  CMOS sensors were successfully implemented in the STAR tracker [1]. LHC
experiments have shown that efficient b tagging, reconstruction of displaced
vertices and identification of disappearing tracks are necessary. An improved
vertex detector is justified for the ILC. To achieve a point(spatial single
layer) resolution below the one-{\mu}m range while improving other
characteristics (radiation tolerance and eventually time resolution) we will
need the use of 1-micron pitch pixels. Therefore, we propose a single MOS
transistor that acts as an amplifying device and a detector with a buried
charge-collecting gate. Device simulations both classical and quantum, have led
to the proposed DoTPiX structure. With the evolution of silicon processes, well
below 100 nm line feature, this pixel should be feasible. We will present this
pixel detector and the present status of its development in both our
institution (IRFU) and in other collaborating labs (CNRS/C2N).
