David B Geohegan Group Leader, Functional Hybrid Nanomaterials, Center for Nanophase Materials Sciences Contact geohegandb@ornl.gov | 865.241.6159 All Publications Isoelectronic tungsten doping in monolayer MoSe2 for carrier type modulation ... Low Temperature Synthesis of Hierarchical TiO2 Nanostructures for High Performance Perovskite Solar Cells... In-plane Optical Anisotropy of Layered Gallium Telluride... Tailoring Vacancies Far Beyond Intrinsic Levels Changes the Carrier Type in Monolayer MoSe2-x CrystalsVacancy induced anomali... Interlayer Interactions in Twisted WSe2/WS2 Bilayer Heterojunctions: Synthesis, Characterization, and Modeling... Nanoscale Silicon as a Catalyst for Graphene Growth: Mechanistic Insight from in Situ Raman Spectroscopy... Low Thermal Budget, Photonic-Cured Compact TiO2 Layer for High-Efficiency Perovskite Solar Cells... Two-dimensional GaSe/MoSe2 Misfit Bilayer Heterojunctions by van der Waals Epitaxy... Persistent photoconductivity in two-dimensional Mo1-xWxSe2−MoSe2 van der Waals heterojunctions... Deciphering Halogen Competition in Organometallic Halide Perovskite Growth... Improving Light Harvesting in Dye-Sensitized Solar Cells Using Hybrid Bimetallic Nanostructures... Anisotropic Electron-Photon and Electron-Phonon Interactions in Black Phosphorus... Twisted MoSe2 Bilayers with Variable Local Stacking and Interlayer Coupling Revealed by Low-Frequency Raman Spectroscopy Two-dimensional Ga/Se/MoSe2 misfit bilayer heterojunctions by van der Waals epitaxy Twisted MoSe2 bilayers with variable stacking and interlayer coupling revealed by low-frequency Raman spectroscopy... Improving Light Harvesting in Dye Sensitized Solar Cells using Hybrid Bimetallic Nanostructures... Deciphering Halogen Competition in Organometallic Halide Perovskite Growth Tailoring synthesis of high-vacancy MoSe<sub>2-x</sub> monolayer crystals Two-dimensional GaSe/MoSe2 misfit bilayer heterojunctions by van der Waals epitaxy Ultrathin Nanosheets of CrSiTe3: A Semiconducting Two-Dimensional Ferromagnetic Material ... Low-Frequency Interlayer Raman Modes to Probe Interface of Twisted Bilayer MoS2... Carbon Nanotubes Grown on Metal Microelectrodes for the Detection of Dopamine... Nanophase Engineering of Organic Semiconductor-based Solar Cells ... Controllable Growth of Perovskite Films by Room-Temperature-Air-Exposure for Efficient Planar Heterojunction Photovoltaic Cel... Nonlinear Fano-Resonant Dielectric Metasurfaces... Pagination First page « First Previous page ‹‹ … Page 3 Current page 4 Page 5 … Next page ›› Last page Last » Key Links Curriculum Vitae Google Scholar ORCID Organizations Physical Sciences Directorate User Facilities Center for Nanophase Materials Sciences Nanomaterials Synthesis Section Functional Hybrid Nanomaterials Group