Patent ID: 7105827

Claim:
A semiconductor detector for detecting electromagnetic radiation or particle radiation, comprising: a semiconductor body of a first conduction type, comprising first and second main surfaces; a group of drift electrodes comprising a second, opposite conduction type and being arranged on the first main surface for generating at least one drift field in the semiconductor body; and a counterelectrode arrangement arranged on the second main surface forming a radiation entry window, the counterelectrode arrangement comprising a two-dimensional unstructured main electrode and at least one barrier electrode which are electrically insulated from each other, wherein the at least one barrier electrode is connected to a voltage source and is arranged such that a blocking voltage can be applied to it relative to the semiconductor body, with said blocking voltage exceeding a blocking voltage of the main electrode, and wherein the at least one barrier electrode lies in the plane of the second main surface opposite to the outermost of the drift electrodes and entirely or partially encloses the main electrode.