Length Distributions of Nanowires Growing by Surface Diffusion

Research output: Contribution to journalArticle

Abstract

We present experimental data on the time and radius-dependent length distributions of Au-catalyzed InAs nanowires grown by metal organic vapor phase epitaxy. We show that these distributions are not as sharp as commonly believed. Rather, they appear to be much broader than Poissonian from the very beginning and spread quickly as the nanowires grow. We develop a model that attributes the observed broadening to the diffusion-induced character of growth. In the initial growth stage, the nanowires are fed from their entire length, leading to a Polya-like length distribution whose standard deviation is proportional to the mean length. After the nanowire length exceeds the adatom diffusion length, the growth acquires a Poissonian character in which the standard deviation scales as a square root of the mean length. We explain why wider nanowires have smaller length dispersion and speculate on the length distributions in Au-catalyzed versus self-catalyzed growth methods.

Details

Authors
Organisations
External organisations
  • St. Petersburg Academic University
  • IBM Research Zurich
  • Leibniz Institute for Crystal Growth
  • Ioffe Physical-Technical Institute of the Russian Academy of Sciences
  • National Research University of Information Technologies
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Materials Engineering
Original languageEnglish
Pages (from-to)2167-2172
Number of pages6
JournalCrystal Growth & Design
Volume16
Issue number4
Publication statusPublished - 2016 Apr 6
Publication categoryResearch
Peer-reviewedYes