Scientific Results

Electrical and Raman-imaging characterization of laser-made electrodes for 3D diamond detectors

Year: 2014

Authors: Lagomarsino S., Bellini M., Corsi C., Fanetti S., Gorelli F., Liontos I., Parrini G., Santoro M., Sciortino S.

Autors Affiliation: National Institute of Nuclear Physics (INFN), Via B. Rossi 1–3, 50019 Sesto Fiorentino (FI), Italy; Department of Physics and Astronomy, University of Florence, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy; European Laboratory for Non-Linear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy; Istituto Nazionale di Ottica (INO-CNR), Largo Enrico Fermi 6, 50125 Firenze (FI), Italy; Center for Plasma Physics and Lasers (CPPL), 1 E. Daskalaki Str., 74100 Rethymno (Crete), Greece

Abstract: Pulsed laser writing of graphitic electrodes in diamond is a promising technique for innovative particle detectors. Although of great relevance in 3D fabrication, the processes involved in sub-bandgap bulk irradiation are still not well understood. In this work, Raman imaging is exploited to correlate resistivity and graphitic content in 5-10 pm-thick electrodes, obtained both in the domains of femtoseconds and of nanoseconds of pulse duration. A wide interval of resistivities (60-900 m Omega cm), according to the irradiation technique employed, are correlated with an sp(2) content of the modified material ranging over a factor 2.5. The stress distribution (maximum of about 10 GPa) and the presence of nanostructured sp(3) material around the graphitic columns have also been studied by Raman spectroscopy, and a rationale for the conductive behavior of the material is presented in terms of the thermodynamics of the process. (C) 2014 Elsevier B.V. All rights reserved.

Journal/Review: DIAMOND AND RELATED MATERIALS

Volume: 43      Pages from: 23  to: 28

More Information: 228334 LASERLABEUROPE. FP7 G.A.No. Illinois Institute of Technology, IIT. Instituto Nazionale di Fisica Nucleare, INFN. Ente Cassa di Risparmio di Firenze. 2011-10-01. European Geosciences Union, EGU. Alfred P. Sloan Foundation. – We are grateful to Andrea Giugni and Gobind Das, (IIT Genova, Italy) for performing some of the Raman measurements in Fig. 2 . We are also grateful to Mauro Pucci (INO-Florence, Italy) for his work in optical and mechanical processing of diamond samples and to Mirko Brianzi (INFN-Florence, Italy) for his help in the electrical measurements. We acknowledge the support from the European Union (LENS Contract FP7 G.A.No. 228334 LASERLABEUROPE), the Ente Cassa di Risparmio di Firenze , and the Deep Carbon Observatory initiative (Grant No. 2011-10-01 from the Alfred P. Sloan Foundation for the project entitled ‘Physics and Chemistry of Deep Carbon Bearing Fluids and Mineral’). This work was accomplished in the framework of the INFN experiment CHIPSODIA.
KeyWords: 3-D detectors; Conductive behavior; Diamond detectors; Diamond graphitization; Graphitic content; Modified materials; Pulse durations; Raman imaging, Diamonds; Electrodes; Irradiation; Stress concentration; Thermodynamics, Three dimensional
DOI: 10.1016/j.diamond.2014.01.002

Citations: 34
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