Contributo in atti di convegno, 2012, ENG

Polycrystalline diamond films grown by MWPECVD technique and application in photocathodes

G. Cicala a, M. A. Nitti b, A. Tinti c, A. Valentini c, A. Romeo b, R. Brescia d, P. Spinelli c, M. Capitelli d.

a IMIP-CNR, Sezione di Bari - Via G. Amendola 122/D, 70126 Bari, Italy; b Dipartimento Interateneo di Fisica, Università degli Studi di Bari - Via G. Amendola 173, 70126 Bari, Italy; c INFN, Sezione di Bari - Via G. Amendola 173, 70126 Bari, Italy; d Dipartimento di Chimica, Università degli Studi di Bari - Via G. Amendola 173, 70126 Bari, Italy.

Diamond is an extremely interesting material for photoemission applications, due to the negative electron affinity which can be obtained after suitable surface treatments. In the present work, two sets of polycrystalline diamond films, characterized by dif-ferent thickness and deposition conditions, are ana-lyzed. In particular, the relationship among the grain size, the amount of non-diamond carbon (sp2) located at the grain boundaries and the film sensitivity as a photocathode has been found and carefully investi-gated. The photoemission yield in the UV range has been evaluated for all the samples, before and after hydrogenation process, and after air exposure. The critical parameter for the photocathode performances has been found not to be the film thickness, but the properties of polycrystalline diamond films, tunable with the plasma modulation and the methane percent-age in the gas mixture.

II° Workshop Plasmi Sorgenti Biofisica ed Applicazioni, pp. 75–81, Lecce, 26 Ottobre 2010

Keywords

CNR authors

Cicala Grazia

CNR institutes

NANOTEC – Istituto di Nanotecnologia

ID: 192057

Year: 2012

Type: Contributo in atti di convegno

Creation: 2012-11-23 19:12:06.000

Last update: 2012-11-23 19:12:06.000

CNR authors

External links

OAI-PMH: Dublin Core

OAI-PMH: Mods

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External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:192057