Preliminary test results from a single-sided two-dimensional detector using pMOS pixels

As a part of the R&D for the BELLE experiment at the KEK-B-factory a strip-like two-dimensional readout single-sided detector using pMOS pixels has been developed and tested. It may be used in upgrades of the vertex detector. A double drain pMOS transistor, implanted in the 100 × 100 μm2 n-well collecting electrode, amplifies the signal, while the low detector capacitance lowers the noise. A high signal-to-noise ratio is expected. Ganging the pixels at the drain nodes in a strip-like configuration provides a two-dimensional readout. The superior characteristics of the proposed device are attractive for charged particle detection as well as X- and γ-rays. We present here results from electrical and IR light tests of prototypes of the pMOS pixel.