Evaluation of Indium Diffused M-i-n CdZnTe Detectors

Abstract

One of the main electronic noise sources of a room temperature spectroscopy system is the leakage current of a detector. It can be reduced with a pn-junction type detector structure such as a M-i-n configuration, and with cooling. In this work eight CdZnTe detectors with a M-i-n structure were fabricated by indium diffusion. The junction was characterized by a currentvoltage technique. Detector electrical, charge collection and spectroscopic properties were compared to the ones received with the traditional electroless Au contacts, before the junction formation. As a result of the indium diffusion an improved detector leakage current performance was achieved. However, a corresponding improvement in the detector energy resolution was not always observed due to the CdZnTe charge collection properties and process variables.

Performance of the ALICE Zero Degree Calorimeters in Pb-Pb collisions at LHC

“…The vdM scan results are still preliminary, in particular the systematic error estimate (as described in ref. [5]). The main contributions to the systematic errors are: ±5% from systematic uncertain ties associated with the ALICE measurement, ±3% from beam current measurement, and -0%+ II % from the ghost (outside the nominal buckets) charge fraction evaluation.…”

Development of compound semiconductor detectors for x- and gamma-ray spectroscopy

“…Our detector research program has centered on compound semiconductors, including, GaAs, InP, CdZnTe, HgI 2 and TlBr. Results have been reported elsewhere [1][2][3][4][5][6][7][8][9][10][11]. Although a significant fraction of this program is spent on the production of arrays, in this paper we will concentrate on monolithic detectors, since their responses are more intimately related to basic material properties, rather than fabrication or operating techniques (for example, using near field effects to improve energy resolution in materials with poor transport properties of one carrier).…”