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Li MY, Sui M, Kim ES, et al. Effect of Au thickness on the evolution of self-assembled Au droplets on GaAs (111)A and (100). Nanoscale Res Lett. 2014;9(1):407doi: 10.1186/1556-276X-9-407.
Li, M. Y., Sui, M., Kim, E. S., & Lee, J. (2014). Effect of Au thickness on the evolution of self-assembled Au droplets on GaAs (111)A and (100). Nanoscale research letters, 9(1), 407. https://doi.org/10.1186/1556-276X-9-407
Li, Ming-Yu, et al. "Effect of Au thickness on the evolution of self-assembled Au droplets on GaAs (111)A and (100)." Nanoscale research letters vol. 9,1 (2014): 407. doi: https://doi.org/10.1186/1556-276X-9-407
Li MY, Sui M, Kim ES, Lee J. Effect of Au thickness on the evolution of self-assembled Au droplets on GaAs (111)A and (100). Nanoscale Res Lett. 2014 Aug 20;9(1):407. doi: 10.1186/1556-276X-9-407. eCollection 2014. PMID: 25170335; PMCID: PMC4141912.
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Nanoscale Res Lett. 2014 Aug 20;9(1):407. doi: 10.1186/1556-276X-9-407. eCollection 2014.

Effect of Au thickness on the evolution of self-assembled Au droplets on GaAs (111)A and (100).

Nanoscale research letters

Ming-Yu Li, Mao Sui, Eun-Soo Kim, Jihoon Lee

Affiliations

  1. College of Electronics and Information, Kwangwoon University, Nowon-gu, Seoul 139-701, South Korea.
  2. College of Electronics and Information, Kwangwoon University, Nowon-gu, Seoul 139-701, South Korea ; Institute of Nanoscale Science and Engineering, University of Arkansas, Fayetteville, AR 72701, USA.

PMID: 25170335 PMCID: PMC4141912 DOI: 10.1186/1556-276X-9-407

Abstract

In this paper, we report the effect of Au thickness on the self-assembled Au droplets on GaAs (111)A and (100). The evolution of Au droplets on GaAs (111)A and (100) with the increased Au thickness progress in the Volmer-Weber growth mode results in distinctive 3-D islands. Under an identical growth condition, depending on the thickness of Au deposition, the self-assembled Au droplets show different size and density distributions, while the average height is increased by approximately 420% and the diameter is increased by approximately 830%, indicating a preferential lateral expansion. Au droplets show an opposite evolution trend: the increased size along with the decreased density as a function of the Au thickness. Also, the density shifts on the orders of over two magnitude between 4.23 × 10(10) and 1.16 × 10(8) cm(-2) over the thickness range tested. At relatively thinner thicknesses below 4 nm, the self-assembled Au droplets sensitively respond to the thickness variation, evidenced by the sharper slopes of dimensions and density plots. The results are systematically analyzed and discussed in terms of atomic force microscopy (AFM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), cross-sectional surface line profiles, and Fourier filter transform (FFT) power spectra.

Keywords: Au thickness; GaAs surfaces; Self-assembled droplets; Size and density evolution

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