Special Article – New Tools and Techniques
New method for the production of thin and stable, segmented n contacts in HPGe detectors
Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, Viale dell’Università 2, 35020, Legnaro, PD, Italy
2 Facultat de Fisica, Universitat de Valencia, C/ Doctor Moliner 50, 46100, Burjassot, Spain
3 Instituto de Física Corpuscular, C/Catedrático José Beltrán 2, 46980, Paterna, Spain
4 Dipartimento di Fisica e Astronomia “G. Galilei”, Università di Padova, Via Marzolo 8, 35121, Padua, PD, Italy
5 INFN, Sezione di Perugia & Dipartimento di Fisica e Geologia, Università di Perugia, Via A. Pascoli, 06123, Perugia, Italy
6 INFN Sezione di Ferrara, Via Saragat 1, 44124, Ferrara, Italy
Accepted: 11 May 2021
Published online: 2 June 2021
The realization of pulsed-laser diffused, thin n contacts on high purity germanium (HPGe) and their successful segmentation is described. The contacts have been obtained by a laser-induced diffusion of Sb atoms, deposited by sputtering on Ge surface, and then segmented by means of a photolithographic technique. Three small prototypes of gamma ray detectors have been implemented, using the same n contact (laser diffused Sb) but with three different geometries and a B implanted p contact. Electrical and detection properties of the prototypes have been characterized, showing low leakage currents and good spectroscopy data with different gamma-ray sources. The stability of the detector performance has also been tested subjecting one of the prototypes to a typical annealing treatment.
© The Author(s) 2021
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