Seminar by Megan Hill: Total Tomography of III-As Nanowire Emitters: Correlating Composition, Strain, Polytypes, and Properties

Thursday 25 October 2018 15:15 - 16:00
k-space
Published 2018-10-09 18:29 by Jesper Wallentin

Abstract:
Total Tomography of III-As Nanowire Emitters: Correlating Composition, Strain, Polytypes, and Properties

Ternary III-As nanowires offer high efficiency and tunable emission and allow for direct growth on current Si CMOS technology, making them ideal as nanoscale emitters and detectors for on-chip photonic communications. However, these nanoscale heterostructures often exhibit unexpected electrical or optical properties, as composition, strain, and structural polytypes can all modify the bandgap. To deconvolve these factors we correlate 3D composition imaging via Atom Probe Tomography with structure and strain imaging using coherent x-rays, allowing for improved understanding of the nanostructure growth. These nanoscale measurements are also correlated with properties in order to understand the complex nature of III-V nanowire emission.

Megan Hill is a PhD student from Prof. Lincoln Lauhon's group at Northwestern University, USA, visiting for 2 months. Host: Jesper Wallentin