Accession Number:

ADA605539

Title:

Smart Core-Shell Nanowire Architectures for Multifunctional Nanoscale Devices

Descriptive Note:

Final rept. 1 Mar 2008-31 Aug 2013

Corporate Author:

DREXEL UNIV PHILADELPHIA PA

Personal Author(s):

Report Date:

2014-02-16

Pagination or Media Count:

15.0

Abstract:

We report on discovery of and strategies for designing new complex oxide materials in which two normally contradictory properties coexist, and its publication. In one example, switchable polar character ferroelectricity arising from non-centrosymmetric structure is achieved in a narrow-gap material through design and synthesis of cation and oxygen vacancy-driven tuning of band gap without loss of polar character. Shown for a single phase solid solution ferroelectric oxide perovskite K,Ba,Ni,NbO3-delta, this material exhibits a compositionally tunable and direct band gap in the range of 1.1 3.8 eV, with potential for novel nonlinear light-matter applications in addition to high-efficiency photovoltaic solar energy conversion. In a second example we report, with collaborators, on the discovery, synthesis and properties of a completely new family of non-perovskite complex oxide that exhibits ferroelectric and antiferromagnetic order. We report on publication of a new thin film synthesis strategy that enables, through epitaxial stabilization, low-energy and highly scalable growth of single-crystal heteroepitaxial complex oxide thin films featuring low-temperature deposition and a brief annealing under wellcontrolled conditions. Finally, we describe progress in using inelastic light scattering, in conjunction with other techniques, to characterize and quantify oxygen vacancy concentrations, including their effects on structure and electronic phase transitions.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE