Characterization of the first prototype CMOS pixel sensor developed for the CEPC vertex detector

Purpose CMOS pixel sensor has become extremely attractive for future high-performance tracking devices. It has been proposed for the vertex detector at the Circular Electron Positron Collider, which will allow precision measurements of the properties of the Higgs boson. To meet the stringent requirements for low power consumption, it is necessary to optimize the pixel sensor diode geometry to reach a high charge-over-capacitance ratio that allows reduction in analog power consumption.