sulfide passivation process for nitride nanowires (NWs). The results from Raman spectroscopy, photoluminescence (PL) measurements, and X-ray photoelectron spectroscopy (XPS) showed that octadecylthiol (ODT) effectively passivated the surface states, and altered the surface dynamic charge, and thereby recovered the band-edge emission. The effectiveness of the process with passivation duration was also studied. Moreover, we also compared the electro-optical performance of NW-LEDs emitting at green wavelength before and after ODT passivation. We have shown that the Shockley-Read-Hall (SRH) non-radiative recombination of NW-LEDs can be greatly reduced after passivation by ODT, which led to a much faster increasing trend of quantum efficiency and higher peak efficiency. Our results highlighted the possibility of employing this technique to further design and produce high performance NW-LEDs and NW-lasers. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
---|---|---|
United Kingdom | 1 | 2% |
Ireland | 1 | 2% |
Korea, Republic of | 1 | 2% |
Unknown | 60 | 95% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Student > Ph. D. Student | 19 | 30% |
Student > Master | 11 | 17% |
Researcher | 7 | 11% |
Student > Doctoral Student | 2 | 3% |
Student > Postgraduate | 2 | 3% |
Other | 7 | 11% |
Unknown | 15 | 24% |
Readers by discipline | Count | As % |
---|---|---|
Engineering | 15 | 24% |
Physics and Astronomy | 13 | 21% |
Materials Science | 12 | 19% |
Chemistry | 2 | 3% |
Nursing and Health Professions | 2 | 3% |
Other | 2 | 3% |
Unknown | 17 | 27% |