This study is driven by the need analysis methodologies based on laser/silicon the functional response of an integrated cir stimulation. It is therefore mandatory to under of elementary devices to laser illumination, in predict the behavior of more complex cir characterizes and analyses photoelectric effect 1064 nm wavelength laser on a 90 nm transistor. Comparisons between photocurren channel transistor, or in function of its sta presented. Experimental measurements are c Elements Modeling Technology Computer Aid analyses, which gives a physical insight of carr transport in the devices.