Shifting Additionally, the impact of the PM6:Y7 blend, typically employed in photovoltaics, on the electronically tunable phase shifter under 1 sun illumination was a critical as- pect of our study, and the results are presented in Figure ). Under illumination, we observed a significant decrease in the capacitance of the phase shifter, primarily because of the increase in conductivity. This was attributed to the photo-excitation of electrons from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO), resulting in an increase in the number of free charge carriers . This increase in free charge carriers led to a substantial reduction in the overall dielectric constant of the PM6:Y7 blend, thus facilitating a more efficient conduction of electric current over the electric energy storage property 36 . Consequently, this change in the dielectric constant under illumination affects the phase shifter performance. The dependence of the phase shift on the applied voltage decreased to 16 • (FOM = 5.3 deg/dB) at 40 V under illumination, as opposed to its performance under nonilluminated conditions.