Low-energy silicon allotropes with strong absorption in the visible for photovoltaic applications
|Low-energy silicon allotropes with strong absorption in the visible for photovoltaic applications
|Botti, S, Flores-Livas, JA, Amsler, M, Goedecker, S, Marques, M
|Year of Publication
|Phys. Rev. B (Rapid Comm.)
We present state-of-the-art first-principles calculations of the electronic and optical properties of silicon allotropes with interesting characteristics for applications in thin-film solar cells. These new phases consist of distorted sp3 silicon networks and have a lower formation energy than other experimentally produced silicon phases. Some of these structures turned out to have quasidirect and dipole-allowed band gaps in the range 0.8–1.5 eV, and to display absorption coefficients comparable with those of chalcopyrites used in thin-film record solar cells.