2 research outputs found
Monitoring Deformation in Graphene Through Hyperspectral Synchrotron Spectroscopy to Inform Fabrication
The promise from
graphene to produce devices with high mobilities
and detectors with fast response times is truncated in practice by
strain and deformation originating during growth and subsequent processing.
This work describes effects from graphene growth, multiple layer transfer,
and substrate termination on out of plane deformation, critical to
device performance. Synchrotron spectroscopy data was acquired with
a state-of-the-art hyperspectral large-area detector to describe growth
and processing with molecular sensitivity at wafer length scales.
A study of methodologies used in data analysis discouraged dichroic
ratio approaches in favor of orbital vector approximations and data
mining algorithms. Orbital vector methods provide a physical insight
into mobility-detrimental rippling by identifying ripple frequency
as main actor, rather than intensity; which was confirmed by data
mining algorithms, and in good agreement with electron scattering
theories of corrugation in graphene. This work paves the way to efficient
information from mechanical properties in graphene in a high throughput
mode throughout growth and processing in a materials by design approach