Spectral response of solar cells determines the output performance of the devices. In this work, a 20.0% efficient silicon (Si) nano/microstructures (N/M-Strus) based solar cell with a standard solar wafer size of 156 x 156 mm(2) (pseudo-square) has been successfully fabricated, by employing the simultaneous stack SiO2/SiNx passivation for the front N/M-Strus based n(-)(+)emitter and the rear surface. The key to success lies in the excellent broadband spectral responses combining the improved short-wavelength response of the stack SiO2/SiNx passivated Si N/M-Strus based n(+)-emitter with the extraordinary long-wavelength response of the stack SiO2/SiNx passivated rear reflector. Benefiting from the broadband spectral response, the highest open-circuit voltage (V-oc) and short-circuit current density (J(sc)) reach up to 0.653 V and 39.0 mA cm(-2), respectively. This high-performance screen-printed Si N/M-Strus based solar cell has shown a very promising way to the commercial mass production of the Si based high-efficient solar cells.