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-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 83 Sayı: 3
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1103/physrevb.83.035317
  • Dergi Adı: PHYSICAL REVIEW B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

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.