Tandem solar cell combining silicon and perovskites is known to be a wonderful match for efficient solar cell design. However, perovskites is suffering for its stability and silicon is supposed to be superior in nanostructure features. Therefore, in this communication, we are proposing an innovative approach to devise silicon based nanostructures fabricated from top-down strategy and combining the same with lead-free perovskite that was synthesized in ambient environment. Preliminary results confirmed successful and reproducible fabrication of silicon nanopyramids (Si-NPys) and nanowires (SiNWs). Morphology of the same nanostructures was confirmed by scanning electron microscopy. Further finite different time domain (FDTD) analysis in different solar spectrum was carried out to understand absorption depth profile, energy flux distribution, electromagnetic field localization and exciton generation rate distribution happened to be available in such nanostructures and influence in exciton generation in perovskite absorbing materials deposited atop in tandem configuration. Figure as shown below depicts the evidence of Si-NPys of Si-NWs growth using Si wafer as initial materials. It is noteworthy to mention that the dimension of such silicon nanostructures depends on experimental conditions such as temperature, precursor concentration, etching time etc. FDTD simulation suggested confined exciton generation rate distribution in such nanometric structures and thus active absorbing material such as perovskite would get enormous influence there of Authors acknowledge CoRERE, RI, KFUPM, Dhahran 31261, Saudi Arabia. MKH acknowledges Deanship of Scientific Research (DSR) at King Fahd University of Petroleum & Minerals (KFUPM) for funding this work through project No. IN151003.