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Experimental and theoretical evidence for hydrogen doping in polymer solution-processed indium gallium oxide.
Proc Natl Acad Sci U S A
August 2020
Department of Chemistry, Northwestern University, Evanston, IL 60208;
The field-effect electron mobility of aqueous solution-processed indium gallium oxide (IGO) thin-film transistors (TFTs) is significantly enhanced by polyvinyl alcohol (PVA) addition to the precursor solution, a >70-fold increase to 7.9 cm/Vs. To understand the origin of this remarkable phenomenon, microstructure, electronic structure, and charge transport of IGO:PVA film are investigated by a battery of experimental and theoretical techniques, including In K-edge and Ga K-edge extended X-ray absorption fine structure (EXAFS); resonant soft X-ray scattering (R-SoXS); ultraviolet photoelectron spectroscopy (UPS); Fourier transform-infrared (FT-IR) spectroscopy; time-of-flight secondary-ion mass spectrometry (ToF-SIMS); composition-/processing-dependent TFT properties; high-resolution solid-state H, Ga, and In NMR spectroscopy; and discrete Fourier transform (DFT) analysis with ab initio molecular dynamics (MD) liquid-quench simulations.
View Article and Find Full Text PDFBiGa(SeO): A Phase Matchable SHG Material Achieved by Cation Substitution.
Inorg Chem
June 2020
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
The search of novel second-harmonic generation crystals in gallium selenite systems results in three new compounds of MGa(SeO) (M = Sr, Pb) and BiGa(SeO). The isostructural MGa(SeO) (M = Sr, Pb) are centrosymmetric (1̅, no. 2).
View Article and Find Full Text PDFSoft Plasmonic Assemblies Exhibiting Unnaturally High Refractive Index.
Nano Lett
July 2020
KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Republic of Korea.
Article Synopsis
- * Recent progress in monolithic lithography has improved the refractive indices of semiconductors like silicon and germanium, but new methods aim to exceed these limits.
- * The soft self-assembly of polyhedral gold colloids shows potential for achieving high refractive index values (6.4 at near-infrared) and creates opportunities for developing innovative optical metamaterials.
Gallium Arsenate Dihydrate under Pressure: Elastic Properties, Compression Mechanism, and Hydrogen Bonding.
Inorg Chem
August 2015
†Department of Geosciences and ‡Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, United States.
Gallium arsenate dihydrate is a member of a class of isostructural compounds, with the general formula M(3+)AsO4·2H2O (M(3+) = Fe, Al, In, or Ga), which are being considered as potential solid-state storage media for the sequestration of toxic arsenic cations. We report the first high-pressure structural analysis of a metal arsenate dihydrate, namely, GaAsO4·2H2O. This compound crystallizes in the orthorhombic space group Pbca with Z = 8.
View Article and Find Full Text PDFGallium fluoroarsenates.
Dalton Trans
July 2015
Department of Chemistry, University of Bath, Bath BA2 7AY, UK.
Six new phases in the gallium-fluoride-arsenate system have been synthesised hydrofluorothermally using a fluoride-rich medium and "HAsF6" (HF : AsF5) as a reactant. RbGaF3(H2AsO4), KGaF(H2AsO4) and [piperazine-H2]2[Ga2F8(HAsO4)]·H2O have one dimensional structures, [DABCO-H2]2[Ga4F7O2H(AsO4)2]·4H2O consists of two dimensionally connected polyhedral layers, while GaF(AsO3[OH,F])2 and (NH4)3Ga4F9(AsO4)2 both have three-dimensionally connected polyhedral frameworks.
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