Solid state photomultiplier having an intermediate region coupled between high and low voltage regions and associated detector

A detector for an imaging system, comprising:

• a detector assembly having a plurality of solid state photomultipliers coupled to readout electronics, wherein each of the solid state photomultipliers comprises:
• an epitaxial layer;
• a high voltage region formed in the epitaxial layer and comprising an avalanche photodiode;
• a low voltage region formed in the epitaxial layer and comprising at least one of quenching or resetting circuits;
• an intermediate region disposed between the high voltage region and low voltage region, wherein the high voltage region is electrically coupled to the low voltage region via the intermediate region, and wherein at least a portion of the epitaxial layer is disposed between the high voltage region and intermediate region and between the low voltage region and the intermediate region.;
• wherein the at least one of quenching or resetting circuits comprises transistors;
• and
• wherein the transistors are not high voltage transistors.