Characterization of thin back-to-back CdTe detectors with various sizes

Thin CdTe detectors (3 mm×5 mm electrode area, 0.5 and 0.8 mm thick), mounted in back-to-back configuration with common anode, have been characterized. This configuration allows one to double the useful absorbing thickness in the classical planar parallel field (PPF) irradiation geometry, and to double the sensitive areas in the planar transverse field (PTF) geometry, while maintaining the same inter-electrode distances (0.5 or 0.8 mm) and one electronic chain, as for single detectors. The tests performed aim at understanding the effects on the spectroscopic performance of various interelectrode distances and in particular of the chemical and mechanical treatments used to reduce the detector thickness to the desired values