Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4767349
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- Global Climate and Energy Project (GCEP) at Stanford University
- Japan Society for Promotion of Science (JSPS)/the Japan Ministry of Education, Culture, Sports, Science and Technology (MEXT)
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Photon-enhanced thermionic emission from semiconducting cathodes is a promising means of increasing cathode current density in low temperature vacuum thermionic energy devices [J. W. Schwede et al., Nature Mater. 9, 762 (2010)]. However, the space charge resulting from high emission current densities prevents emitted electrons from reaching the collector, even with gaps as small as 100 mu m and at voltages as high as 1 V. We demonstrate by particle-in-cell simulations that one possible solution to overcoming the space charge is to add cesium filling and generation of a space charge-neutralizing plasma by continuous laser excitation of the cesium resonance level. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4767349]
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