First-principles design of efficient solar cells using two-dimensional arrays of core-shell and layered SiGe nanowires

Pekoz R., Malcioglu O. B. , Raty J. -.

PHYSICAL REVIEW B, cilt.83, sa.3, 2011 (SCI İndekslerine Giren Dergi) identifier identifier


Research for third generation solar cell technology has been driven by the need to overcome the efficiency and cost problems encountered by current crystalline Si- and thin-film-based solar cells. Using first-principles methods, Ge/Si and Si/Ge core/shell and Si-Ge layered nanowires are shown to possess the required qualities for an efficient use in photovoltaic applications. We investigate the details of their band structure, effective mass, absorption property, and charge-carrier localization. The strong charge separation and improved absorption in the visible spectrum indicate a remarkable quantum efficiency that, combined with new designs, compares positively with bulk Si.