In the last years, scaling down of conventional CMOS technology slowed down due to several reasons such as increase of power density and appearance of non-idealities. Molecular electronics is one emerging nanotechnology that attracted the attention of the scientific community because molecules represent the ultimate limit of miniaturization and molecular devices are potentially faster than CMOS transistors. However, a crucial problem of this technology is the too low ON current and the great process variability that affects conduction properties. The undeniable potential of molecular electronics pushed a lot of researchers to bet on this field and one of the most theoretically studied topic is the interaction between light and molecular junctions.