Electron emission from flat Boron-doped diamond under high electric field and pulsed tunable laser illumination
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-07-01 |
| Authors | V. Porshyn, P. Serbun, Dirk LĆ¼tzenkirchenāHecht |
| Institutions | University of Wuppertal |
Abstract
Section titled āAbstractāWe report systematic investigations of the photo- and field induced electron emission from highly doped and highly ordered, flat polycrystalline diamond material by means of photo-field emission spectroscopy. The cathode was operated under pulsed tunable laser illumination (pulse duration tlaser=3.5 ns, photon energy hv=0.5-5.9 eV) in a wide power range of up to 0.7 GW/cm <sup xmlns:mml=āhttp://www.w3.org/1998/Math/MathMLā xmlns:xlink=āhttp://www.w3.org/1999/xlinkā>2</sup> und under electrical fields of up to 20 MV/m. In addition to the general photoemission studies, the local breakdown behaviour of BDD was observed for hv=1.25-5.35 eV, which exhibits a certain voltage- and laser power-threshold. Direct electron spectroscopy was carried out for hv-values well below the band gap energy during the breakdown and at the breakdown thresholds. Hence, a prominent reduction of the work function under certain conditions was detected. Moreover, the spectra hint for phenomena such as explosive electron emission, photon-enhanced thermionic emission and photo-induced field emission.