Photoemission from nano-structured a-C/diamond layers irradiated by intense Nd:YAG laser harmonics

V. Sessa; S. Orlanducci; A. Fiori; M. L. Terranova; F. Tazzioli; C. Vicario; I. Boscolo; S. Cialdi; M. Rossi

doi:10.1117/12.609584

28 June 2005 Photoemission from nano-structured a-C/diamond layers irradiated by intense Nd:YAG laser harmonics

V. Sessa, S. Orlanducci, A. Fiori, M. L. Terranova, F. Tazzioli, C. Vicario, I. Boscolo, S. Cialdi, M. Rossi

Proceedings Volume 5838, Nanotechnology II; (2005) https://doi.org/10.1117/12.609584
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

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.

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V. Sessa, S. Orlanducci, A. Fiori, M. L. Terranova, F. Tazzioli, C. Vicario, I. Boscolo, S. Cialdi, and M. Rossi "Photoemission from nano-structured a-C/diamond layers irradiated by intense Nd:YAG laser harmonics", Proc. SPIE 5838, Nanotechnology II, (28 June 2005); https://doi.org/10.1117/12.609584

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