Characterisation of Photocathodes Based on Pb Thin Film Deposited by UV Pulsed Laser Ablation  

作　　者：Francisco Gontad Antonella Lorusso Giancarlo Gatti Massimo Ferrario Laura Gioia Passione Luana Persano Nicola Lovergine Alessio Perrone 

机构地区：[1]Istituto Nazionale di Fisica Nucleare e Università del Salento [2]Università del Salento,Dipartimento di Matematica e Fisica "E.De Giorgi" [3]Laboratori Nazionali di Frascati,Istituto Nazionale di Fisica Nucleare [4]Center for Biomolecular Nanotechnologies,Istituto Italiano di Tecnologia [5]Dipartimento di Ingegneria dell'Innovazione,Università del Salento [6]National Nanotechnology Laboratory(NNL)

出　　处：《Journal of Materials Science & Technology》2014年第1期37-40,共4页材料科学技术（英文版）

基　　金：supported by the Italian National Institute of Nuclear Physics(INFN)

摘　　要：This work deals with the deposition of lead （Pb） thin films by the UV pulsed laser ablation technique, for their further use as photocathode devices in superconducting radio frequency guns. Scanning electron microscopy and atomic force microscopy analyses were performed to study the morphological features of Pb thin films deposited on Si （100） and Nb substrates. The films showed a granular structure with a nearly fully covered surface only for that one deposited on Nb substrate. X-ray diffraction measurements indicate the growth of polycrystalline Pb thin films with a preferential orientation along （111） planes. Results of the photoemission performance of Pb thin film deposited on Nb substrate showed a very encouraging average value of quantum efficiency of 6 x 10-5 through a single-photon absorption process, promoting further studies in the realisation of Pb photocathodes by this technique.This work deals with the deposition of lead （Pb） thin films by the UV pulsed laser ablation technique, for their further use as photocathode devices in superconducting radio frequency guns. Scanning electron microscopy and atomic force microscopy analyses were performed to study the morphological features of Pb thin films deposited on Si （100） and Nb substrates. The films showed a granular structure with a nearly fully covered surface only for that one deposited on Nb substrate. X-ray diffraction measurements indicate the growth of polycrystalline Pb thin films with a preferential orientation along （111） planes. Results of the photoemission performance of Pb thin film deposited on Nb substrate showed a very encouraging average value of quantum efficiency of 6 x 10-5 through a single-photon absorption process, promoting further studies in the realisation of Pb photocathodes by this technique.

关 键 词：Pulsed laser deposition Lead thin film Metallic photocathodes Quantum efficiency 

分 类 号：TN29[电子电信—物理电子学]