1. A method of forming a pixel sensor cell comprising: providing a substrate; forming an n-type collection well region in said substrate for collecting electrons generated by electromagnetic radiation impinging on said pixel sensor cell; forming an n-type diffusion region in direct physical contact with said n-type collection well region; forming a p-type collection well region in said substrate for collecting holes generated by said impinging electromagnetic radiation; forming a p-type diffusion region in direct physical contact with said p-type collection well region; and forming a circuit structure having a first input coupled to said n-type collection well region and a second input coupled to said p-type collection well region, wherein an output signal of said pixel sensor cell being the magnitude of the difference of a signal of said first input and a signal of said second input.