Solar cell system using a polished concave Si-crystal mirror

Kazuo Nakajima, Keisuke Ohdaira, Kozo Fujiwara, Wugen Pan

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We demonstrated a solar cell system comprising a concave-Si-mirror solar cell and a conventional small Si solar cell set at the focal point of the concave-mirror solar cell. The concave-Si-crystal mirror was prepared by mechanically polishing a single-crystal Si wafer. It was used both as a solar cell and mirror. This system can make effective use of the photons reflected from the concave-mirror solar cell because the number of total photons is the sum of photons from both the mirror solar cell and the small solar cell set at the focal point. When the conventional small solar cell with an efficiency of 13.0% was used, the total conversion efficiency of the present system increased to 12.2% compared with the conversion efficiency of 11.5% for only the concave-Si-mirror solar cell. These results show that the present solar cell system has the capability to achieve high efficiency through the effective use of the photons reflected from conventional solar cells.

Original languageEnglish
Pages (from-to)323-329
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume88
Issue number3
DOIs
Publication statusPublished - 2005 Aug 15

Keywords

  • Focused solar beam
  • Mirror solar cells
  • Polishing
  • Reflected photons
  • Si crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

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