Thermionic Electron Emission from Ultrananocrystalline Diamond Films

Sankaran KJ , Pramila Sakthivel, Ranjita Mohanty,

Published on: 2020-08-31


In this work, we synthesized CH4/Ar-based ultrananocrystalline diamond (UNCD) films by using a microwave plasma enhanced chemical vapor deposition method. These films exhibit improved thermionic electron emission (TEE) properties with a work function value of 4.8 eV and a high current density of 0.47 mA/cm2. The high field enhancement factor and the amorphous carbon phases at the grain boundaries of UNCD films are the reliable features for the improved TEE characteristics of UNCD films. The results encourage the potential use of UNCD films for efficient thermionic electronic emission devices.

scroll up