Patent ID: 8415620

Claim:
A method for determining a doping type and level of a device, the method comprising: generating light from a laser source; directing the light on the device via an extended microscope; collecting electrons photo-emitted from the device in an electron analyzer; measuring energy of the electrons photo-emitted from the device, to determine the Fermi level, E f , of the device and at least one of the valence band maximum, E v , and the conduction band minimum, E c , of the device; and calculating a doping type and a doping level of the device to be at least one of p-type doping and n-type doping of the device, wherein the energy from the electrons is proportional to an energetic separation related to the doping in the device, wherein the energetic separation for p-type doping is between a valence band maximum, E v , and a Fermi level, E f , of the device, and the energetic separation for n-type doping is between a conduction band minimum, E c , and the Fermi level, E f , of the device.