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Knut Deppert

Knut Deppert

Professor

Knut Deppert

InP Nanowire Array Solar Cells Achieving 13.8% Efficiency by Exceeding the Ray Optics Limit.

Author

  • Jesper Wallentin
  • Nicklas Anttu
  • Damir Asoli
  • Maria Huffman
  • Ingvar Aberg
  • Martin Magnusson
  • Gerald Siefer
  • Peter Fuss-Kailuweit
  • Frank Dimroth
  • Bernd Witzigmann
  • Hongqi Xu
  • Lars Samuelson
  • Knut Deppert
  • Magnus Borgström

Summary, in English

Photovoltaics based on nanowire arrays could reduce cost and materials consumption compared to planar devices, but have exhibited low efficiency of light absorption and carrier collection. We fabricated a variety of millimeter-sized arrays of p-i-n doped InP nanowires and found that the nanowire diameter and the length of the top n-segment were critical for cell performance. Efficiencies up to 13.8% (comparable to the record planar InP cell) were achieved using resonant light trapping in 180-nanometer-diameter nanowires that only covered 12% of the surface. The share of sunlight converted into photocurrent (71%) was six times the limit in a simple ray optics description. Furthermore, the highest open circuit voltage of 0.906 volt exceeds that of its planar counterpart, despite about 30 times higher surface-to-volume ratio of the nanowire cell.

Department/s

  • Solid State Physics
  • NanoLund

Publishing year

2013

Language

English

Pages

1057-1060

Publication/Series

Science

Volume

339

Issue

6123

Document type

Journal article

Publisher

American Association for the Advancement of Science

Topic

  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1095-9203