title: An enhanced surface passivation effect in InGaN/GaN disk-in-nanowire light emitting diodes for mitigating Shockley-Read-Hall recombination.
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.
authors.affiliation: Photonics Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia. boon.ooi@kaust.edu.sa.
authors.forename: Chao
authors.initials: C
authors.lastname: Zhao
authors.forename: Tien Khee
authors.initials: TK
authors.lastname: Ng
authors.forename: Aditya
authors.initials: A
authors.lastname: Prabaswara
authors.forename: Michele
authors.initials: M
authors.lastname: Conroy
authors.forename: Shafat
authors.initials: S
authors.lastname: Jahangir
authors.forename: Thomas
authors.initials: T
authors.lastname: Frost
authors.forename: John
authors.initials: J
authors.lastname: O'Connell
authors.forename: Justin D
authors.initials: JD
authors.lastname: Holmes
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Parbrook
authors.forename: Pallab
authors.initials: P
authors.lastname: Bhattacharya
authors.forename: Boon S
authors.initials: BS
authors.lastname: Ooi