Influence of surface nano-patterning on the placement of InAs quantum dots

Del Gaudio, D.; Aagesen, L. K.; Huang, S.; Johnson, T. M.; Faeth, B. D.; Lu, H.; Ziff, R. M.; Goldman, R. S.

doi:10.1063/1.5008518

Title: Influence of surface nano-patterning on the placement of InAs quantum dots

Journal Article · 20 September 2018 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.5008518 · OSTI ID:1566375

^[1]; Aagesen, L. K. ^[1]; Huang, S. ^[1]; Johnson, T. M. ^[1]; Faeth, B. D. ^[2];

^[1];

^[1]

Univ. of Michigan, Ann Arbor, MI (United States)
Cornell Univ., Ithaca, NY (United States)

We have examined the influence of spontaneous nano-patterning on the placement of InAs quantum dots (QDs) on (Al)GaAs surfaces using an experimental-computational approach. Both atomically flat and mounded surfaces, generated via a surface instability induced by the Ehrlich- Schwoebel barrier, are employed as templates for the subsequent deposition of InAs QDs. Using height profiles from atomic-force micrographs, we simulate QD deposition with a 2D phase field model, which describes the time evolution of the InAs layer driven by a chemical potential gradient. For flat surfaces, phase-field simulations result in QD densities comparable to experimental observations. For mounded surfaces, the simulations reveal QDs preferentially positioned in regions of positive curvature (substrate valleys), e.g., at the edge of surface mounds, consistent with the anisotropic QD placement observed experimentally. We discuss the role of curvaturedriven diffusion in the spontaneous ordering of QDs, demonstrating the applicability of this mechanism to AlGaAs mounds.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0000957

OSTI ID:: 1566375

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 124; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Influence of surface nano-patterning on the placement of InAs quantum dots

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