Solid-phase flexibility in Ag2Se semiconductor nanocrystals

Ayaskanta Sahu, Daniele Braga, Oliver Waser, Moon Sung Kang, Donna Deng, David J. Norris

Research output: Contribution to journalArticle

Abstract

Nanocrystals are known to alter the relative stability of bulk solid phases. Here we test the limits of this effect on Ag2Se nanocrystals, a promising new electronic and infrared material. In the bulk, Ag2Se exhibits a solid-solid phase transition to a superionic conducting phase at moderate temperatures. We map this phase transition as a function of size, temperature, and surface treatment in Ag2Se core-only and core-shell nanocrystals. We show that the transition can be tuned not just below but also above the bulk phase-transition temperature. This phase flexibility has implications for applications in optoelectronic and phase-memory devices.

Original languageEnglish (US)
Pages (from-to)115-121
Number of pages7
JournalNano Letters
Volume14
Issue number1
DOIs
StatePublished - Jan 8 2014

Keywords

  • AgSe
  • Semiconductor nanocrystals
  • colloidal quantum dots
  • core-shell
  • phase diagram
  • solid-solid phase transition

ASJC Scopus subject areas

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

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