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Pulsed laser diffusion of thin hole-barrier contacts in high purity germanium for gamma radiation detectors


A new method for the formation of hole-barrier contacts in high purity germanium (HPGe) is described, which consists in the sputter deposition of a Sb film on HPGe, followed by Sb diffusion produced through laser annealing of the Ge surface in the melting regime. This process gives rise to a very thin (\( \le 100\) nm) n-doped layer, as determined by SIMS measurement, while preserving the defect-free morphology of HPGe surface. A small prototype of gamma ray detector with a Sb laser-diffused contact was produced and characterized, showing low leakage currents and good spectroscopy data with different gamma ray sources.

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Correspondence to G. Maggioni.

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Communicated by C. Broggini

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Maggioni, G., Carturan, S., Raniero, W. et al. Pulsed laser diffusion of thin hole-barrier contacts in high purity germanium for gamma radiation detectors. Eur. Phys. J. A 54, 34 (2018).

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