Design rules for donors in bulk-heterojunction tandem solar cells-towards 15 % energy-conversion efficiency

G. Dennler, M.C. Scharber, T. Ameri, P. Denk, K. Forberich, C. Waldauf, C.J. Brabec

Research output: Contribution to journalArticlepeer-review

Abstract

The design rules for donors in bulk-heterojunction tandem solar cells-towards 15% energy-conversion efficiency was investigated. An ideal fully transparent intermediate layer placed between the sub-cells was assumed to ensure a perfect alignment of the LUMO level of the PC60BM of the bottom cell with the HOMO level of the donor of the top cell. The Voc of the tandem cell was therefore calculated as being the exact sum of the respective Voc of each sub-cell. It was observed that realizing tandem devices can be highly beneficial to enhance the performance of devices based on materials unable to deliver their full potential. It was also observed that when the donor materials employed in organic solar cells yield performance below their capabilities, tandem can be highly beneficial.
Original languageEnglish
Pages (from-to)579-583
Number of pages5
JournalAdvanced Materials
Volume20
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • Cadmium sulfide solar cells
  • Conversion efficiency
  • Cytology
  • Photovoltaic cells
  • Solar cells
  • Solar energy
  • Solar equipment
  • Volatile organic compounds
  • Bottom cells
  • Design rules
  • Intermediate layers
  • Organic solar cells
  • Performance of devices
  • Tandem cells
  • Tandem devices
  • Tandem solar cells
  • Top cells
  • Cells

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