Figure 1
Cut view of a 10 mm2 circular SDD. In the central part (collection region), the drift field is finely tuned in order to collect electrons towards the readout anode. In this particular case the readout anode is rather large to allow it to be glued directly to the readout J.FET. In the drift region, the back consists of segmented P+ electrodes raised to different potentials. The outer part is the guard region. The front is a single P+ electrode. In the case of SDDs with a larger active area, the front electrode is segmented into two parts raised to increasing potentials. |