Del Sordo, Stefano and Agnetta, Gaetano and Biondo, B. and Caroli, Ezio and Celi, Filippo and Donati, Ariano and Giarrusso, Salvatore and Mangano, A. and Montanti, R. and Russo, Francesco and Schiavone, Filomena and Stephen, John B. and Strazzeri, M. and Ventura, Giulio and Pareschi, Giovanni and Abbene, Leonardo and Fauci, Francesco and Raso, Giuseppe and Radicci, V. and Tangaro, Sonia and Oliva, Piernicola and Stumbo, Simone (2004) Measurements of spectral and position resolution on a 16x16 pixel CZT imaging hard x-ray detector. In: X-Ray and Gamma-Ray Instrumentation for Astronomy XIII, 3 August 2003, San Diego (CA), USA. Bellingham, SPIE. p. 63-72. (Proceedings of SPIE, 5165). ISSN 0277-786X. Conference or Workshop Item.
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Cadmium zinc telluride (CZT) pixel detectors show very good spectral and spatial resolution and are suitable for use in compact hard X-ray sensors operated without cryogenics. One of the more interesting astrophysical application is their use as focal plane detectors for multilayer hard X-ray telescopes operating in the 15-70 keV energy band. Here we report on results obtained using a 16 x 16 CZT pixel detector (10 x 10 x 1 mm3 single crystal) with 500 µm pixels operated at room temperature using standard commercial electronics. The results clearly show that the use of small pixels is effective in reducing one of the major drawbacks of CZT planar detectors i.e. the considerable amount of charge loss, due to hole trapping, which gives rise to a reduced energy resolution and a low energy tail in the pulse-height spectra.
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