D
David B. Geohegan
Researcher at Oak Ridge National Laboratory
Publications - 354
Citations - 19124
David B. Geohegan is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Carbon nanotube & Laser. The author has an hindex of 71, co-authored 345 publications receiving 16422 citations. Previous affiliations of David B. Geohegan include Battelle Memorial Institute & University of Illinois at Urbana–Champaign.
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Journal ArticleDOI
Highly Responsive Ultrathin GaS Nanosheet Photodetectors on Rigid and Flexible Substrates
PingAn Hu,Lifeng Wang,Mina Yoon,Jia Zhang,Wei Feng,Xiaona Wang,Zhenzhong Wen,Juan Carlos Idrobo,Yoshiyuki Miyamoto,David B. Geohegan,Kai Xiao +10 more
TL;DR: Theoretical modeling of the electronic structures indicates that the reduction of the effective mass at the valence band maximum (VBM) with decreasing sheet thickness enhances the carrier mobility of the GaS nanosheets, contributing to the high photocurrents.
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Synthesis of Novel Thin-Film Materials by Pulsed Laser Deposition
Douglas H. Lowndes,David B. Geohegan,Alexander A. Puretzky,David P. Norton,Christopher M. Rouleau +4 more
TL;DR: Cluster-assembled nanocrystalline and composite films offer opportunities to control and produce new combinations of properties with PLD, and artificially layered materials and metastable phases have been created and their properties varied by control of the layer thicknesses.
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Nonlinear Fano-Resonant Dielectric Metasurfaces.
Yuanmu Yang,Wenyi Wang,Abdelaziz Boulesbaa,Ivan I. Kravchenko,Dayrl P. Briggs,Alexander A. Puretzky,David B. Geohegan,Jason Valentine +7 more
TL;DR: The Fano-resonant silicon metasurface results in strong near-field enhancement within the volume of the silicon resonator while minimizing two photon absorption and results in transmission modulation with a modulation depth of 36%.
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PdSe2: Pentagonal Two-Dimensional Layers with High Air Stability for Electronics.
Akinola D. Oyedele,Shize Yang,Liangbo Liang,Alexander A. Puretzky,Kai Wang,Jingjie Zhang,Jingjie Zhang,Peng Yu,Pushpa Raj Pudasaini,Avik W. Ghosh,Zheng Liu,Christopher M. Rouleau,Bobby G. Sumpter,Matthew F. Chisholm,Wu Zhou,Philip D. Rack,Philip D. Rack,David B. Geohegan,Kai Xiao,Kai Xiao +19 more
TL;DR: Field-effect transistors made from the few-layer PdSe2 display tunable ambipolar charge carrier conduction with a high electron field-effect mobility of ∼158 cm2 V-1 s-1, indicating the promise of this anisotropic, air-stable, pentagonal 2D material for 2D electronics.
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Calcium as the superior coating metal in functionalization of carbon fullerenes for high-capacity hydrogen storage.
Mina Yoon,Mina Yoon,Shenyuan Yang,Shenyuan Yang,Christian Hicke,Enge Wang,David B. Geohegan,Zhenyu Zhang,Zhenyu Zhang +8 more
TL;DR: First-principles density functional theory studies show that both Ca and Sr can bind strongly to the C60 surface, and highly prefer monolayer coating, thereby explaining existing experimental observations.