Radial Stark Effect in (In,Ga)N Nanowires

Nano Letters
J LähnemannOliver Brandt

Abstract

We study the luminescence of unintentionally doped and Si-doped InxGa1-xN nanowires with a low In content (x < 0.2) grown by molecular beam epitaxy on Si substrates. The emission band observed at 300 K from the unintentionally doped samples is centered at much lower energies (800 meV) than expected from the In content measured by X-ray diffractometry and energy dispersive X-ray spectroscopy. This discrepancy arises from the pinning of the Fermi level at the sidewalls of the nanowires, which gives rise to strong radial built-in electric fields. The combination of the built-in electric fields with the compositional fluctuations inherent to (In,Ga)N alloys induces a competition between spatially direct and indirect recombination channels. At elevated temperatures, electrons at the core of the nanowire recombine with holes close to the surface, and the emission from unintentionally doped nanowires exhibits a Stark shift of several hundreds of meV. The competition between spatially direct and indirect transitions is analyzed as a function of temperature for samples with various Si concentrations. We propose that the radial Stark effect is responsible for the broadband absorption of (In,Ga)N nanowires across the entire visible range,...Continue Reading

References

Jul 15, 1985·Physical Review. B, Condensed Matter·D A MillerC A Burrus
May 12, 2005·Nano Letters·Raffaella CalarcoHans Lüth
Jun 23, 2011·Nanotechnology·B JenichenA Trampert
Oct 6, 2011·Nanotechnology·Ron Gurwitz, Ilan Shalish
Nov 14, 2012·Nano Letters·Jens WallysMartin Eickhoff
Jan 10, 2013·Nanotechnology·V CardinR Leonelli
Aug 1, 2013·Chemical Communications : Chem Comm·Chih Kai ChenRu-Shi Liu

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