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Solid-Phase Flexibility in Ag2Se Nanocrystals

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Sahu Ayaskanta, Braga Daniele, Waser Oliver, Kang Moon Sung, Deng Donna, Norris David J.,
Project Electronic Impurity Doping of Semiconductor Nanocrystals
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Original article (peer-reviewed)

Journal Nano Letters
Volume (Issue) 14
Page(s) 115 - 121
Title of proceedings Nano Letters
DOI 10.1021/nl4041498

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.
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