Optical management in perovskite/silicon tandem solar cell with nanocones array

In this paper, nanocones array is introduced into bottom silicon cells design. By finite-difference time-domain methods, the absorption efficiency in the range of 300-1100nm has been analyzed, and the structural parameters have been also optimized. Our calculations show that with the increase of the height of the nanocones, the spectra of the top cell and the bottom cell have significant interference effects, and the short wave photons and long wave photons can achieve the maximum light absorption through strict optical management.The absorption enhancement modes of photons at different wavelengths have been analyzed intuitively by the distribution of electric field. These results enable a viable and convenient route toward high efficiency design of perovskite/Si tandem solar cells.