Semiconductor photodetector and radiation detector system

A semiconductor photodetector, comprising:

• a semiconductor substrate,
• an upper doping zone, which is doped according to a first doping type,
• a lower doping zone, which is doped according to a second doping type,
• a quench resistance area,
• a contacting layer,
• a first additional doping zone, which is doped according to the first doping type,
• and
• a second additional doping zone which is doped according to the second doping type,
• wherein the upper doping zone extends laterally on a surface in the semiconductor substrate, wherein the lower doping zone and the upper doping zone are arranged to form avalanche areas in such manner that the lower doping zone extends laterally opposite the upper doping zone in the semiconductor substrate, wherein the lower doping zone is separated from an adjacent lower doping zone by an intermediate area, wherein the quench resistance area is arranged in the semiconductor substrate between the lower doping zone and the contacting layer, wherein the quench resistance area, when an operating voltage is applied, is formed as a region in the semiconductor substrate which is depleted of charge carriers and which is laterally restricted, wherein the contacting layer is arranged on the rear of the semiconductor substrate, wherein the first additional doping zone is arranged in the semiconductor substrate in the area between the lower doping zone and the contacting layer, extends laterally below the at least one intermediate area and into the area below the lower doping zone and the adjacent lower dopinge, and is discontinuous in the area below the lower doping zone, and wherein the second additional doping zone is arranged in the semiconductor substrate in the area between the lower doping zone and the first additional doping zone, extends laterally below the at least one intermediate area, and forms a potential barrier between the upper doping zone and the first additional doping zone, wherein, with reference to an upper side of the semiconductor substrate, the first additional doping zone is arranged deeper in the semiconductor substrate than the second additional doping zone.