576 citations · 1.3k across the 12 of their papers we have counts for
8 papers · 1 filter
In-plane thermal diffusivity determination using beam-offset frequency-domain thermoreflectance with a one-dimensional optical heat source
Kai Xu, Jiali Guo, Grazia Raciti +6
We present an innovative contactless method suitable to study in-plane thermal transport based on beam-offset frequency-domain thermoreflectance using a one-dimensional heat source…
Using Pressure to Unravel the Structure-Dynamic-Disorder Relationship in Metal Halide Perovskites
Kai Xu, Luis Pérez-Fidalgo, Bethan L. Charles +3
The exceptional optoelectronic properties of metal halide perovskites (MHPs) are presumed to arise, at least in part, from the peculiar interplay between the inorganic metal-halide…
On the role of the electron-phonon interaction in the temperature dependence of the gap of lead halide perovskites
A. Francisco-López, B. Charles, O. J. Weber +5
Lead halide perovskites are causing a change of paradigm in photovoltaics. Among other peculiarities, these perovskites exhibit an atypical temperature dependence of the fundamenta…
Towards chemically neutral carbon cleaning processes: Plasma cleaning of Ni, Rh, and Al reflective optical coatings and thin Al filters for Free Electron Lasers and synchrotron beamline applications
H. Moreno Fernández, M. Zangrando, G. Sauthier +3
The choice of a reflective optical coating or filter material has to be adapted to the intended field of application. This is mainly determined by the required photon energy range…
Dynamic disorder, phonon lifetimes, and the assignment of modes to the vibrational spectra of methylammonium lead halide perovskites
Aurélien M. A. Leguy, Alejandro R. Goñi, Jarvist M. Frost +11
We present Raman and terahertz absorbance spectra of methylammonium lead halide single crystals (MAPbX3, X = I, Br, Cl) at temperatures between 80 and 370 K. These results show goo…
Lattice dynamics and vibrational spectra of the orthorhombic, tetragonal and cubic phases of methylammonium lead iodide
Federico Brivio, Jarvist M. Frost, Jonathan M. Skelton +7
The hybrid halide perovskite CH3NH3PbI3 exhibits a complex structural behaviour, with successive transitions between orthorhombic, tetragonal and cubic polymorphs at ca. 165 K and…
Optical and mechanical properties of nanofibrillated cellulose: towards a robust platform for next-generation green technologies
Claudia D. Simao, Juan S. Reparaz, Markus. R. Wagner +8
Nanofibrillated cellulose, a polymer that can be obtained from one of the most abundant biopolymers in Nature, is being increasingly explored due to its outstanding properties for…
Evidence of breakdown of the spin symmetry in diluted 2D electron gases
P. Giudici, A. R. Goñi, P. G. Bolcatto +4
Recent claims of an experimental demonstration of spontaneous spin polarisation in dilute electron gases \cite{young99} revived long standing theoretical discussions \cite{ceper99,…