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Internal Electric-Field-Lines Distribution in CdZnTe Detectors Measured Using X-Ray Mapping

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7 Author(s)
Bolotnikov, A.E. ; Brookhaven Nat. Lab., Upton, NY ; Camarda, G.S. ; Cui, Y. ; Hossain, A.
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The ideal operation of CdZnTe devices entails having a uniformly distributed internal electric field. Such uniformity especially is critical for thick long-drift-length detectors, such as large-volume CPG and 3-D multi-pixel devices. Using a high-spatial resolution X-ray mapping technique, we investigated the distribution of the electric field in real devices. Our measurements demonstrate that in thin detectors, < 5 mm, the electric field-lines tend to bend away from the side surfaces (i.e., a focusing effect). In thick detectors, > 1 cm, with a large aspect ratio (thickness-to-width ratio), we observed two effects: the electric field lines bending away from or towards the side surfaces, which we called, respectively, the focusing field-line distribution and the defocusing field-line distribution. In addition to these large-scale variations, the field-line distributions were locally perturbed by the presence of extended defects and residual strains existing inside the crystals. We present our data clearly demonstrating the non-uniformity of the internal electric field.

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Nuclear Science, IEEE Transactions on  (Volume:56 ,  Issue: 3 )