Auger Recombination in III-Nitride Nanowires and Its Effect on Nanowire Light-Emitting Diode Characteristics

Wei Guo, Meng Zhang, Pallab Bhattacharya, Junseok Heo

Research output: Contribution to journalArticlepeer-review

146 Scopus citations

Abstract

We have measured the Auger recombination coefficients in defect-free InGaN nanowires (NW) and InGaN/GaN dot-in-nanowire (DNW) samples grown on (001) silicon by plasma-assisted molecular beam epitaxy. The nanowires have a density of ∼1×1011 cm-2 and exhibit photoluminescence emission peak at λ ∼ 500 nm. The Auger coefficients as a function of excitation power have been derived from excitation dependent and time-resolved photoluminescence measurements over a wide range of optical excitation power density. The values of C0, defined as the Auger coefficient at low excitation, are 6.1 × 10-32 and 4.1×10-33 cm6·s-1 in the NW and DNW samples, respectively, which are in reasonably good agreement with theoretical predictions for InGaN alloy semiconductors. Light-emitting diodes made with the NW and DNW samples exhibit no efficiency droop up to an injection current density of 400 A/cm 2. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1434-1438
Number of pages5
JournalNano Letters
Volume11
Issue number4
DOIs
StatePublished - Apr 13 2011
Externally publishedYes

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