Performance of a large area Si PIN photodiode array

We have developed a 10 cm-square large-area Si PIN photodiode array (PDA) for a readout of a pixellated scintillator array. The 10 cm-square PDA consists of four 5 cm-square PDAs, each of which has 100 pixels with a pitch of 5 mm, and is aligned with no dead-space with each other. The structure of the PDA is based on the Hamamatsu S3590-08, which is a conventional Si PIN photodiode with an area of 1 cm-square. The cathode electrode is common, and anodes are read individually. We report the basic performance of the PDA; the quantum efficiency, leakage current, and detector capacitance. We measured X-ray spectra with radioisotopes, and evaluated the position dependence of the energy resolution. Coupling to the small CsI(Tl) scintillator bar, the gamma-ray spectrum was also measured, and the sufficient performance for a readout of CsI(Tl) scintillator was confirmed. The design and performance of the large-area PDA are reported