Size effect of nanometer vacuum gap thermionic power conversion device with CsI coated graphite electrodes

Jeong Ik Lee; Yong Hoon Jeong; Hee-Cheon No; Hannebauer, Rob; Sang-Keun Yoo
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p223107
Academic Journal
Cesium iodide (CsI) coated graphite is a good candidate for an electrode material of a thermionic power generation device due to its low work function. In this letter, a thermionic device with a nanometer-scale vacuum gap between a CsI coated graphite emitter and a collector will be investigated while considering various gap-size effects. It is shown that a nanometer scale gap-size not only affects electron transport but also photon transport, and that all of these effects must be taken into account when estimating the device’s performance.


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