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Photomultipliers (PMTs) are currently adopted for the photodetector plane ofImaging Atmospheric Cherenkov Telescopes (IACTs). Even though PMT quantumefficiency has improved impressively in the recent years, one of the mainlimitation for their application in the gamma-astronomy field - theimpossibility to operate with moon light - still remains. As a matter of fact,the light excess would lead to significant and faster camera ageing. Solidstate detectors, in particular Geiger-mode avalanche photo-diodes (G-APDs)represent a valuable alternative solution to overcome this limitation asdemonstrated in the field by the FACT experiment (The First G- APD CherenkovTelescope). They can be regarded as a more promising long term approach, whichcan be easily adopted for the new generation of cameras and for the CherenkovTelescope Array (CTA). We describe here the Photo-Detector Plane (PDP) of thecamera for the 4 m Davies Cotton CTA Small Size Telescopes, for which largearea G-APD coupled to non-imaging light concentrators are planned. The PDPincludes 1296 photosensors, the biasing and pre-amplification stages, thecontrol electronics as well as the mechanical support and the water- tightenclosure. We developed with Hamamatsu a new large area hexagonal shaped G-APDwith an area of 93.6 mm^2. This G-APD is divided into 4 channels which will besummed after the pre-amplification stage to maintain an acceptable timecharacteristic of the signal. The characterization of this device for 50 um and100 um micro-cell sizes will be discussed and compared to other non-customphotodetectors.

The Photodetector Plane of the 4m Davies Cotton Small Size Telescope for the Cherenkov Telescope Array