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.
Sessa, V., Orlanducci, S., Fiori, A., TERRANOVA PERSICHELLI, M.l., Cialdi, S., Rossi, M. (2005). Photoemission from nano-structured a-C/diamond layers irradiated by intense Nd:YAG laser harmonics. In L.K. P.Lugli (a cura di), Nanotechnology II (pp. 216-223). Bellingham : SPIE [10.1117/12.609584].
Photoemission from nano-structured a-C/diamond layers irradiated by intense Nd:YAG laser harmonics
SESSA, VITO;ORLANDUCCI, SILVIA;TERRANOVA PERSICHELLI, MARIA LETIZIA;
2005-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
