Enhanced absorption of thin-film photovoltaic cells using an optical cavity

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Weinstein L. A., HSU W., Yerci S., Boriskina S. V., CHEN G.

JOURNAL OF OPTICS, cilt.17, sa.5, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 17 Sayı: 5
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1088/2040-8978/17/5/055901
  • Dergi Adı: JOURNAL OF OPTICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: photovoltaics, light trapping, ray tracing, SOLAR-CELLS, FUNDAMENTAL LIMIT, PERFORMANCE, EFFICIENCY, COST
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

We show via numerical simulations that the absorption and solar energy conversion efficiency of a thin-film photovoltaic (PV) cell can be significantly enhanced by embedding it into an optical cavity. A reflective hemi-ellipsoid with an aperture for sunlight placed over a tilted PV cell reflects unabsorbed photons back to the cell, allowing for multiple opportunities for absorption. Ray tracing simulations predict that with the proposed cavity a textured thin-film silicon cell can exceed the Yablonovitch (Lambertian) limit for absorption across a broad wavelength range, while the performance of the cavity-embedded planar PV cell approaches that of the cell with the surface texturing.