# The unit of integrated charge in charge monitor

Hi, i am wondering what is the unit for the charge calculated in charge monitor in device ? For example, for a 2D modulator simulation, we can get the integrated charge in some area, the question is which unit for the calculated charge, C/m ?

Dear @yanfei.bai,

As mentioned in this article, the charge monitor records the electron and hole densities which will be in units of 1/cm^3. The integrate total charge option, calculates the total number of electrons and holes which will be unitless in 3D, and in units of 1/m in a 2D simulation.

Kind regards

Thanks a lot !