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Proceedings Paper

Photoemission from nano-structured a-C/diamond layers irradiated by intense Nd:YAG laser harmonics
Author(s): V. Sessa; S. Orlanducci; A. Fiori; M. L. Terranova; F. Tazzioli; C. Vicario; I. Boscolo; S. Cialdi; M. Rossi
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Paper Abstract

We investigated the influence of the surface state of diamond layers on the characteristics of the photoemission induced by 4.7 eV photons. A series of diamond samples grown by CVD under slightly different conditions have been analysed. Polycrystalline diamond layers with nanoscale graphitic patches embedded at the grain boundaries are found to exhibit unusually high efficiency of electron photoemission. The photoemitting properties of the different samples are rationalized by considering the electron emission process located at the a-C/diamond/vacuum triple border and the quantum efficiency (Q.E). governed by the ratio of amorphous sp2-C to crystalline sp3-C. At 4.7 eV values of quantum efficiency up to 1.5 x 10-5 have been measured and the trends of the experimental Q vs J curves indicate that photoemission occurred mainly under one-photon regimes.

Paper Details

Date Published: 28 June 2005
PDF: 8 pages
Proc. SPIE 5838, Nanotechnology II, (28 June 2005); doi: 10.1117/12.609584
Show Author Affiliations
V. Sessa, Univ. Tor Vergata of Rome (Italy)
S. Orlanducci, Univ. Tor Vergata of Rome (Italy)
A. Fiori, Univ. Tor Vergata of Rome (Italy)
M. L. Terranova, Univ. Tor Vergata of Rome (Italy)
F. Tazzioli, National Institute of Nuclear Physics (Italy)
C. Vicario, National Institute of Nuclear Physics (Italy)
I. Boscolo, Univ. of Milan (Italy)
S. Cialdi, Univ. of Milan (Italy)
M. Rossi, Univ. La Sapienza of Rome (Italy)


Published in SPIE Proceedings Vol. 5838:
Nanotechnology II
Paolo Lugli; Laszlo B. Kish; Javier Mateos, Editor(s)

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