Electrical injection in longitudinal and coaxial heterostructure nanowires: A comparative study through a three-dimensional simulation

D. Li, C. Z. Ning

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We carried out a comparative study of electrical injection in longitudinal p-i-n and coaxial p-n core-shell nanowires by performing a three-dimensional numerical simulation. In the case of the core-shell structure, we show that both electrons and holes of high density can be efficiently injected into and confined in the structure even without an i-region. The required bias voltage and doping concentrations in the core-shell structure are smaller than those in the longitudinal p-i-n structure to achieve the same carrier injection level. Furthermore, we show that a type-I band alignment, as required in traditional p-i-n structure is not necessary in core-shell structure, allowing more flexibility in nanowire devices design. Our results thus provide a theoretical foundation and understanding that a core-shell structure is far superior to the longitudinal p-i-n structure for electrical injection nanowire lasers.

Original languageEnglish (US)
Pages (from-to)4234-4237
Number of pages4
JournalNano Letters
Volume8
Issue number12
DOIs
StatePublished - Dec 2008

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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