207 citations · 576 across the 12 of their papers we have counts for
12 papers
Time-dependence of SrVO thermionic electron emission properties
Md Sariful Sheikh, Ryan Jacobs, Dane Morgan +1
Thermionic electron emission cathodes are critical components of various high power and high frequency vacuum electronic devices, electron microscopes, e-beam lithographic devices,…
Physical factors governing the shape of the Miram curve knee in thermionic emission
Dongzheng Chen, Ryan Jacobs, Dane Morgan +1
In a current density versus temperature (J-T) (Miram) curve in thermionic electron emission, experimental measurements demonstrate there is a smooth transition between the exponent…
Physics-based Model for Nonuniform Thermionic Electron Emission from Polycrystalline Cathodes
Dongzheng Chen, Ryan Jacobs, John Petillo +4
Experimental observations of thermionic electron emission demonstrate a smooth transition between TL and FSCL regions of the emitted-current-density-versus-temperature (J-T) (Miram…
Discovery and Engineering of Low Work Function Perovskite Materials
Tianyu Ma, Ryan Jacobs, John Booske +1
Materials with low work functions are critical for an array of applications requiring the facile removal or efficient transport of electrons through a device. Perovskite oxides are…
Work Function Trends and New Low Work Function Boride and Nitride Materials for Electron Emission Applications
Tianyu Ma, Ryan Jacobs, John Booske +1
LaB6 has been used as a commercial electron emitter for decades. Despite the large number of studies on the work function of LaB6, there is no comprehensive understanding of work f…
Solid phase epitaxial growth of the correlated-electron transparent conducting oxide SrVO3
Samuel D. Marks, Lin Lin, Peng Zuo +11
SrVO3 thin films with a high figure of merit for applications as transparent conductors were crystallized from amorphous layers using solid phase epitaxy (SPE). Epitaxial SrVO3 fil…
Impact of Nonuniform Thermionic Emission on the Transition Behavior between Temperature- and Space-Charge-Limited Emission
Dongzheng Chen, Ryan Jacobs, Dane Morgan +1
Experimental observations have long-established that there exists a smooth roll-off or knee transition between the temperature-limited (TL) and full-space-charge-limited (FSCL) emi…
Material Discovery and Design Principles for Stable, High Activity Perovskite Cathodes for Solid Oxide Fuel Cells
Ryan Jacobs, Tam Mayeshiba, John Booske +1
Critical to the development of improved solid oxide fuel cell (SOFC) technology are novel compounds with high oxygen reduction reaction (ORR) catalytic activity and robust stabilit…
Work function and surface stability of tungsten-based thermionic electron emission cathodes
Ryan Jacobs, Dane Morgan, John Booske
Materials that exhibit a low work function and therefore easily emit electrons into vacuum form the basis of electronic devices used in applications ranging from satellite communic…
Understanding and controlling the work function of perovskite oxides using Density Functional Theory
Ryan Jacobs, John Booske, Dane Morgan
Perovskite oxides containing transition metals are promising materials in a wide range of electronic and electrochemical applications. However, neither their work function values n…
Electron Emission Energy Barriers and Stability of with Adsorbed Ba and Ba-O
Ryan M. Jacobs, John H. Booske, Dane Morgan
In this study we employ Density Functional Theory (DFT) methods to investigate the surface energy barrier for electron emission (surface barrier) and thermodynamic stability of Ba…
Intrinsic defects and conduction characteristics of in thermionic cathode systems
Ryan M. Jacobs, John H. Booske, Dane Morgan
Recent experimental observations indicate that bulk (~200 nm thick), an insulator at room temperature and pressure, must act as a good electronic conductor during thermio…