David Geohegan Facility User, Center for Nanophase Materials Sciences Contact GEOHEGANDB@ORNL.GOV All Publications 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... Observation of two distinct negative trions in tungsten disulfide monolayers... Structure and Formation Mechanism of Black TiO2 Nanoparticles... Phase determination of black TiO2 nanoparticles... Correlating High Power Conversion Efficiency of PTB7:PC71BM Inverted Organic Solar Cells to Nanoscale Structure Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk ... Van der Waals Epitaxial Growth of Single-Crystal Two-Dimensional GaSe on Graphene ... Nonlinear Conversion Using Fano-Resonant All-Dielectric Metasurfaces Patterned Arrays of Lateral Heterojunctions within Monolayer 2D Semiconductors... Low-frequency Interlayer Breathing Modes in Few-layer Black Phosphorus Low-frequency Raman 'fingerprints' of two-dimensional metal dichalcogenide layer stacking configurations... High-Performance Flexible Perovskite Solar Cells by Using a Combination of Ultrasonic Spray-Coating and Low Thermal Budget Photonic Curing Revealing the Preferred Interlayer Orientations and Stackings of Two-Dimensional Bilayer Gallium Selenide Crystals Equally Efficient Inter layer Exciton Relaxation and Improved Absorption in Epitaxial and Nonepitaxial MoS2/WS2 Heterostructures Patterned arrays of lateral heterojunctions within monolayer two-dimensional semiconductors Observation of two distinct negative trions in tungsten disulfide monolayers Efficient Interlayer Relaxation and Transition of Excitons in Epitaxial and Non-epitaxial MoS2/WS2 Heterostructures Slowing of Femtosecond Laser-Generated Nanoparticles in a Background Gas Revealing the surface and bulk regimes of isothermal graphene growth on Ni with in situ kinetic measurements and modeling Understanding how processing additives tune nanoscale morphology of high efficiency organic photovoltaic blends: From casting solution to spun-cast thin film Digital Transfer Growth of Patterned 2D Metal Chalcogenides by Confined Nanoparticle Evaporation... Pulsed Laser Deposition of Photoresponsive Two-Dimensional GaSe Nanosheet Networks Controlled Vapor Phase Growth of Single Crystalline, Two-Dimensional GaSe Crystals with High Photoresponse ... Pagination First page « First Previous page ‹‹ … Page 4 Current page 5 Page 6 … Next page ›› Last page Last » Key Links Curriculum Vitae Google Scholar ORCID Organizations Physical Sciences Directorate User Facilities Center for Nanophase Materials Sciences
